This bug was fixed in the package linux-oem-5.10 - 5.10.0-1025.26

---------------
linux-oem-5.10 (5.10.0-1025.26) focal; urgency=medium

  * focal/linux-oem-5.10: 5.10.0-1025.26 -proposed tracker (LP:
#1926155)

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

  * CirrusLogic: Cracking noises appears in built-in speaker when output volume
    is set >80% (LP: #1924997)
    - SAUCE: ALSA: hda/cirrus: Use CS8409 Equalizer to fix abnormal sounds on
      Bullseye

 -- Timo Aaltonen <timo.aalto...@canonical.com>  Mon, 26 Apr 2021
16:18:11 +0300

** Changed in: linux-oem-5.10 (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1924238

Title:
  Fix no picture from HDMI when it's plugged after boot

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Fix Committed
Status in linux-oem-5.10 package in Ubuntu:
  Invalid
Status in linux source package in Focal:
  Won't Fix
Status in linux-oem-5.10 source package in Focal:
  Fix Released
Status in linux source package in Hirsute:
  Fix Committed
Status in linux-oem-5.10 source package in Hirsute:
  Invalid

Bug description:
  [Impact]
  On Intel CML desktop, there's no HDMI output when the cable is not
  connected pre-boot.

  [Fix]
  Properly handle lane polarity so the driver can write different values
  to the register to enable the port.

  [Test]
  1. Boot with DP display.
  2. Connect HDMI under GNOME desktop.
  3. No picture on HDMI monitor.
  With the fix applied, the issue is resolved.

  [Where problems could occur]
  If the BIOS VBT table is not correct, which did happen in the pase, this
  fix may break those ports.

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