Created attachment 144006 [details]
dmesg with amdgpu.dc=1 drm.debug=7 in boot command

We have an Acer Squirtle_SR laptop equipped with AMD A9-9420e RADEON R5, 5
COMPUTE CORES 2C+3G and [AMD/ATI] Topaz XT [Radeon R7 M260/M265 / M340/M360 /
M440/M445] [1002:6900].  We test it with Linux kernel 5.1.0-rc5+.

The kernel includes the patch [1] mentioned in comment 110360#c9 [2].

System keeps screen black after system resumes from suspending.

The error keeps showing on dmesg:

[  177.401716] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout,
signaled seq=290, emitted seq=294
[  177.401848] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information:
process Xorg pid 569 thread Xorg:cs0 pid 571
[  177.401855] [drm] IP block:gfx_v8_0 is hung!
[  177.401932] [drm] GPU recovery disabled.

01:00.0 Display controller [0380]: Advanced Micro Devices, Inc. [AMD/ATI] Topaz
XT [Radeon R7 M260/M265 / M340/M360 / M440/M445] [1002:6900] (rev c3)
        Subsystem: Acer Incorporated [ALI] Topaz XT [Radeon R7 M260/M265 /
M340/M360 / M440/M445] [1025:1217]
        Flags: bus master, fast devsel, latency 0, IRQ 40
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Memory at d0000000 (64-bit, prefetchable) [size=2M]
        I/O ports at 3000 [size=256]
        Memory at d1400000 (32-bit, non-prefetchable) [size=256K]
        Expansion ROM at d1440000 [disabled] [size=128K]
        Capabilities: [48] Vendor Specific Information: Len=08 <?>
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
<?>
        Capabilities: [150] Advanced Error Reporting
        Capabilities: [270] #19
        Capabilities: [2b0] Address Translation Service (ATS)
        Capabilities: [2c0] Page Request Interface (PRI)
        Capabilities: [2d0] Process Address Space ID (PASID)
        Kernel driver in use: amdgpu
        Kernel modules: amdgpu

[1] https://patchwork.kernel.org/patch/10889269/
[2] https://bugzilla.freedesktop.org/show_bug.cgi?id=110360#c9