[Bug 110258] Lenovo V110-15AST AMD A9-9410 AMD R5 Stoney hangs after waking after suspend. 5.0-5.1rc2

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Comment # 8 on bug 110258 from
Git bisect:

106c7d6148e5aadd394e6701f7e498df49b869d1 is the first bad commit
commit 106c7d6148e5aadd394e6701f7e498df49b869d1
Author: Likun Gao <Likun.Gao@amd.com>
Date:   Thu Nov 8 20:19:54 2018 +0800

    drm/amdgpu: abstract the function of enter/exit safe mode for RLC

    Abstract the function of amdgpu_gfx_rlc_enter/exit_safe_mode and some part
of
    rlc_init to improve the reusability of RLC.

    Signed-off-by: Likun Gao <Likun.Gao@amd.com>
    Acked-by: Christian König <christian.koenig@amd.com>
    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

:040000 040000 8f3b365496f3bbd380a62032f20642ace51c8fef
e14ec968011019e3f601df3f15682bb9ae0bafc6 M      drivers

This run on my HP 15-bw0xx
cpu:AMD A9-9420 RADEON R5, 5 COMPUTE CORES 2C+3G
with integrated graphics:
Stoney [Radeon R2/R3/R4/R5 Graphics] [1002:98E4]

I get the same symptoms as above;
a more involved scenario that may shed light is to switch to a tty and stop xdm
(and hence sddm) so I have no graphics sessions running.
pm-suspend followed by resume works and brings me back to the tty, but when I
then start xdm, I get a broken screen, usually garbage or grey, and syslog
shows something like the following:
[drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, signaled seq=49,
emitted seq=51
[drm] IP block:gfx_v8_0 is hung!
[drm] GPU recovery disabled.

If I enable amdgpu.gpu_recovery=1
kernel: [  279.726475] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx
timeout, signaled seq=57, emitted seq=59
kernel: [  279.726536] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process
information: process X pid 2860 thread X:cs0 pid 2861
kernel: [  279.726542] [drm] IP block:gfx_v8_0 is hung!
kernel: [  279.726609] amdgpu 0000:00:01.0: GPU reset begin!
kernel: [  279.726992] amdgpu 0000:00:01.0: GRBM_SOFT_RESET=0x000F0001
kernel: [  279.727047] amdgpu 0000:00:01.0: SRBM_SOFT_RESET=0x00000100
kernel: [  279.863162] [drm] recover vram bo from shadow start
kernel: [  279.863164] [drm] recover vram bo from shadow done
kernel: [  279.863166] [drm] Skip scheduling IBs!
kernel: [  279.863191] amdgpu 0000:00:01.0: GPU reset(2) succeeded!
kernel: [  280.015794] [drm:amdgpu_cs_ioctl [amdgpu]] *ERROR* Failed to
initialize parser -125!

I can probably run diagnostics or collect a trace if someone tells me what and
how.

The problem persists - I still get it running kernel 5.2.1


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