Created attachment 145058 [details]
blackscreen bug log
System: HP 15-bw660ur
GPU: Radeon 520 (Sun XT)
Screen freezes after resuming from suspend. Here is discussion of this bug - https://bugs.archlinux.org/task/61950.
I made a bisection in branch linux-5.0.y between the tags v5.0-rc1 and 4.20. I found that there are two bugs with the screen after resuming from suspend. The first bug is the one that is present in the kernel v.5 now and earlier to version 5.0-rc1. There is a bug with amdgpu_job_timedout in the log. The second is the black screen after resuming from suspend and the absence of the amdgpu_job_timedout error in the log.
The second bug first appears in commit [262485a50fd4532a8d71165190adc7a0a19bcc9e] drm/amd/display: Expand dc to use 16.16 bit backlight.
The first bug with amdgpu_job_timedout first appears in the commit [106c7d6148e5aadd394e6701f7e498df49b869d1] drm/amdgpu: abstract the function of enter/exit safe mode for RLC.
During the bisect searching for the first error, I went through the following stages sequentially: good (resuming from suspend was successful), error 2, good, error 2, error 1.
Created attachment 145059 [details]
amdgpu_job_timedout error log
*** This bug has been marked as a duplicate of bug 110258 ***