[Bug 1934864] Re: [SRU][OEM-5.10/H] Fix HDMI output issue on Intel TGL GPU

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-
hirsute' to 'verification-done-hirsute'. If the problem still exists,
change the tag 'verification-needed-hirsute' to 'verification-failed-
hirsute'.

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!


** Tags added: verification-needed-hirsute

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https://bugs.launchpad.net/bugs/1934864

Title:
[SRU][OEM-5.10/H] Fix HDMI output issue on Intel TGL GPU

Status in HWE Next:
New
Status in linux package in Ubuntu:
Invalid
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux-oem-5.10 source package in Focal:
In Progress
Status in linux source package in Hirsute:
Fix Committed

Bug description:
SRU justification:

[Impact]
When plugin HDMI cable, no HDMI output, kernel reported error:
[drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon
[drm:lspcon_resume [i915]] *ERROR* LSPCON init failed on port

[Fix]
Legacy LSPCON chip from MCA and Parade is only used for platforms,
Limit the support between GEN9 and GEN10.
The commit is already in 5.13, so only SRU for oem-5.10 and hirsute.

[Test]
Verified on hardware, HDMI output works fine.

[Where problems could occur]
The HDMI output may break.

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