diff options
| author | David T. Sadler <davidtsadler@googlemail.com> | 2021-06-05 13:47:21 +0100 |
|---|---|---|
| committer | David T. Sadler <davidtsadler@googlemail.com> | 2021-06-05 13:47:21 +0100 |
| commit | dfb89f1877d01cf2f7d62e13725e81ecede062fb (patch) | |
| tree | b91bfa477d1fe6852be4e3b6243f6143f194e854 | |
| parent | 77e4c4c5b0811ed05ddaac8454edba006c6c273a (diff) | |
Add Xrandr: Failed to Get Size of Gamma for Output Default
| -rw-r--r-- | gemini/index.gmi | 1 | ||||
| -rw-r--r-- | gemini/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/index.gmi | 79 | ||||
| -rw-r--r-- | gemini/posts/linux/index.gmi | 1 | ||||
| -rw-r--r-- | www/index.html | 2 | ||||
| -rw-r--r-- | www/posts/atom.xml | 12 | ||||
| -rw-r--r-- | www/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/index.html | 27 | ||||
| -rw-r--r-- | www/posts/linux/atom.xml | 12 | ||||
| -rw-r--r-- | www/posts/linux/index.html | 2 | ||||
| -rw-r--r-- | www/sitemap.xml | 4 |
9 files changed, 136 insertions, 4 deletions
diff --git a/gemini/index.gmi b/gemini/index.gmi index 722f05f..ee414d1 100644 --- a/gemini/index.gmi +++ b/gemini/index.gmi @@ -4,6 +4,7 @@ Hello and welcome to my little bit of the internet where I occasionally write ab ## Latest Posts +=> /posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/ 2021-06-05 - Xrandr: Failed to Get Size of Gamma for Output Default => /posts/git/2021-05-29/setting-up-a-self-host-git-server/ 2021-05-29 - Setting up a Self Hosted Git Server => /posts/letsencrypt/2021-05-28/pre-and-post-validation-hooks-with-certbot/ 2021-05-28 - Pre and Post Validation Hooks with Certbot => /posts/letsencrypt/2021-05-27/wildcard-certificates-with-lets-encrypt/ 2021-05-27 - Wildcard Certificates with Let's Encrypt diff --git a/gemini/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/index.gmi b/gemini/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/index.gmi new file mode 100644 index 0000000..036e4e4 --- /dev/null +++ b/gemini/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/index.gmi @@ -0,0 +1,79 @@ +# Xrandr: Failed to Get Size of Gamma for Output Default + +> Sat 5th June 2021 By David T. Sadler. + +After updating a laptop to Ubuntu 20.04 I found that the resolution of the display was fixed at 1024x1028 with no option in the settings for changing it to correct resolution of 1368x768. + +Now normally I would fall back on using the xrandr command to add the missing resolution. + +First the output of cvt command gives me the VESA CVT mode lines for the resolution and refresh rate. + +```shell +$ cvt 1366 768 60 + +Modeline "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync +``` + +This mode is then added with xrandr. + +```shell +$ xrandr --newmode "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync +``` + +The mode can then be associated with the display. + +```shell +$ xrandr --addmode default 1368x768_60 +``` + +Like I said, normally this is all that is required but in this instance the xrandr command kept displaying the below message and the desired resolution would not be applied. + +```shell +xrandr: Failed to get size of gamma for output default +``` + +After several fruitless attempts at fixing this I eventually found that the nomodeset kernel boot option had been set. This instructs the kernel to not load any video drivers and instead use BIOS modes. Apparently many open source drivers have removed support for non-kernel modes and fall back to using a very basic VESA driver. I'm assuming this basic driver does not support the resolution I want. + +With further investigation I found that nomodeset was been specified via grub so removing it meant re-configuring grub by editing /etc/default/grub. + +```shell +$ sudo vim /etc/default/grub +``` + +In this file I located the below line. + +``` +GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset" +``` + +I edited this line to remove nomodeset and saved the changes. + +``` +GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" +``` + +Now all I needed to do was