Hi,
[Focal, Thinkpad T480s, 8550u/intel igpu]
Unfortunately I suspect this:
* Fix no picture from HDMI when it's plugged after boot (LP: #1924238)
- drm/i915/display: Handle lane polarity for DDI port
in *-1024 OEM 5.10 kernel, that I do use in Focal, did break HDMI hotplug after
GNOME is loaded.
HDMI works if plugged when at GDM login screen and then in GNOME itself.
Additionally, my laptop's sleep seems to be broken (I don't remember if this
happens when HDMI is working or not).
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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:
Confirmed
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 Committed
Status in linux source package in Hirsute:
Confirmed
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1924238/+subscriptions
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