[Bug 97838] Hang on resume [AMD/ATI] RV515/M54 [Mobility Radeon X1400]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97838

            Bug ID: 97838
           Summary: Hang on resume [AMD/ATI] RV515/M54 [Mobility Radeon
                    X1400]
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: mar.kolya at gmail.com

I've got Dell Inspiron 6400 with Ubuntu 16.04, oibaf drivers and kernel 4.7.3.

The box doesn't seem to be able to come out of STR - it just hangs with black
screen.

I've tried 'echo devices > /sys/power/pm_test; echo mem > /sys/power/state' and
on resume I often get to see my desktop but then box completely freezes - no
keyboard, no mouse, no net.

I've tried suspending/resumeing in console mode and could not reproduce this
problem.

On previous Ubuntu kernels (stock) it hangs often, but sometimes it is able to
resume, in 4.7.3 it seems to be handging close to 100% percent of the time.

Unfortunately I'm not really able to get any debug logs since box gets totally
frozen. Is there any way I can provide any more information or debug this?

Thanks!

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