[Bug 67121] New: Broken suspend/resume with radeon/KMS on RS482M

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=67121

            Bug ID: 67121
           Summary: Broken suspend/resume with radeon/KMS on RS482M
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.12.5
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: adi@drcomp.erfurt.thur.de
        Regression: No

Hi!

This report is somewhat similar to
https://bugzilla.kernel.org/show_bug.cgi?id=43441, but since it's about a
different card and slightly different focus, I didn't want to pollute the other
bug report with potentially misleading information.

Here's the problem: First suspend/resume cycle works, second may fail at either
suspend or resume, the machine simply hangs. Sometimes, just sometimes, the
second cycle might fully succeed, in this case, the third attempt is bound to
fail.

After the first suspend/resume cycle, removing AC power will cripple the output
as seen in these videos: 

   http://adi.loris.tv/radeon-kms1.mp4

   http://adi.loris.tv/radeon-kms2.mp4

Plugging AC back in will fix the issue until I remove the power supply again,
resulting in the same distortion. Note that AC plug/removal has to take place
when the machine is running, those events don't do a thing during suspend, so
something is clearly acting to these ACPI events, though I couldn't spot any
code in radeon that handles power events on such an old card.

I'm going to attach five register dumps taken in the following sequence:

1. Fresh boot with AC plugged in (freshboot-powered)
2. Now let's remove the AC while running, no reboot (freshboot-unpowered)
3. Now let's put the AC back in (freshboot-powered2)
4. Suspend/Resume while AC stays active (resumed-powered)
5. Now remove AC again (resumed-unpowered) --> distortion

While I think both aspects are related, I care more about the suspend/resume
than the distortion.

Note that UMS shows neither distortion nor any suspend/resume problems.

Finally, let me point out that it's always been like this. I had modeset=0 for
years (roughly since March 2011).

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