[Bug 415023] Re: brightness is broken on MSI WIND U100

Martin Pitt martin.pitt at ubuntu.com
Thu Oct 29 12:46:46 UTC 2009

yze [2009-10-29 12:06 -0000]:
> @steve
> echo 4 > /proc/acpi/video/IGD/DOS
> bash: /proc/acpi/video/IGD/DOS: Permission denied

That needs superuser privileges. Please try

  echo 4 | sudo tee /proc/acpi/video/IGD/DOS

If that is too magical for you, you can also do

  $ sudo -i
  # echo 4 > /proc/acpi/video/IGD/DOS

> andrew at msiu:~$ sudo echo 4 > /proc/acpi/video/IGD/DOS

This doesn't work. This only runs "echo" as root (which is
unnecessary), the ">" (output redirection) is processed by the shell
(bash) which doesn't run as root.

brightness is broken on MSI WIND U100
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