[Bug 79581] [Regression] Internal backlight brightness initially set to 0 when external display is connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79581

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
Actually, since you are only on 2.21.15, this likely to be an issue with

commit 28a057105b6974803aee0d68c2a71f322095dfde
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Jan 6 14:37:09 2014 +0000

    uxa: Disable updating properties upon reading their values

    Backport commit e76b08cad2770015346fd4cd757de3bb3b6ff37c
    Author: Chris Wilson <chris at chris-wilson.co.uk>
    Date:   Tue Oct 15 12:46:09 2013 +0100

        sna: Disable updating properties upon reading their values

    in order to prevent random screen blanking upon return from DPMS.

    Reported-by: Alexander Monakov <amonakov at gmail.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=73181
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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