[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 #7 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Basil Eric Rabi from comment #0)
> Created attachment 141889 [details]
> dmesg with no fastboot and with fastboot using drm.debug=0x1e

I'd like to see full dmesg from boot, i.e. add log_buf_len=4M or similar and
attach dmesg command output. Keep the drm.debug option.

What does this print for each case after booting:

$ grep -d skip "" /sys/class/backlight/intel_backlight/*

> When booting with the option i915.fastboot=1 in command line, the screen
> brightness of Acer V3-772G laptop cannot be adjusted. When fastboot option
> is removed, the screen brightness can be adjusted without issues.

What do you mean brightness can't be adjusted? Please be more elaborate. Please
try the sysfs interface directly, 'echo X >
/sys/class/backlight/intel_backlight/brightness' where X is some number between
0 and max_brightness.

Does the backlight start working after a suspend/resume or a modeset?

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