Ubuntu
hal package

  1. Bug #146710
  2. Comment #21

Comment 21 for bug 146710

Revision history for this message
bananae supremacy (landro) wrote :

The backlight keys (fn+up/dwn), the wlan switch (fn+f9) and the brightness function keys (fn+f5/f6) as well generate "unknown key" events and have not the intended effect.

Writing to /proc/acpi/video/NVID/LCD/brightness under X has no effect (see SonniesEdge).
However, this works outside of X (e.g. ctrl+alt+f1 terminal).
This is obviously a bug in the NVIDIA driver, as with the default unaccelerated driver, this problem does not occur.
The NVIDIA driver somehow blocks changes to the proc location from having any effect.