[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=211807

--- Comment #10 from Nils Tonnätt (nils.tonnaett at posteo.de) ---
I patched 5.14.5. I see now difference in behavior. When the screen stays black
it often works to switch to a tty or turn off and on the display. Dmesg seems
to became a little more verbose about this:

[   64.800268] [drm] DM_MST: stopping TM on aconnector: 000000007957d743 [id:
97]
[   64.820206] amdgpu 0000:09:00.0: [drm] Cannot find any crtc or sizes
[   66.970887] [drm] DM_MST: starting TM on aconnector: 000000007957d743 [id:
97]
[   67.173165] amdgpu 0000:09:00.0: [drm] *ERROR* mstb 00000000ca721b5e port 8:
DPCD read on addr 0x60 for 1 bytes NAKed
[   67.176906] [drm] fb mappable at 0x7C00502000
[   67.176907] [drm] vram apper at 0x7C00000000
[   67.176907] [drm] size 33177600
[   67.176908] [drm] fb depth is 24
[   67.176908] [drm]    pitch is 15360
[   67.176965] fbcon: amdgpu (fb0) is primary device
[   67.192813] amdgpu 0000:09:00.0: [drm] *ERROR* mstb 00000000ca721b5e port 8:
DPCD read on addr 0x60 for 1 bytes NAKed
[   67.670123] Console: switching to colour frame buffer device 480x135
[   67.708683] amdgpu 0000:09:00.0: [drm] fb0: amdgpu frame buffer device
[   72.960002] rfkill: input handler disabled
[   73.139379] amdgpu 0000:09:00.0: [drm] *ERROR* mstb 00000000ca721b5e port 8:
DPCD read on addr 0x60 for 1 bytes NAKed
[   80.216335] rfkill: input handler enabled
[   80.534571] amdgpu 0000:09:00.0: [drm] *ERROR* mstb 00000000ca721b5e port 8:
DPCD read on addr 0x60 for 1 bytes NAKed

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