[Bug 100759] [r600] System freeze on resume from sleep on battery with DPM enabled and linux 4.10

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100759

            Bug ID: 100759
           Summary: [r600] System freeze on resume from sleep on battery
                    with DPM enabled and linux 4.10
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: nicolamori at aol.com

Created attachment 130983
  --> https://bugs.freedesktop.org/attachment.cgi?id=130983&action=edit
journalctl log for failed resume

Since linux 4.10.1 my system freezes every time when resuming from sleep
(suspend to ram) while on battery. The screen either remains black or displays
garbage, and the only thing to do is a hard poweroff. The problem does not show
up when either:

- running on AC or
- using linux 4.9 (tested with 4.9.11) or
- DPM is not enabled (radeon.dpm=0)

I checked journalctl but it does not contain anything useful. I attach the last
part of the log, starting from the suspend request; it seems nothing from the
failed resume process is logged.

System details:

- Archlinux x86_64
- Mobility Radeon HD 3470
- Plasma desktop 5.9.4

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