This bug was fixed in the package linux-firmware - 1.187.31
---------------
linux-firmware (1.187.31) focal; urgency=medium
* The system hangs when HDMI external monitor involved on AMD Yellow Carp
platforms (LP: #1970293)
- amdgpu: update yellow carp DMCUB firmware
* [SRU][F/J] Update firmware of MT7922 (LP: #1970923)
- linux-firmware: update firmware for MT7922 WiFi device
- linux-firmware: update firmware for mediatek bluetooth chip (MT7922)
* [SRU][F][linux-firmware] UBUNTU: SAUCE: Update firmware of WCN6855 (LP:
#1972806)
- SAUCE: WCN6855 hw2.0: update board-2.bin
- SAUCE: WCN6855 hw2.0: 1.1: add
WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.9
-- Juerg Haefliger <jue...@canonical.com> Fri, 13 May 2022 13:35:44
+0200
** Changed in: linux-firmware (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1970293
Title:
The system hangs when HDMI external monitor involved on AMD Yellow
Carp platforms
Status in HWE Next:
New
Status in linux-firmware package in Ubuntu:
Fix Released
Status in linux-firmware source package in Focal:
Fix Released
Status in linux-firmware source package in Jammy:
Fix Released
Status in linux-firmware source package in Kinetic:
Fix Released
Bug description:
[Summary]
1. The system will hang on when the HDMI external monitor is connected.
2. The system will hang on after the HDMI external monitor is unplugged.
3. The system will show no display when the HDMI external monitor is
unplugged, but the system not hangs on.
a. if connect HDMI external monitor back, the system will hang on.
b. if connect type-c HDMI external monitor, the system works well.
Note:
1. Only built-in HDMI can duplicate.
2. FHD/4K monitor both can duplicate
[Steps to reproduce]
2. Boot to OS
3. Connect external montior on HDMI port.
[Expected result]
The system can work well when the external monitor is connected.
[Actual result]
The system hangs on with the HDMI external monitor.
[Failure rate]
2/3
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