Public bug reported:
My laptop (Dell Studio 1535) is able to control display brightness by
itself - it remembers brightness settings for states running on
battery/AC power. When I disconnect AC power, it dims display
automaticaly to state where I left it on battery, if I connect it again,
it adjust the brightness where I left it on AC power.
Problem is that ubuntu messes it up - it tends to adjust the brightness
by itself then and it always switches brightness in a wrong way, not to
the level I left it.
Brightness is adjusted even on boot - during xsplash, before login is
shown, it sets brightness to maximum, when I dim it e.g. to the minimum
and then log in, it is again adjusted to the maximum.
There is a way to turn software dimming off in gnome-power-manager, but
it has no effect during the boot and after loging in, it is only
respected when I connect/disconnect AC when already logged in.
As software dimming is absolutely useless when laptop itself can control
it, there really should be some kind of laptops "whitelist" for which it
would be turned off by default and/or there should be an option to turn
it off completly even during the boot.
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: ubuntu-boot-experience
** Tags added: ubuntu-boot-experience
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[karmic] annoying software brightness changes
https://bugs.launchpad.net/bugs/441191
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