----- Original Message -----
Jorick Astrego píše v Čt 17. 04. 2014 v 15:40 +0200:
> On Thu, 2014-04-17 at 12:00 +0000,
> desktop-request(a)lists.fedoraproject.org wrote:
> > I've hit another annoying problem. I cannot change brightness level.
> > The
> > Fn keys don't work at all, when changing it in the user menu or
> > power
> > management settings it changes the backlight randomly in one of ten
> > attempts. Moreover indicator in the user menu always shows zero
> > level of
> > backlight.
> > I always blamed drivers or something lower in the graphics stack for
> > this. But it works perfectly in KDE and I can also change backlight
> > with
> > xbacklight or xrandr.
> > I'm using up-to-date Fedora 20+GNOME 3.12 Copr on Lenovo X240.
> > Anyone has hit the same problem?
> > BTW the more I'm using GNOME 3.12 the more I think it's not ready
> > for
> > the prime time. I'd rather wait for fixing releases.
> >
> > Jiri
> I fixed this on mij Lenovo bij adding << Option "RegistryDwords"
> "EnableBrightnessControl=1" >> to /etc/X11/xorg.conf in the
"Device"
> section:
>
> Section "Device"
> Identifier "Videocard0"
> Driver "nvidia"
> Option "RegistryDwords" "EnableBrightnessControl=1"
> EndSection
>
> Kind regards,
This didn't help. What did help, though, was adding
acpi_backlight=vendor as a boot parametr. Unfortunately, it doesn't
solve the problem completely. GNOME still doesn't remember the backlight
level from the last session and sets it to 0. So I boot into a black
screen, have to adjust it manually, log in, and adjust it manually once
again because it's set to 0 again.
As I mentioned in the upstream bug, GNOME doesn't try to remember the backlight
level, which would be why it doesn't...
The discussion will continue here:
https://bugzilla.gnome.org/show_bug.cgi?id=728354
I see no point in having to answer comments on both.
Cheers