update grub with the new default settings. + +```shell +$ sudo update-grub +``` + +After a reboot the laptop was using the correct resolution and there was no need to use xrandr. + +### Links + +=> https://askubuntu.com/questions/207175/what-does-nomodeset-do askubuntu/ question regarding nomodeset does. + +=> /posts/linux/ Linux - Read More Posts. + +I don't have comments as I don't want to manage them. You can however contact me at the below address if you want to. + +=> mailto:david@davidtsadler.com Email david@davidtsadler.com + +### License + +=> https://creativecommons.org/licenses/by-sa/4.0/ The contents of this site is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. + +Copyright © 2021 David T. Sadler. + +=> / Return to Homepage. diff --git a/gemini/posts/linux/index.gmi b/gemini/posts/linux/index.gmi index 0c0c0ab..88e7e84 100644 --- a/gemini/posts/linux/index.gmi +++ b/gemini/posts/linux/index.gmi @@ -1,5 +1,6 @@ # The Home of David T. Sadler - All Posts About Linux +=> /posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/ 2021-06-05 - Xrandr: Failed to Get Size of Gamma for Output Default => /posts/linux/2020-07-13/sudo-sorry-you-must-have-a-tty-to-run-sudo/ 2020-07-13 - Sudo: sorry, you must have a tty to run sudo ### License diff --git a/www/index.html b/www/index.html index a66f580..b2c8d42 100644 --- a/www/index.html +++ b/www/index.html @@ -18,7 +18,7 @@ <link href="/posts/php/atom.xml" type="application/atom+xml" rel="alternate" title="The Home of David T. Sadler - All Posts About PHP"/> </head> <body> - <section><h1>The Home of David T. Sadler</h1><p>Hello and welcome to my little bit of the internet where I occasionally write about things that interest me. You might find my posts interesting or you might not and that's okay.</p><h2>Latest Posts</h2><a href="/posts/git/2021-05-29/setting-up-a-self-host-git-server/">2021-05-29 - Setting up a Self Hosted Git Server</a><a href="/posts/letsencrypt/2021-05-28/pre-and-post-validation-hooks-with-certbot/">2021-05-28 - Pre and Post Validation Hooks with Certbot</a><a href="/posts/letsencrypt/2021-05-27/wildcard-certificates-with-lets-encrypt/">2021-05-27 - Wildcard Certificates with Let's Encrypt</a><a href="/posts/nextcloud/2021-02-15/accessing-nextcloud-with-webdav-on-arch/">2021-02-15 - Accessing Nextcloud With WebDAV on Arch</a><a href="/posts/gemini/2021-02-08/how-to-host-your-own-gemini-site-in-the-cloud/">2021-02-08 - How to Host Your Own Gemini Site in the Cloud</a><a href="/posts/php/2021-01-18/installing-php-8-for-windows-10/">2021-01-18 - Installing PHP 8 for Windows 10</a><a href="/posts/laravel/2020-12-21/installing-laravel-homestead-in-arch-linux/">2020-12-21 - Installing Laravel Homestead in Arch Linux</a><a href="/posts/laravel/2020-12-14/sqlstate-hy000-2002-php-network-getaddresses-getaddrinfo-failed/">2020-12-14 - SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed</a><a href="/posts/arch/2020-09-07/installing-zsh-and-powerlevel10k-on-arch-linux/">2020-09-07 - Installing Zsh and Powerlevel10k on Arch Linux</a><a href="/posts/arch/2020-08-31/enabling-audio-in-arch-linux/">2020-08-31 - Enabling Audio in Arch Linux</a><a href="/posts/arch/2020-08-24/pacman-cheat-sheet-for-ubuntu-users/">2020-08-24 - Pacman Cheat Sheet For Ubuntu Users</a><a href="/posts/arch/2020-08-17/installing-st-dmenu-dwm-in-arch-linux/">2020-08-17 - Installing ST, DMENU and DWM in Arch Linux</a><a href="/posts/linux/2020-07-13/sudo-sorry-you-must-have-a-tty-to-run-sudo/">2020-07-13 - Sudo: sorry, you must have a tty to run sudo</a><a href="/posts/arch/2020-06-22/granting-sudo-access-to-a-user-in-arch-linux/">2020-06-22 - Granting Sudo Access to a User in Arch Linux</a><a href="/posts/arch/2020-06-15/adding-a-user-in-arch-linux/">2020-06-15 - Adding a User in Arch Linux</a><a href="/posts/netlify/2020-06-08/publishing-jigsaw-posts-with-netlify-build-hooks/">2020-06-08 - Publishing Jigsaw Posts With Netlify Build Hooks</a><a href="/posts/jigsaw/2020-06-01/scheduling-posts-in-jigsaw/">2020-06-01 - Scheduling Posts in Jigsaw</a><a href="/posts/arch/2020-05-25/installing-arch-linux-on-a-thinkpad-x220/">2020-05-25 - Installing Arch Linux on a Thinkpad X220</a><a href="/posts/markdown/2020-03-30/creating-an-ebook-with-markdown/">2020-03-30 - Creating an Ebook With Markdown</a><h2>All Posts</h2><a href="/posts/">Post Archive</a><h2>Tags</h2><a href="/posts/arch/">Arch</a><a href="/posts/gemini/">Gemini</a><a href="/posts/git/">Git</a><a href="/posts/jigsaw/">Jigsaw</a><a href="/posts/laravel/">Laravel</a><a href="/posts/letsencrypt/">Let's Encrypt</a><a href="/posts/linux/">Linux</a><a href="/posts/markdown/">Markdown</a><a href="/posts/netlify/">Netlify</a><a href="/posts/nextcloud/">Nextcloud</a><a href="/posts/php/">PHP</a><h2>Where to Find Me</h2><a href="https://github.com/davidtsadler/">GitHub</a><a href="gemini://davidtsadler.com/">Gemini Site</a><a href="mailto:david@davidtsadler.com">Email david@davidtsadler.com</a><h3>License</h3><a href="https://creativecommons.org/licenses/by-sa/4.0/">The contents of this site is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.</a><p>Copyright © 2021 David T. Sadler.</p></section> + <section><h1>The Home of David T. Sadler</h1><p>Hello and welcome to my little bit of the internet where I occasionally write about things that interest me. You might find my posts interesting or you might not and that's okay.</p><h2>Latest Posts</h2><a href="/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/">2021-06-05 - Xrandr: Failed to Get Size of Gamma for Output Default</a><a href="/posts/git/2021-05-29/setting-up-a-self-host-git-server/">2021-05-29 - Setting up a Self Hosted Git Server</a><a href="/posts/letsencrypt/2021-05-28/pre-and-post-validation-hooks-with-certbot/">2021-05-28 - Pre and Post Validation Hooks with Certbot</a><a href="/posts/letsencrypt/2021-05-27/wildcard-certificates-with-lets-encrypt/">2021-05-27 - Wildcard Certificates with Let's Encrypt</a><a href="/posts/nextcloud/2021-02-15/accessing-nextcloud-with-webdav-on-arch/">2021-02-15 - Accessing Nextcloud With WebDAV on Arch</a><a href="/posts/gemini/2021-02-08/how-to-host-your-own-gemini-site-in-the-cloud/">2021-02-08 - How to Host Your Own Gemini Site in the Cloud</a><a href="/posts/php/2021-01-18/installing-php-8-for-windows-10/">2021-01-18 - Installing PHP 8 for Windows 10</a><a href="/posts/laravel/2020-12-21/installing-laravel-homestead-in-arch-linux/">2020-12-21 - Installing Laravel Homestead in Arch Linux</a><a href="/posts/laravel/2020-12-14/sqlstate-hy000-2002-php-network-getaddresses-getaddrinfo-failed/">2020-12-14 - SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed</a><a href="/posts/arch/2020-09-07/installing-zsh-and-powerlevel10k-on-arch-linux/">2020-09-07 - Installing Zsh and Powerlevel10k on Arch Linux</a><a href="/posts/arch/2020-08-31/enabling-audio-in-arch-linux/">2020-08-31 - Enabling Audio in Arch Linux</a><a href="/posts/arch/2020-08-24/pacman-cheat-sheet-for-ubuntu-users/">2020-08-24 - Pacman Cheat Sheet For Ubuntu Users</a><a href="/posts/arch/2020-08-17/installing-st-dmenu-dwm-in-arch-linux/">2020-08-17 - Installing ST, DMENU and DWM in Arch Linux</a><a href="/posts/linux/2020-07-13/sudo-sorry-you-must-have-a-tty-to-run-sudo/">2020-07-13 - Sudo: sorry, you must have a tty to run sudo</a><a href="/posts/arch/2020-06-22/granting-sudo-access-to-a-user-in-arch-linux/">2020-06-22 - Granting Sudo Access to a User in Arch Linux</a><a href="/posts/arch/2020-06-15/adding-a-user-in-arch-linux/">2020-06-15 - Adding a User in Arch Linux</a><a href="/posts/netlify/2020-06-08/publishing-jigsaw-posts-with-netlify-build-hooks/">2020-06-08 - Publishing Jigsaw Posts With Netlify Build Hooks</a><a href="/posts/jigsaw/2020-06-01/scheduling-posts-in-jigsaw/">2020-06-01 - Scheduling Posts in Jigsaw</a><a href="/posts/arch/2020-05-25/installing-arch-linux-on-a-thinkpad-x220/">2020-05-25 - Installing Arch Linux on a Thinkpad X220</a><a href="/posts/markdown/2020-03-30/creating-an-ebook-with-markdown/">2020-03-30 - Creating an Ebook