Created attachment 288569 [details]
After updating kernel from 5.6.4 to 5.6.5 reboot and shutdown do not work any more. My laptop Lenovo Thinkpad T495 is simply hanging forever with display turned off, but the keyboard backlit and power led on.
I did bisection and it points to
drm/amdgpu: fix gfx hang during suspend with video playback (v2)
kernel stable 5.6.x commit: a1f57b87ddcc869b576aca73608f35cb436c3fdc
kernel stable 5.4.x commit: bdac1d76a310578b3ad081df2db97da59e241010
Indeed, after reverting this commit, both kernels reboot or shutdown properly.
Created attachment 288571 [details]
Fixed in my latest -fixes pull:
Thanks! I applied the patch and the problem is gone. Both reboot and shutdown work again.
*** Bug 207347 has been marked as a duplicate of this bug. ***
Fixed in stable versions 5.6.6 and 5.4.34.