[Bug 97471] kworker consumes 100% of a cpu core when screen sleeps with amdgpu kernel driver.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97471

            Bug ID: 97471
           Summary: kworker consumes 100% of a cpu core when screen sleeps
                    with amdgpu kernel driver.
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: malcolmlewis at opensuse.org

Created attachment 126008
  --> https://bugs.freedesktop.org/attachment.cgi?id=126008&action=edit
System information and perf data

Hi
I have configured my system to use the amdgpu kernel driver (note no
experimental support activated) on openSUSE Tumbleweed and running
4.8.0-rc2-3.gda13dfd-default. I did have to re-build the xf86-video-amdgpu to
add my Mullins R5 PCI-IDs. I don't see this when running the radeon driver.

Reproducible: Always

Steps to Reproduce:
1. Boot to Gnome desktop.
2. Set timeout for screen saver 1-15 minutes doesn't matter.
3. From a remote ssh session monitor via top and observe one cpu at ~100% when
screen save activates.

Actual Results:  
I ran the following perf command to capture some data which will add as an
attachment;

perf record -F 250 -g -a sleep 10
perf report

Expected Results:  
Not consume cpu when idle/screensaver mode.

Attachment includes;
20-amdgpu.conf, dmidecode.txt, perf_data_summary.txt, 4.8.rc3.perf.data,
os-release and Xorg.0.log

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