Public bug reported:
[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.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Medium
Status: Confirmed
** Affects: linux-oem-5.10 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: Won't Fix
** Affects: linux-oem-5.10 (Ubuntu Focal)
Importance: Medium
Status: Confirmed
** Affects: linux (Ubuntu Hirsute)
Importance: Medium
Status: Confirmed
** Affects: linux-oem-5.10 (Ubuntu Hirsute)
Importance: Undecided
Status: Invalid
** Tags: oem-priority originate-from-1908030 stella
** Also affects: linux-oem-5.10 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.10 (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.10 (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Status: New => Won't Fix
** Changed in: linux (Ubuntu Hirsute)
Status: New => Confirmed
** Changed in: linux (Ubuntu Hirsute)
Importance: Undecided => Medium
** Changed in: linux-oem-5.10 (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux-oem-5.10 (Ubuntu Focal)
Importance: Undecided => Medium
** Changed in: linux-oem-5.10 (Ubuntu Hirsute)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1924238
Title:
Fix no picture from HDMI when it's plugged after boot
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