With Markdown</a><h2>All Posts</h2><a href="/posts/">Post Archive</a><h2>Tags</h2><a href="/posts/arch/">Arch</a><a href="/posts/gemini/">Gemini</a><a href="/posts/git/">Git</a><a href="/posts/jigsaw/">Jigsaw</a><a href="/posts/laravel/">Laravel</a><a href="/posts/letsencrypt/">Let's Encrypt</a><a href="/posts/linux/">Linux</a><a href="/posts/markdown/">Markdown</a><a href="/posts/netlify/">Netlify</a><a href="/posts/nextcloud/">Nextcloud</a><a href="/posts/php/">PHP</a><h2>Where to Find Me</h2><a href="https://github.com/davidtsadler/">GitHub</a><a href="gemini://davidtsadler.com/">Gemini Site</a><a href="mailto:david@davidtsadler.com">Email david@davidtsadler.com</a><h3>License</h3><a href="https://creativecommons.org/licenses/by-sa/4.0/">The contents of this site is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.</a><p>Copyright © 2021 David T. Sadler.</p></section> <script defer src="/js/highlight.min.js"></script> <script defer src="/js/site.js"></script> </body> diff --git a/www/posts/atom.xml b/www/posts/atom.xml index 77f6e47..db529ef 100644 --- a/www/posts/atom.xml +++ b/www/posts/atom.xml @@ -4,8 +4,18 @@ <id>https://davidtsadler.com/posts/atom.xml</id> <link rel="alternate" type="text/html" href="https://davidtsadler.com/posts/index.html"/> <link rel="self" type="application/atom+xml" href="https://davidtsadler.com/posts/atom.xml"/> - <updated>2021-05-29T12:00:00Z</updated> + <updated>2021-06-05T12:00:00Z</updated> <entry> + <title type="text">Xrandr: Failed to Get Size of Gamma for Output Default</title> + <id>https://davidtsadler.com/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/index.html</id> + <link rel="alternate" type="text/html" href="https://davidtsadler.com/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/index.html"/> + <author><name>David T. Sadler.</name></author> + <published>2021-06-05T12:00:00Z</published> + <updated>2021-06-05T12:00:00Z</updated> + <content type="html"><h1>Xrandr: Failed to Get Size of Gamma for Output Default</h1><blockquote>Sat 5th June 2021 By David T. Sadler.</blockquote><p>After updating a laptop to Ubuntu 20.04 I found that the resolution of the display was fixed at 1024x1028 with no option in the settings for changing it to correct resolution of 1368x768.</p><p>Now normally I would fall back on using the xrandr command to add the missing resolution.</p><p>First the output of cvt command gives me the VESA CVT mode lines for the resolution and refresh rate.</p><pre><code class="shell">$ cvt 1366 768 60 + +Modeline &quot;1368x768_60.00&quot; 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync</code></pre><p>This mode is then added with xrandr.</p><pre><code class="shell">$ xrandr --newmode &quot;1368x768_60.00&quot; 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync</code></pre><p>The mode can then be associated with the display.</p><pre><code class="shell">$ xrandr --addmode default 1368x768_60</code></pre><p>Like I said, normally this is all that is required but in this instance the xrandr command kept displaying the below message and the desired resolution would not be applied.</p><pre><code class="shell">xrandr: Failed to get size of gamma for output default</code></pre><p>After several fruitless attempts at fixing this I eventually found that the nomodeset kernel boot option had been set. This instructs the kernel to not load any video drivers and instead use BIOS modes. Apparently many open source drivers have removed support for non-kernel modes and fall back to using a very basic VESA driver. I'm assuming this basic driver does not support the resolution I want.</p><p>With further investigation I found that nomodeset was been specified via grub so removing it meant re-configuring grub by editing /etc/default/grub.</p><pre><code class="shell">$ sudo vim /etc/default/grub</code></pre><p>In this file I located the below line.</p><pre>GRUB_CMDLINE_LINUX_DEFAULT=&quot;quiet splash nomodeset&quot;</pre><p>I edited this line to remove nomodeset and saved the changes.