[Bug 100979] Radeon r4 on a6-6310(BEEMA) APU hard lockup on hibernate and on second resume from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100979

--- Comment #9 from Przemek <soprwa at gmail.com> ---
I have just upgraded kernel to 4.15.
There is a big progress. Laptop can now successfully suspend (S3) and resume 
many times in a row.

_Thank you very much for your hard work_.

But unfortunately hibernate to disk (S4) still does not work as expected.
Process is causing hard lockup (system freeze) just on the first attempt. 

Display goes black (backlight is on), cpu is getting hot (fans are working 100%
rpms), and I can do noting more than press "power button" to hard reset the
machine.

There is no more "amdgpu_atombios_dp_link_train" message in dmesg instead there
are mesages related to "swiotlb buffer is full" and "swiotlb: coherent
allocation failed" as in the bug:
https://bugs.freedesktop.org/show_bug.cgi?id=104082.

Thanks,
Przemek

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