AMDPU breaks suspend after kernel 5.0

Gao, Likun Likun.Gao at
Wed Jul 31 10:21:57 UTC 2019

Hi Gover,

Sorry for responds late, can you help to give a try to add the patch attached and share me the related result and logs? 
Besides, do you have tried to revert this commit to see whether it's good?


-----Original Message-----
From: Paul Gover <pmw.gover at> 
Sent: Tuesday, July 30, 2019 9:34 PM
To: Gao, Likun <Likun.Gao at>
Cc: amd-gfx at
Subject: AMDPU breaks suspend after kernel 5.0

Hi Likun,

Sorry if you don't want emails like this.  I added info. to
but people on Gentoo forums said email would be better.

Git bisect lead me to you:
106c7d6148e5aadd394e6701f7e498df49b869d1 is the first bad commit commit 106c7d6148e5aadd394e6701f7e498df49b869d1
Author: Likun Gao <Likun.Gao at>
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 at>
    Acked-by: Christian K├Ânig <christian.koenig at>
    Reviewed-by: Alex Deucher <alexander.deucher at>
    Signed-off-by: Alex Deucher <alexander.deucher at>

:040000 040000 8f3b365496f3bbd380a62032f20642ace51c8fef 
e14ec968011019e3f601df3f15682bb9ae0bafc6 M      drivers
Symptoms are when resuming after pm-suspend, the screen is blank or corrupt, the keyboard dead, and syslog shows
kernel: [   81.096666] [drm:amdgpu_job_timedout] *ERROR* ring gfx timeout, 
signaled seq=51, emitted seq=52
kernel: [   81.096671] [drm] IP block:gfx_v8_0 is hung!
kernel: [   81.096734] [drm] GPU recovery disabled.
or similar.  The problem occurs with all kernels since 5.0 up to and including 5.3-rc2.  My laptop is:

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]

There are several similar reports on the web, most or all for Stoney hardware, but that might be a coincidence as laptop users are more concerned about suspend, and there are a lot of laptops with similar integrated graphics motherboards.

I'm running Gentoo with a custom kernel, the most relevant bits of the config CONFIG_DRM_AMDGPU=y # CONFIG_DRM_AMDGPU_SI is not set # CONFIG_DRM_AMDGPU_CIK is not set # CONFIG_DRM_AMDGPU_USERPTR is not set

If you tell me how, I'm willing to try to collect traces etc.

Paul Gover

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