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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@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Clinton Taylor <clinton.a.taylor@intel.com>
Signed-off-by: Harish Chegondi <harish.chegondi@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@ffwll.ch>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
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