[Bug 107781] amdgpu hangs on resume on Lenovo A475

https://bugs.freedesktop.org/show_bug.cgi?id=107781

--- Comment #4 from Alex Findler walthervondervogelweide@gmx.de --- I've tried with all kernels that Fedora offered during the last two months, including 4.16 varieties.

These are the kernel options I tried: radeon.cik_support=0 amdgpu.cik_support=1 scsi_mod.scan=sync amdgpu.gpu_recovery=1 amdgpu.dc=1

I have now added the option iommu=soft, and it seems to solve the problem! I have tried suspend via script (echo mem > /sys/power/state), via hardware button, and via plasmashell option, and all come back, including wake-up by lid signal. I'll test this for a couple of days now and see if it works persistently, then report back.

Thanks for your quick reaction, it is much appreciated.