drm/i915/dp_mst - only read the base capability in DPCD.
Bug #1902613 reported by
koba
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
HWE Next |
Fix Released
|
Undecided
|
Unassigned | ||
linux-oem-5.6 (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Medium
|
koba |
Bug Description
[Impact]
Currently DRM driver assume the source device caps is higher than the MST device
caps. With this commit, the statement would be broken.
e.g. the source device only support DP1.2 and the mst device support DP1.4.
The source device can't output the video to the external monitor on the docking station.
[Fix]
Revert the previous patch and only read the base capability from DPCD.
[test]
With the patch, The machine(DP1.2) connect with the external monitor on docking station(SC) and
can output the video to the external monitor on docking station(SC-DP1.4).
[Regression Potential]
Can't output 4k@60hz on the docking station(SC).
description: | updated |
no longer affects: | hwe-next |
no longer affects: | hwe-next/focal |
no longer affects: | ubuntu |
no longer affects: | Ubuntu Focal |
Changed in linux-oem-5.6 (Ubuntu Focal): | |
status: | New → In Progress |
assignee: | nobody → koba (kobako) |
tags: | added: oem-priority originate-from-1899609 somerville |
no longer affects: | hwe-next |
tags: | added: originate-from-1900651 |
Changed in linux-oem-5.6 (Ubuntu): | |
status: | New → Invalid |
Changed in linux-oem-5.6 (Ubuntu Focal): | |
importance: | Undecided → Medium |
Changed in linux-oem-5.6 (Ubuntu Focal): | |
status: | In Progress → Fix Committed |
tags: |
added: verification-done-focal removed: verification-needed-focal |
Changed in hwe-next: | |
status: | New → Fix Released |
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This bug is awaiting verification that the 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- focal' to 'verification- done-focal' . If the problem still exists, change the tag 'verification- needed- focal' to 'verification- failed- focal'.
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!