[Bug 108225] Acer V3-772G screen brightness cannot be adjusted with i915.fastboot enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108225

--- Comment #11 from Basil Eric Rabi <ericbasil.rabi at gmail.com> ---
With fastboot enabled, the screen brightness stays at maximum and can't be
adjusted by either Fn + Brightness keys (which are the left and right arrow
keys) nor with 'echo X > /sys/class/backlight/intel_backlight/brightness'. 

Using 'echo X > /sys/class/backlight/intel_backlight/brightness' changes only
the value of 'cat /sys/class/backlight/intel_backlight/brightness' but the
actual brightness of the screen stays at maximum.

After suspending and resuming (while fastboot is enabled), the backlight works
and adjusting the brightness works again. I have attached the dmesg output
after suspend/resume.

The output of 'grep -d skip "" /sys/class/backlight/intel_backlight/*' by both
fastboot enabled and disabled are the same:

/sys/class/backlight/intel_backlight/actual_brightness:489
/sys/class/backlight/intel_backlight/bl_power:0
/sys/class/backlight/intel_backlight/brightness:489
/sys/class/backlight/intel_backlight/max_brightness:4882
/sys/class/backlight/intel_backlight/type:raw

How can I do a modeset?

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