[Bug 2136979] Re: Intel,External monitor flickers or no output when connected to WD25 dock

This bug is awaiting verification that the linux-azure-
fde-6.17/6.17.0-1008.8~24.04.1 kernel in -proposed solves the problem.
Please test the kernel and update this bug with the results. If the
problem is solved, change the tag 'verification-needed-noble-linux-
azure-fde-6.17' to 'verification-done-noble-linux-azure-fde-6.17'. If
the problem still exists, change the tag 'verification-needed-noble-
linux-azure-fde-6.17' to 'verification-failed-noble-linux-azure-
fde-6.17'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-noble-linux-azure-fde-6.17-v2 verification-needed-noble-linux-azure-fde-6.17

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https://bugs.launchpad.net/bugs/2136979

Title:
Intel,External monitor flickers or no output when connected to WD25
dock

Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-6.17 package in Ubuntu:
Invalid
Status in linux source package in Noble:
Invalid
Status in linux-oem-6.17 source package in Noble:
Fix Released
Status in linux source package in Questing:
Fix Released
Status in linux-oem-6.17 source package in Questing:
Invalid
Status in linux source package in Resolute:
Fix Released
Status in linux-oem-6.17 source package in Resolute:
Invalid

Bug description:
[Impact]
When the external monitor is connected to the WD25 dock, the external monitor shows black screen, move the cursor, screen flickers.

[Fix]
The commit in v6.19-rc1 fixes the issue
e109f644b871d drm/i915/dp_mst: Disable Panel Replay

To fix the conflict, cherry picked this commit from v6.18-rc1, too
9cc10041e9fe7 drm/i915/psr: Check drm_dp_dpcd_read return value on PSR dpcd init

[Test]
1. Boot to OS, Connect WD25 Dock and plug a DP/HDMI/MFDP monitor.
2. Check external monitor states

[Where problems could occur]
The drm_dp_dpcd_read() doesn't affect the call path, and disable dp_mst panel replay is reasonable. Both commits look pretty safe to me.

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