Ubuntu
gnome-settings-daemon package

  1. Bug #896595
  2. Comment #18

Comment 18 for bug 896595

Revision history for this message
Jingguo Yao (yaojingguo) wrote : Re: Ubuntu does not remember LID brightness

After recovering from screen dimming, the brightness is set set maximum for my case. For this problem, I follow the instructions in https://wiki.ubuntu.com/Kernel/Debugging/Backlight. After adding "acpi_backlight=vendor" kernel parameter, the problem is fixed.

But during the boot of Ubuntu, I still get the following error message:

thinkpad_acpi: Unsupported brightness interface, please contact <email address hidden>.

I am using Ubuntu 14.04 64 bit with a Thinkpad T440S.