[Bug 206575] [amdgpu] [drm] No video signal on resume from suspend, R9 380

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=206575

Thomas Frank (thfrkbz at e.mail.de) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |thfrkbz at e.mail.de

--- Comment #6 from Thomas Frank (thfrkbz at e.mail.de) ---
I have the same graphics card and the same problem.  Do you need additional
dmesg outputs from kernel 5.4.20 and 5.5.4?

I don't know if this helps but I diffed my `amdgpu` filtered dmesg outputs:

```
--- 5.4.20-1-lts_amdgpu_wo_uptime.txt   2020-02-18 18:38:07.393633705 +0100
+++ 5.5.4-arch1-1_amdgpu_wo_uptime.txt  2020-02-18 18:38:32.714488497 +0100
@@ -1,7 +1,4 @@
 [drm] amdgpu kernel modesetting enabled.
-amdgpu 0000:01:00.0: remove_conflicting_pci_framebuffers: bar 0: 0xd0000000 ->
0xdfffffff
-amdgpu 0000:01:00.0: remove_conflicting_pci_framebuffers: bar 2: 0xe0000000 ->
0xe01fffff
-amdgpu 0000:01:00.0: remove_conflicting_pci_framebuffers: bar 5: 0xefe00000 ->
0xefe3ffff
 fb0: switching to amdgpudrmfb from VESA VGA
 amdgpu 0000:01:00.0: vgaarb: deactivate vga console
 amdgpu 0000:01:00.0: VRAM: 4096M 0x000000F400000000 - 0x000000F4FFFFFFFF
(4096M used)
@@ -9,7 +6,9 @@
 [drm] amdgpu: 4096M of VRAM memory ready
 [drm] amdgpu: 4096M of GTT memory ready.
 amdgpu: [powerplay] hwmgr_sw_init smu backed is tonga_smu
+[drm:dm_helpers_parse_edid_caps [amdgpu]] *ERROR* Couldn't read SADs: -2
 fbcon: amdgpudrmfb (fb0) is primary device
 amdgpu 0000:01:00.0: fb0: amdgpudrmfb frame buffer device
-[drm] Initialized amdgpu 3.35.0 20150101 for 0000:01:00.0 on minor 0
+[drm] Initialized amdgpu 3.36.0 20150101 for 0000:01:00.0 on minor 0
 snd_hda_intel 0000:01:00.1: bound 0000:01:00.0 (ops
amdgpu_dm_audio_component_bind_ops [amdgpu])
+[drm:dm_helpers_parse_edid_caps [amdgpu]] *ERROR* Couldn't read SADs: -2
```

The last line from the diff 
`[drm:dm_helpers_parse_edid_caps [amdgpu]] *ERROR* Couldn't read SADs: -2`
happens after resuming (with blank screen).

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