[Bug 83331] New: radeon: Laptop panel out of sync after dpms standby/suspend/off

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=83331

            Bug ID: 83331
           Summary: radeon: Laptop panel out of sync after dpms
                    standby/suspend/off
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.15.10
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: klaus.kusche at computerix.info
        Regression: No

I've a problem on my laptop
(Dell Precision M6700 with AMD Cap Verde graphics, ChipID = 0x6825)
with the radeon driver (radeon-ucode-20140430):

Whenever the X server switches to dpms standby, suspend or off state
(it does so after 5 minutes when I'm on battery and idle)
and then back to dpms on, the internal panel is out of sync:
It is completely unreadable, flashes or shows strange moving patterns.
External displays are fine.
The problem is independent of the radeon powersave mode
(profile or dpm).

The only way to recover is either to power cycle
or to blindly type
xrandr --output eDP --off
xrandr --output eDP --auto

Switching from X to a text (framebuffer) VT does not help:
They are also corrupted.

When initializing radeon during boot, the kernel log says
radeon 0000:01:00.0: Invalid ROM contents
Could that be related?
Everything else looks fine.
When the problem happens, nothing is written to the kernel log.

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