[Bug 73882] New: no backlight after suspend to ram with modesetting Trinity [7400G]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73882

          Priority: medium
            Bug ID: 73882
          Assignee: xorg-driver-ati at lists.x.org
           Summary: no backlight after suspend to ram with modesetting
                    Trinity [7400G]
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: djtm at gmx.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/Radeon
           Product: xorg

Created attachment 92523
  --> https://bugs.freedesktop.org/attachment.cgi?id=92523&action=edit
dmesg 3.13

Everything else is still working, I can type. But there is no backlight. This
is without X running at all, kernel 3.13.

I can suspend and resume without modesetting, when I use --quirk-s3-mode and
--quirk-s3-bios *together*. I can't properly resume any other way so far
(except with fglrx).

Any hints would be very appreciated.

I've tried:

echo 1 > /sys/class/backlight/radeon_bl0/bl_power
echo 1 > /sys/class/backlight/acpi_video0/bl_power
echo 30 > /sys/class/backlight/acpi_video0/brightness
echo 30 > /sys/class/backlight/radeon_bl0/brightness

sleep 5
 vbetool dpms off
 vbetool dpms on

to no avail.

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