</p><pre>GRUB_CMDLINE_LINUX_DEFAULT=&quot;quiet splash&quot;</pre><p>Now all I needed to do was update grub with the new default settings.</p><pre><code class="shell">$ sudo update-grub</code></pre><p>After a reboot the laptop was using the correct resolution and there was no need to use xrandr.</p><h3>Links</h3><a href="https://askubuntu.com/questions/207175/what-does-nomodeset-do">askubuntu/ question regarding nomodeset does.</a><a href="/posts/linux/">Linux - Read More Posts.</a><p>I don't have comments as I don't want to manage them. You can however contact me at the below address if you want to.</p><a href="mailto:david@davidtsadler.com">Email david@davidtsadler.com</a><h3>License</h3><a href="https://creativecommons.org/licenses/by-sa/4.0/">The contents of this site is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.</a><p>Copyright © 2021 David T. Sadler.</p><a href="/">Return to Homepage.</a></content> +</entry><entry> <title type="text">Setting up a Self Hosted Git Server</title> <id>https://davidtsadler.com/posts/git/2021-05-29/setting-up-a-self-host-git-server/index.html</id> <link rel="alternate" type="text/html" href="https://davidtsadler.com/posts/git/2021-05-29/setting-up-a-self-host-git-server/index.html"/> diff --git a/www/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/index.html b/www/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/index.html new file mode 100644 index 0000000..3720159 --- /dev/null +++ b/www/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/index.html @@ -0,0 +1,27 @@ +<!doctype html> +<html lang="en"> + <head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <title>Xrandr: Failed to Get Size of Gamma for Output Default</title> + <link rel="shortcut icon" href="/images/favicon.png"> + <link rel="stylesheet" href="/css/site.css"> + <link href="/posts/atom.xml" type="application/atom+xml" rel="alternate" title="The Home of David T. Sadler - All Posts"/> + <link href="/posts/arch/atom.xml" type="application/atom+xml" rel="alternate" title="The Home of David T. Sadler - All Posts About Arch"/> + <link href="/posts/gemini/atom.xml" type="application/atom+xml" rel="alternate" title="The Home of David T. Sadler - All Posts About Gemini"/> + <link href="/posts/jigsaw/atom.xml" type="application/atom+xml" rel="alternate" title="The Home of David T. Sadler - All Posts About Jigsaw"/> + <link href="/posts/laravel/atom.xml" type="application/atom+xml" rel="alternate" title="The Home of David T. Sadler - All Posts About Laravel"/> + <link href="/posts/linux/atom.xml" type="application/atom+xml" rel="alternate" title="The Home of David T. Sadler - All Posts About Linux"/> + <link href="/posts/markdown/atom.xml" type="application/atom+xml" rel="alternate" title="The Home of David T. Sadler - All Posts About Markdown"/> + <link href="/posts/netlify/atom.xml" type="application/atom+xml" rel="alternate" title="The Home of David T. Sadler - All Posts About Netlify"/> + <link href="/posts/nextcloud/atom.xml" type="application/atom+xml" rel="alternate" title="The Home of David T. Sadler - All Posts About Nextcloud"/> + <link href="/posts/php/atom.xml" type="application/atom+xml" rel="alternate" title="The Home of David T. Sadler - All Posts About PHP"/> + </head> + <body> + <section><h1>Xrandr: Failed to Get Size of Gamma for Output Default</h1><blockquote>Sat 5th June 2021 By David T. Sadler.</blockquote><p>After updating a laptop to Ubuntu 20.04 I found that the resolution of the display was fixed at 1024x1028 with no option in the settings for changing it to correct resolution of 1368x768.</p><p>Now normally I would fall back on using the xrandr command to add the missing resolution.</p><p>First the output of cvt command gives me the VESA CVT mode lines for the resolution and refresh rate.</p><pre><code class="shell">$ cvt 1366 768 60 + +Modeline "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync</code></pre><p>This mode is then added with xrandr.