Ubuntu
gnome-power-manager package

  1. Bug #121833
  2. Comment #12

Comment 12 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

Oh great, now my workaround has been broken, too! Now I have to press the brightness keys FIVE times to go between adjacent brightness levels -- and some levels are still missing! I can't, for example, use the levels 12, 37, 62, or 87, despite those levels working when I directly manipulate the backlight sysfs entries.

This is the change that re-broke
hal (0.5.9.1-1ubuntu9) gutsy; urgency=low

  * debian/patches/64_read_brightness_not_actual_brightness.patch: Read
    the brightness from /sys/class/backlight/foo/brightness, not
    actual_brightness. It makes more sense to change based on the
    brightness that we wanted to set, not the brightness that we
    actually set.

Where's the logic in that? You should show the actual brightness, not what you asked for! Try applying the "act based on what we asked for, not what we got" logic to everyday situations, and see how well it works...

Having no_automatic_changes=0 now results in my screen BLINKING every time I press a brightness key, as the DSDT changes brightness to the right level, and then gnome-power-manager stupidly changes it back to an invalid value. Starting from 100%, it's like this:
100%, BLINK, BLINK, BLINK, BLINK, 75%, BLINK, BLINK, BLINK, BLINK, 50%, BLINK, BLINK, BLINK, BLINK, 25%, BLINK, BLINK, BLINK, BLINK, 0%.