I think I've found the problem.
The amdgpu_amdkfd_resume_iommu(adev) call has been moved around a few times recently, but in 5.15.1 it's been removed completely.
I think reverting this patch fixes the issue: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/driv...
See also: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/driv...
Cheers,
Mark
On 10/11/2021 17:38, Greg KH wrote:
On Wed, Nov 10, 2021 at 04:27:39PM +0000, Mark Boddington wrote:
Hi all,
I run the mainline Linux kernel on Ubuntu 20.04, built from https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.15.1/
There appears to be a regression in 5.15.1 which causes the GPU to fail to resume after power saving.
Could it be this change??:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/driv...
If you revert it, does it solve the problem for you?
If not, what kernel version did work for you with this hardware?
thanks,
greg k-h