[Bug 107820] [CI][DRMTIP] igt at pm_backlight@* - incomplete - system hang?

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107820

harish.chegondi at intel.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #10 from harish.chegondi at intel.com ---
The following commit has been pushed into the master branch of igt-gpu-tools


commit 8770e24fe4008404da769c16b7edac6142225ad7 (HEAD -> master)
Author: Harish Chegondi <harish.chegondi at intel.com>
Date:   Wed Apr 3 18:26:30 2019 -0700

    i915/pm_backlight: Do not turn off DPMS before system suspend

    backlight fade with suspend test turns off dpms which turns off the edp
    backlight. Then it does a system suspend and resume. After resume,
    the edp backlight would still be off, but the test sets the brightness
    value and reads it back. Since the edp backlight is off, the brightness
    values written and read are different causing the test to fail.

    Do not turn off the DPMS before suspend so that after system resume,
    the edp backlight would be on and setting the brightness value would
    be successful.

    v2: Remove "DPMS off" before system suspend instead of adding
        "DPMS on" after system resume.

    Cc: Jyoti Yadav <jyoti.r.yadav at intel.com>
    Cc: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Daniel Vetter <daniel.vetter at intel.com>
    Cc: Clinton Taylor <clinton.a.taylor at intel.com>
    Signed-off-by: Harish Chegondi <harish.chegondi at intel.com>
    References: https://bugs.freedesktop.org/show_bug.cgi?id=107820
    Fixes: 377752242995 ("Brightness test with DPMS and System suspend.")
    Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
    Reviewed-by: José Roberto de Souza <jose.souza at intel.com>

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