http://bugzilla.opensuse.org/show_bug.cgi?id=1180591
http://bugzilla.opensuse.org/show_bug.cgi?id=1180591#c36
--- Comment #36 from Takashi Iwai
(In reply to Miroslav Bene�� from comment #34)
It has been a while. There is a much newer kernel version in TW now. Does the issue still persist with that? It could be the case, since it looks like a problem with BIOS or ACPI.
In fact I have just recently also started seeing this issue on Tumbleweed
It was still working about a week ago for me and now neither the xfce4-power-manager nor xbacklight are able to change screen brightness
That's weird. xfce4-power-manager should access directly /sys/class/backlight stuff (via xfpm-power-backlight-helper), at least. If changing the sysfs entry directly works, it should work, too. There seems to have had some breakage and got fixed in TW about xfce4-power-manager (bsc#1202125). Could you recheck?
# xbacklight -set 100 RANDR Query Version returned error -1
If any, this must be an issue in user-space, not kernel.
Using the method of writing to /sys with echo does work for me:
echo 378 > /sys/devices/pci0000\:00/0000\:00\:02.0/drm/card1/card1-eDP-1/intel_backlight/brightness
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