</p><pre><code class="shell">$ xrandr --newmode "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync</code></pre><p>The mode can then be associated with the display.</p><pre><code class="shell">$ xrandr --addmode default 1368x768_60</code></pre><p>Like I said, normally this is all that is required but in this instance the xrandr command kept displaying the below message and the desired resolution would not be applied.</p><pre><code class="shell">xrandr: Failed to get size of gamma for output default</code></pre><p>After several fruitless attempts at fixing this I eventually found that the nomodeset kernel boot option had been set. This instructs the kernel to not load any video drivers and instead use BIOS modes. Apparently many open source drivers have removed support for non-kernel modes and fall back to using a very basic VESA driver. I'm assuming this basic driver does not support the resolution I want.</p><p>With further investigation I found that nomodeset was been specified via grub so removing it meant re-configuring grub by editing /etc/default/grub.</p><pre><code class="shell">$ sudo vim /etc/default/grub</code></pre><p>In this file I located the below line.</p><pre>GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"</pre><p>I edited this line to remove nomodeset and saved the changes.</p><pre>GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"</pre><p>Now all I needed to do was update grub with the new default settings.</p><pre><code class="shell">$ sudo update-grub</code></pre><p>After a reboot the laptop was using the correct resolution and there was no need to use xrandr.</p><h3>Links</h3><a href="https://askubuntu.com/questions/207175/what-does-nomodeset-do">askubuntu/ question regarding nomodeset does.</a><a href="/posts/linux/">Linux - Read More Posts.</a><p>I don't have comments as I don't want to manage them. You can however contact me at the below address if you want to.</p><a href="mailto:david@davidtsadler.com">Email david@davidtsadler.com</a><h3>License</h3><a href="https://creativecommons.org/licenses/by-sa/4.0/">The contents of this site is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.</a><p>Copyright © 2021 David T. Sadler.</p><a href="/">Return to Homepage.</a></section> + <script defer src="/js/highlight.min.js"></script> + <script defer src="/js/site.js"></script> + </body> +</html> diff --git a/www/posts/linux/atom.xml b/www/posts/linux/atom.xml index c3dc7ef..febc9d2 100644 --- a/www/posts/linux/atom.xml +++ b/www/posts/linux/atom.xml @@ -4,8 +4,18 @@ <id>https://davidtsadler.com/posts/linux/atom.xml</id> <link rel="alternate" type="text/html" href="https://davidtsadler.com/posts/linux/index.html"/> <link rel="self" type="application/atom+xml" href="https://davidtsadler.com/posts/linux/atom.xml"/> - <updated>2020-07-13T12:00:00Z</updated> + <updated>2021-06-05T12:00:00Z</updated> <entry> + <title type="text">Xrandr: Failed to Get Size of Gamma for Output Default</title> + <id>https://davidtsadler.com/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/index.html</id> + <link rel="alternate" type="text/html" href="https://davidtsadler.com/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/index.html"/> + <author><name>David T. Sadler.</name></author> + <published>2021-06-05T12:00:00Z</published> + <updated>2021-06-05T12:00:00Z</updated> + <content type="html"><h1>Xrandr: Failed to Get Size of Gamma for Output Default</h1><blockquote>Sat 5th June 2021 By David T. Sadler.</blockquote><p>After updating a laptop to Ubuntu 20.04 I found that the resolution of the display was fixed at 1024x1028 with no option in the settings for changing it to correct resolution of 1368x768.</p><p>Now normally I would fall back on using the xrandr command to add the missing resolution.</p><p>First the output of cvt command gives me the VESA CVT mode lines for the resolution and refresh rate.</p><pre><code class="shell">$ cvt 1366 768 60 + +Modeline &quot;1368x768_60.00&quot; 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync</code></pre><p>This mode is then added with xrandr.