[Bug 1902469] Re: drm/i915/dp_mst - System would hang during the boot up.

This bug was fixed in the package linux - 5.8.0-36.40+21.04.1

---------------
linux (5.8.0-36.40+21.04.1) hirsute; urgency=medium

* Packaging resync (LP: #1786013)
- update dkms package versions

[ Ubuntu: 5.8.0-36.40 ]

* debian/scripts/file-downloader does not handle positive failures correctly
(LP: #1878897)
- [Packaging] file-downloader not handling positive failures correctly

[ Ubuntu: 5.8.0-35.39 ]

* Packaging resync (LP: #1786013)
- update dkms package versions
* CVE-2021-1052 // CVE-2021-1053
- [Packaging] NVIDIA -- Add the NVIDIA 460 driver

-- Kleber Sacilotto de Souza <kleber.souza@canonical.com> Thu, 07 Jan
2021 11:57:30 +0100

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

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-1052

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-1053

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https://bugs.launchpad.net/bugs/1902469

Title:
drm/i915/dp_mst - System would hang during the boot up.

Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-5.6 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Invalid
Status in linux-oem-5.6 source package in Focal:
Fix Released
Status in linux source package in Groovy:
Fix Released

Bug description:
[Impact]
The machine connect with the external monitor on dock(Thunderbolt),
Then system would hang during the boot-up.

[Fix]
The atomic check hooks must look up the encoder to be used with a
connector from the connector's atomic state, and not assume that it's
the connector's current attached encoder. The latter one can change
under the atomic check func, or can be unset yet as in the case of MST
connectors.

[test]
With the patch, The machine connect with the external monitor on dock(Thunderbolt),
Then system boot up successfully.

[Regression Potential]
Low. This patch is also verified by others and is archived in the drmtip.

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