I experienced absolutely the same with an older Sapphire Radeon HD5450.
The system is a freshly installed Xubuntu 16.04.3 LTS.
I just installed the xserver-xorg-video-ati-lts-xenial package but this didn't
resolv the problem.
Currently the AMD64 4.10.0-30-generic is installed on an older Asus 775
Do we have any other ideas?
I don't think the mainline kernel can solve anything, seems like 4.4 and 4.10
is involved in this case. I think it's more likely a DRM/Mesa/Xorg related bug.
I we can't figure out anything I will jump to the 17.04 version, however I'd
like to stay in the LTS version
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radeon 0000:03:00.0: ring 0 stalled for more than 10000msec
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