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.or=
g/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 se=
cond
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 functio=
n of
enter/exit safe mode for RLC.
During the bisect searching for the first error, I went through the followi=
ng
stages sequentially: good (resuming from suspend was successful), error 2,
good, error 2, error 1.