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

This bug was fixed in the package linux - 6.17.0-19.19

---------------
linux (6.17.0-19.19) questing; urgency=medium

* Questing: Failed to query NVIDIA devices (LP: #2143480)
- [Config] disable NOVA_CORE

* Miscellaneous upstream changes
- apparmor: validate DFA start states are in bounds in unpack_pdb
- apparmor: fix memory leak in verify_header
- apparmor: replace recursive profile removal with iterative approach
- apparmor: fix: limit the number of levels of policy namespaces
- apparmor: fix side-effect bug in match_char() macro usage
- apparmor: fix missing bounds check on DEFAULT table in verify_dfa()
- apparmor: Fix double free of ns_name in aa_replace_profiles()
- apparmor: fix unprivileged local user can do privileged policy
management
- apparmor: fix differential encoding verification
- apparmor: fix race on rawdata dereference
- apparmor: fix race between freeing data and fs accessing it

-- Mehmet Basaran <mehmet.basaran@canonical.com> Fri, 06 Mar 2026
15:30:11 +0300

** Changed in: linux (Ubuntu Questing)
Status: Fix Committed => Fix Released

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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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