[Bug 106979] Cannot suspend system with Radeon RX550 [1002:699f] , kernel 4.17.0-0.rc7.git2.2.fc29

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106979

            Bug ID: 106979
           Summary: Cannot suspend system with Radeon RX550 [1002:699f] ,
                    kernel 4.17.0-0.rc7.git2.2.fc29
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: adamw at happyassassin.net

Yesterday I bought a Radeon RX550 adapter (PCI ID 1002:699f) to replace a dying
GeForce for my desktop. It worked OK all day, but when I tried to suspend the
system at the end of the day, it failed - the system was left running but
unresponsive and had to be reset.

Looking at the logs of the boot which ended with the failed suspend attempt, I
see this:

Jun 19 23:00:06 adam.happyassassin.net NetworkManager[1317]: <info> 
[1529474406.7296] manager: sleep: sleep requested (sleeping: no  enabled: yes)
Jun 19 23:00:06 adam.happyassassin.net NetworkManager[1317]: <info> 
[1529474406.7300] manager: NetworkManager state is now ASLEEP
Jun 19 23:00:06 adam.happyassassin.net gnome-shell[1729]: Screen lock is locked
down, not locking
Jun 19 23:00:06 adam.happyassassin.net gnome-shell[1729]: Failed to set power
save mode for output DP-1: Permission denied
Jun 19 23:00:06 adam.happyassassin.net gnome-shell[1729]: Failed to set power
save mode for output DVI-D-1: Permission denied
Jun 19 23:00:07 adam.happyassassin.net kernel: ------------[ cut here
]------------
Jun 19 23:00:07 adam.happyassassin.net kernel: kernel BUG at
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:4708!

...and that's all - the trace I'd expect to follow the 'kernel BUG' line does
not appear.

This is on Fedora Rawhide with kernel 4.17.0-0.rc7.git2.2.fc29.x86_64 . The
desktop is GNOME on Wayland, and I have two displays attached to the adapter,
one via DVI and one via DisplayPort.

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