Public bug reported:
[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, 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.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux-oem-6.11 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-6.11 (Ubuntu Noble)
Importance: Undecided
Assignee: AceLan Kao (acelankao)
Status: In Progress
** Tags: dcpl jira-dcpl-19 oem-priority
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.11 (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: linux (Ubuntu Noble)
** No longer affects: linux (Ubuntu)
** Changed in: linux-oem-6.11 (Ubuntu Noble)
Status: New => In Progress
** Changed in: linux-oem-6.11 (Ubuntu Noble)
Assignee: (unassigned) => AceLan Kao (acelankao)
** Changed in: linux-oem-6.11 (Ubuntu)
Status: New => Invalid
** Tags added: dcpl jira-dcpl-19 oem-priority
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Packages, which is subscribed to linux-oem-6.11 in Ubuntu.
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:
In Progress
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, 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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/2107439/+subscriptions
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