This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1989647
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1989647
Title:
Fix AMDGPU: No video output and system hangs with two monitor (dGPU:
W6400)
Status in Ubuntu:
New
Status in linux package in Ubuntu:
Incomplete
Bug description:
[Impact]
There's possibility that system will hang and no video output of two external
monitor with dGPU W6400
Monitor 1: ASUS ProArt PA238Q (FHD)
Monitor 2: Dell P2415Q (4K)
[Fix]
Introduce the dmi quirk in amdgpu,
and add dmi quirks to bypass the affected machine.
[Test Case]
Two ways to verify
Method 1:
1. Cold boot with ASUS
2. Attach Dell monitor. ASUS is primary.
3. Switch display mode to single ASUS
4. Switch disaply mode back to Joing Displays. ASUS is primary
Method 2:
1. Cold boot with two monitors. ASUS is primary
2. Unplug the DP cable of Dell monitor from DUT and wait for few seconds
3. Plug it back to DUT
[Where problems could occur]
Low, add a dmi quirk to bypass the target machine.
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