Ubuntu
gnome-power-manager package

  1. Bug #121833
  2. Comment #11

Comment 11 for bug 121833

Revision history for this message
Dana Goyette (danagoyette) wrote : Re: LCD backlight turns off between brightness levels during fades, and when on battery or at idle

Also, a note:
With the recent updates to the kernel 'video' module, gnome-power-manager, and the acpi-support scripts, my brightness keys no longer work at the kernel level. Instead, it is left up to the userspace, which renders the system unable to change brightness when in console-only mode. This also means that I have to hit the brightness keys 5 times to go between valid brightness levels; everything in the middle is entirely off.
I found a workaround for the new behavior: add 'options video no_automatic_changes=0' to some /etc/modprobe.d/ file -- this gives me the best of both worlds: I get the kernel-level brightness changing with the additional gnome OSD. *
However, either way the brightness applet isn't synced with the hotkey-changed brightness.
I also have the strange behavior when hitting 'down' while at the lowest brightness level: the LCD will alternate between low and off, with the OSD matching.

* That OSD is partly redundant on my system where I have a small, blue, BIOS-level OSD in the upper-left corner of the screen; the gnome brightness OSD is also rather ugly compared to the volume OSD.