** Changed in: linux-oem-5.6 (Ubuntu Focal)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1902613
Title:
drm/i915/dp_mst - only read the base capability in DPCD.
Status in HWE Next:
New
Status in linux-oem-5.6 package in Ubuntu:
Invalid
Status in linux-oem-5.6 source package in Focal:
Fix Committed
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).
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