I'm running 4.4 with the pm+acpi-4.5-rc1-1 merged in. After pressing
the backlight hotkeys a couple times, things start to break. Poking
at hung thread stacks, it appears that calls to
acpi_video_handles_brightness_key_presses never return.
It appears that the culprit is:
commit aecbd9b1bff6afbe349921b406b99d285b412820
Author: Adrien Schildknecht <adrien+dev@xxxxxxxxxxx>
Date: Mon Jan 4 23:22:28 2016 +0100
ACPI / video: driver must be registered before checking for keypresses
Reverting that patch makes my laptop work again.
I don't know what that patch is trying to do, but it looks highly
questionable to me. Why should an accessor wait for a potential
different driver to register something? I see no guarantee that it
will eve happen.
This is a Dell XPS 13 9350.
--Andy
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