</p><pre><code class="shell">$ xrandr --newmode &quot;1368x768_60.00&quot; 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync</code></pre><p>The mode can then be associated with the display.</p><pre><code class="shell">$ xrandr --addmode default 1368x768_60</code></pre><p>Like I said, normally this is all that is required but in this instance the xrandr command kept displaying the below message and the desired resolution would not be applied.</p><pre><code class="shell">xrandr: Failed to get size of gamma for output default</code></pre><p>After several fruitless attempts at fixing this I eventually found that the nomodeset kernel boot option had been set. This instructs the kernel to not load any video drivers and instead use BIOS modes. Apparently many open source drivers have removed support for non-kernel modes and fall back to using a very basic VESA driver. I'm assuming this basic driver does not support the resolution I want.</p><p>With further investigation I found that nomodeset was been specified via grub so removing it meant re-configuring grub by editing /etc/default/grub.</p><pre><code class="shell">$ sudo vim /etc/default/grub</code></pre><p>In this file I located the below line.</p><pre>GRUB_CMDLINE_LINUX_DEFAULT=&quot;quiet splash nomodeset&quot;</pre><p>I edited this line to remove nomodeset and saved the changes.</p><pre>GRUB_CMDLINE_LINUX_DEFAULT=&quot;quiet splash&quot;</pre><p>Now all I needed to do was update grub with the new default settings.</p><pre><code class="shell">$ sudo update-grub</code></pre><p>After a reboot the laptop was using the correct resolution and there was no need to use xrandr.</p><h3>Links</h3><a href="https://askubuntu.com/questions/207175/what-does-nomodeset-do">askubuntu/ question regarding nomodeset does.</a><a href="/posts/linux/">Linux - Read More Posts.</a><p>I don't have comments as I don't want to manage them. You can however contact me at the below address if you want to.</p><a href="mailto:david@davidtsadler.com">Email david@davidtsadler.com</a><h3>License</h3><a href="https://creativecommons.org/licenses/by-sa/4.0/">The contents of this site is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.</a><p>Copyright © 2021 David T. Sadler.</p><a href="/">Return to Homepage.</a></content> +</entry><entry> <title type="text">Sudo: sorry, you must have a tty to run sudo</title> <id>https://davidtsadler.com/posts/linux/2020-07-13/sudo-sorry-you-must-have-a-tty-to-run-sudo/index.html</id> <link rel="alternate" type="text/html" href="https://davidtsadler.com/posts/linux/2020-07-13/sudo-sorry-you-must-have-a-tty-to-run-sudo/index.html"/> diff --git a/www/posts/linux/index.html b/www/posts/linux/index.html index 939dbec..34cc415 100644 --- a/www/posts/linux/index.html +++ b/www/posts/linux/index.html @@ -18,7 +18,7 @@ <link href="/posts/php/atom.xml" type="application/atom+xml" rel="alternate" title="The Home of David T. Sadler - All Posts About PHP"/> </head> <body> - <section><h1>The Home of David T. Sadler - All Posts About Linux</h1><a href="/posts/linux/2020-07-13/sudo-sorry-you-must-have-a-tty-to-run-sudo/">2020-07-13 - Sudo: sorry, you must have a tty to run sudo</a><h3>License</h3><a href="https://creativecommons.org/licenses/by-sa/4.0/">The contents of this site is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.</a><p>Copyright © 2021 David T. Sadler.</p><a href="/">Return to Homepage.</a></section> + <section><h1>The Home of David T. Sadler - All Posts About Linux</h1><a href="/posts/linux/2021-06-05/xrandr-failed-to-get-size-of-gamma-for-output-default/">2021-06-05 - Xrandr: Failed to Get Size of Gamma for Output Default</a><a href="/posts/linux/2020-07-13/sudo-sorry-you-must-have-a-tty-to-run-sudo/">2020-07-13 - Sudo: sorry, you must have a tty to run sudo</a><h3>License</h3><a href="https://creativecommons.org/licenses/by-sa/4.0/">The contents of this site is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.</a><p>Copyright © 2021 David T. 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