[Bug 112781] New: radeon: f95429e "only init fbdev if we have connectors" breaks suspend on Clevo P170EM laptop

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=112781

            Bug ID: 112781
           Summary: radeon: f95429e "only init fbdev if we have
                    connectors" breaks suspend on Clevo P170EM laptop
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.5-rc2
          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: haagch.christoph at googlemail.com
        Regression: No

Created attachment 204201
  --> https://bugzilla.kernel.org/attachment.cgi?id=204201&action=edit
dmesg

On a Clevo P170EM with these GPUs:

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Wimbledon XT [Radeon HD 7970M] (rev ff)

With rc2 suspend stopped working. It starts to suspend, turns off the display,
etc., but then it fails to actually enter the suspend state. The power stays on
and after a while the radeon GPU fan starts spinning up. There's nothing in the
logs relating to the problem I could find.

I bisected to f95429eccc570dc45d589c327bfcfddcdc3e8228 and confirmed it with
latest linux git (4.5-rc5) with this commit reverted - suspend works. Attached
is a dmesg with this setup including one successful suspend and wake up.

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