On 19-01-17 16:14, Martin Ueding wrote:
Am 16.01.2017 um 17:18 schrieb Kevin Fenzi:
> Did xbacklight work in the past?
Yes, it did.
To work around that bug, I use KDE Plasma and there I can change the
brightness with Fn+PgUp. `xbacklight` does not work there, saying that
no output have backlight property.
Yes that is an expected result of switching to the modesetting driver,
the intel ddx is the only driver which ever implemented a xrandr backlight
property, non of the others (ati, nouveau) have ever offered this, so
most tools simply write directly to /sys/class/backlight, but xbacklight
relies on the xrandr property (and is the only tool do so AFAICT).
Maybe someone should look into making xbacklight access the sysfs
interface directly like gnome, kde and xfce are doing. This does
require root rights, a patch for this could re-use the
See xf86-video-intel/src/backlight.c for how to use this.