This bug was fixed in the package linux-oem-6.11 - 6.11.0-1021.21
---------------
linux-oem-6.11 (6.11.0-1021.21) noble; urgency=medium
* noble/linux-oem-6.11: 6.11.0-1021.21 -proposed tracker (LP:
#2107098)
* Fix UCSI call trace on some platforms (LP: #2107762)
- acpi: typec: ucsi: Introduce a ->poll_cci method
* Fix Cirrus codec CS42L43 resume failure (LP: #2107310)
- ASoC: cs42l43: Add jack delay debounce after suspend
* Cannot recongnize two 4k@60hz external monitors on SD25 DOCK (LP: #2107439)
- drm/amd/display: switch amdgpu_dm_connector to use struct drm_edid
- drm/amd/display: Reduce accessing remote DPCD overhead
* System hang while connecting dock during s2idle on AMD system (LP: #2106783)
- Revert "UBUNTU: SAUCE: platform/x86/amd: pmc: Add a number of Dell systems
to ovp_delay quirk"
- Revert "UBUNTU: SAUCE: platform/x86/amd: pmc: Add a number of Dell systems
to ovp_delay quirk"
- Revert "UBUNTU: SAUCE: platform/x86/amd: pmc: Add the ability to set a
s2idle loop delay quirk"
- SAUCE: platform/x86/amd: pmc: Require at least 2.5 seconds between HW
sleep
cycles
[ Ubuntu: 6.11.0-25.25 ]
* oracular/linux: 6.11.0-25.25 -proposed tracker (LP: #2107099)
* Packaging resync (LP: #1786013)
- [Packaging] update annotations scripts
* log_check/kernel_tainted failed with kernel warnings at
kernel/time/timer_migration.c:543 on Oracular (LP: #2106022)
- timers/migration: Fix off-by-one root mis-connection
-- Kuan-Ying Lee <kuan-ying....@canonical.com> Tue, 22 Apr 2025
15:19:27 +0800
** Changed in: linux-oem-6.11 (Ubuntu Noble)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2107439
Title:
Cannot recongnize two 4k@60hz external monitors on SD25 DOCK
Status in HWE Next:
New
Status in linux-oem-6.11 package in Ubuntu:
Invalid
Status in linux-oem-6.11 source package in Noble:
Fix Released
Bug description:
[Impact]
Plug 2 monitors on the dock, and connect the dock to the machine,
only one or none of the 2 monitors works.
[Fix]
The issue has been fixed in 6.12.13/6.13, and after bisect the first bad
commit on the stable kernel is
f488b53b54435 drm/amd/display: Reduce accessing remote DPCD overhead
[Test]
1. Plug dock the the machine
2. Plug 2 4k@60hz monitors on the dock, and both monitor should work as
expected.
[Where problems could occur]
It reduces the necessity of calling dp_get_link_current_set_bw(). The worst
case of this may be it doesn't re-caculate the bandwidth when needed and
doesn't enable DSC which may reduce the external monitor's resolution or the
framerate.
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