[Bug 91707] Hibernation doesn't work with AMD Radeon R7 265

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=91707

            Bug ID: 91707
           Summary: Hibernation doesn't work with AMD Radeon R7 265
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: rogutes+freedesktop@gmail.com

Created attachment 117828
  --> https://bugs.freedesktop.org/attachment.cgi?id=117828&action=edit
dmesg output

Hibernation works perfectly when using the integrated Intel GPU, but
it only works once when using the discrete AMD Radeon R7 265.

I am testing different GPUs by changing the primary GPU in BIOS.

When trying to hibernate for the second time, I see one of 2 outcomes:
1. Display powers off, but the system stays on and stops responding to
   ICMP pings and sysrq; after reset the system boots afresh and fsck
   is run.
2. System powers off, but doesn't resume on next boot: boots afresh and
   fsck is run.

More observations:
* Suspend to RAM works every time.
* Hibernation works every time as long as X has not been started.
* I am running Arch Linux, swap is on an SSD and not encrypted. I usually start
hibernation with `systemctl hibernate`, but writing to /sys/power/state has the
same effect.

I have no idea how to debug this issue, but would be happy to do it with your
help.

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