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I would like to run the following command after every boot (or login).

echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

It turns off my discrete GPU. To what script should I add this command. I would appreciate any help.

Garips
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  • Looks about the same as the first related question: http://askubuntu.com/q/814/24102 – TLP Oct 16 '11 at 17:15

2 Answers2

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Instead of running a script you could install the package sysfsutils and add the line

kernel/debug/vgaswitcheroo/switch=OFF

to the file /etc/sysfs.conf

don_jones
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You need root privileges to run that command, so you can add it to /etc/rc.local (but before the exit 0 line) to have it run at the end of the boot process.

Otherwise you can add it to /etc/gdm/PostLogin/Default to have it run after any graphical login (when using GNOME GDM, default for Ubuntu before 11.10). If the file does not exist, just rename /etc/gdm/PostLogin/Default.sample and edit it.

Riccardo Murri
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  • i did that, but it doesn't work. I also tried to put "sleep 10" before the command, because i read somewhere it could be executed too early. do I just need to add the above mentioned line or is there more to it? – Garips Oct 16 '11 at 17:17
  • @Garips you might want to check http://en.gentoo-wiki.com/wiki/Vga_switcheroo and confirm that you have the necessary options enabled in the kernel and that the /sys/kernel/debug filesystem is mounted... – Riccardo Murri Oct 16 '11 at 17:23
  • does the /etc/gdm/PostLogin/Default work with 11.10 ? – Garips Oct 16 '11 at 17:24
  • @Garips Likely not, as 11.10 is using LightDM, not GDM – Riccardo Murri Oct 16 '11 at 17:26
  • i think the options should be enabled, otherwise the command would't work at all. but it does work when I run it manually in the terminal. – Garips Oct 16 '11 at 17:27
  • but why is the command not executed inside /etc/rc.local? Maybe I have to add something to the command. I only added the above mentioned line before the last line. and i tried to put "sleep 10" before the command. do I maybe add something to that? – Garips Oct 16 '11 at 17:29