Power and brightness issue

[Adam Williamson]

On Sun, 2011-07-31 at 15:37 -0300, Sergio Belkin wrote:
> I've read http://fedoraproject.org/wiki/Bugs/Common#Laptop_screen_dims_when_switching_to_battery_power_or_idle_mode_but_never_brightens_again
> 
> My system suffers the same symptoms but I use KDE. So it seems that is
> not GNOME restricted.
> 
> 
> Using F15 on x86_64
> 
> cat /sys/module/pcie_aspm/parameters/policy
> default performance [powersave]
> 
> any ideas?

That bug certainly was GNOME specific: it was a bug in
gnome-power-manager 's logic. There's no way that specific bug could
affect KDE, unless somehow you're running g-p-m in KDE. If you're seeing
a similar issue in KDE, it must track down to a different bug, so please
file it. Be aware, though, that the display dimming somewhat when you
disconnect the AC power is 'normal': both KDE and GNOME do this to save
battery power. The bug in this case was that when you re-connected to AC
the brightness did not increase again, but if you then disconnected from
AC once more the brightness would decrease further - so you got stuck in
a descending spiral of darkness until the screen was stuck at its lowest
possible brightness setting until you adjusted it manually or rebooted.
If the screen dims somewhat (to, say, 50%) when you unplug, goes back up
to 100% when you plug back in, then dims back to 50% when you unplug
again, that's intended behaviour and not a bug (though if you don't like
it, it's configurable).
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | identi.ca: adamwfedora
http://www.happyassassin.net