Messages in this thread | | | Date | Fri, 12 Aug 2022 12:35:55 +0300 | From | Mika Westerberg <> | Subject | Re: Apple Thunderbolt Display chaining |
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Hi Brad,
On Thu, Aug 11, 2022 at 10:17:02PM +0800, Brad Campbell wrote: > G'day Mika, > > Okay, do you see in the dmesg whether the DP tunnels are actually > > created when you see the issue? > > > > Yes, the DP tunnels appear to be created. Xorg sees them and believes they are there : > > brad@bkd:~$ grep -A1 EDID /var/log/Xorg.0.log.old > [ 29.377] (II) AMDGPU(0): EDID for output HDMI-A-0 > [ 29.377] (II) AMDGPU(0): Manufacturer: DEL Model: a19d Serial#: 810240841 > -- > [ 29.377] (II) AMDGPU(0): EDID Version: 1.3 > [ 29.377] (II) AMDGPU(0): Digital Display Input > -- > [ 29.377] (II) AMDGPU(0): Number of EDID sections to follow: 1 > [ 29.377] (II) AMDGPU(0): EDID (in hex): > [ 29.377] (II) AMDGPU(0): 00ffffffffffff0010ac9da1494b4b30 > -- > [ 29.377] (II) AMDGPU(0): EDID for output DisplayPort-0 > [ 29.377] (II) AMDGPU(0): Manufacturer: APP Model: 9227 Serial#: 354616281 > -- > [ 29.377] (II) AMDGPU(0): EDID Version: 1.4 > [ 29.377] (II) AMDGPU(0): Digital Display Input > -- > [ 29.378] (II) AMDGPU(0): Number of EDID sections to follow: 1 > [ 29.378] (II) AMDGPU(0): EDID (in hex): > [ 29.378] (II) AMDGPU(0): 00ffffffffffff0006102792d9032315 > -- > [ 29.378] (II) AMDGPU(0): EDID for output DisplayPort-1 > [ 29.378] (II) AMDGPU(0): Manufacturer: APP Model: 9227 Serial#: 437126968 > -- > [ 29.378] (II) AMDGPU(0): EDID Version: 1.4 > [ 29.378] (II) AMDGPU(0): Digital Display Input > -- > [ 29.378] (II) AMDGPU(0): Number of EDID sections to follow: 1 > [ 29.378] (II) AMDGPU(0): EDID (in hex): > [ 29.378] (II) AMDGPU(0): 00ffffffffffff000610279238070e1a > > This test was done with thunderbolt compiled in just to demonstrate, > but any load sequence or combination > winds up with the same issue.
I went through your log but could not find anything out of ordinary from TBT perspective. The tunnels get cleaned up by the discovery code and then re-created after the reset completes and they seem to be fine. You may try to add some sort of delay like 100ms or so after the DPR reset but I doubt it changes anything.
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