Ubuntu
linux package

  1. Bug #333386
  2. Comment #50

Comment 50 for bug 333386

Revision history for this message
Stefan Bader (smb) wrote : Re: [Bug 333386] Re: Cannot change brightness with 2.6.27-11+ kernel

I am currently travelling, so responses can be slow.

> cat /sys/devices/platform/acer-wmi/interface:
> WMID
>
Thanks, so that rules out the other interfaces.

> How to test which sysfs interface is working? i'll download a liveCD and try...
>

When, using the Intrepid liveCD, brightness control works from the GUI, try to
echo values into the /sys/.../acer-wmi/brightness file. If that changes the
screen brightness as well, then this proves that the acpi wmi interface has
broken at least for these acer laptops.