[Bug 108225] [LPT SPT KBP] 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 #30 from Tolga Cakir <cevelnet at gmail.com> ---
(In reply to Maarten Lankhorst from comment #24)
> Created attachment 142465 [details] [review]
> Switch backlight to PWM mode on init.
> 
> This should definitely work, but might cause a flicker during boot. Can you
> check?

I've just tested this, same setup as in comment #28. It worked the same as the
patch in comment #25. I've created a video after applying patch #24. Uploaded
on Google Drive.

fastboot=1 and patch #24:
https://drive.google.com/open?id=1UEvoKR_9vgJCuc5J4nMXRtiK0Tx8Uvo5

You can see the "blanking" behaviour I described in comment #28 at around
00:00:15. I recorded the video in a dark room with high ISO, so you can see the
backlight behaviour more clearly. As you can see, the screen never turns off.

fastboot=0 and patch #24:
https://drive.google.com/open?id=1G4kqypsQ5fmWHpDAY1ezTPPrQTzkZMDN

The screen completely turns off and on, including backlight.

Patch #25 behaves the same as patch #24. If you have further ideas, how to fix
the blanking, I'm happy to try out more patches, as I have the testing
environment setup and working.

Thanks for the patches!

Cheers,
Tolga

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