Xbacklight broken by Intel fastboot?

Support Linux Support
1

I have installed arch linux on my Acer311 Bobba and am facing an issue with backlight controls. I can control it by manually writing to /sys/class/backlight/intel_backlight/brightness, but trying to use xbacklight gives me an error: No outputs have backlight property.

The arch wiki page on backlight says this can be fixed by creating a /etc/X11/xorg.conf.d/20-intel.conf, but adding such a file causes lightdm to crash on start, which wiki says is a bug related to Intel fastboot and recommends to disable it in BIOS.

I have looked throughout the BIOS settings but cannot find anything related to fastboot, the only advances setting is secure boot. I tried creating /etc/modprobe.d/i915.conf with options i915 fastboot=0 but it does not help.

2

Intel Fastboot, as the Arch wiki entry explains, is a kernel driver option, not a BIOS one

3

Thank you for reply. I was asking about BIOS, because on e.g. Intel NUC it can be disabled via BIOS. Do you happen to know how it can be disabled via kernel? I cannot quite parse arch wiki page on fastboot, but it seems to imply it is always enabled as of 6.9 and the i915.fastboot flag can only enable it, not disable.

4

where are you getting this from? Nothing to do with firmware.