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Hello,
I was using Arch for quite some time on a Lenovo T61 and these days I installed Arch with Plasma on a Lenovo T540p with Intel only graphics. I managed to get almost anything to work so far except the behaviour of the display brightness:
After a reboot the brightness indicator responds to the according key presses, but the brightness doesn't change. Also the value in /sys/class/backlight/intel_backlight/brightness changes as I'd expect. Bringing the value to 0 makes it dark, but anything else results in full brightness.
After closing and re-opening the Laptop lid the brightness indicator and /sys/class/backlight/intel_backlight/brightness seem to behave like before, but now the brightness really changes.
I already passed acpi_osi=linux and acpi_backlight=video/vendor/native to the kernel but without any effect.
I tried adding Option "Backlight" "intel_backlight" to /etc/X11/xorg.conf.d/20-intel.conf but this also didn't help.
My /etc/modprobe.d/i915.conf contains
options i915 fastboot=1
options i915 enable_gvt=1
# don't load the nVidia driver
blacklist nouveau
What else could I try to get that working?
SOLUTION:
options i915 fastboot=1
leads to this behaviour. After removing it from /etc/modprobe.d/i915.conf everything works as expected.
Last edited by myscha (2018-12-19 21:31:53)
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