NACK[J]: [PATCH 0/1][SRU][J/OEM-5.17] Fix AMDGPU: No video output and system hangs with two monitor (dGPU: W6400)

[Stefan Bader]

On 16.09.22 19:11, Tim Gardner wrote:
> On 9/15/22 01:50, Koba Ko wrote:
>> BugLink: https://bugs.launchpad.net/bugs/1989647
>>
>> [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.
>>
>> Fangzhi Zuo (1):
>>    drm/amd/display: Ignore First MST Sideband Message Return Error
>>
>>   .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 39 +++++++++++++++++++
>>   .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  8 ++++
>>   .../display/amdgpu_dm/amdgpu_dm_mst_types.c   | 17 ++++++++
>>   3 files changed, 64 insertions(+)
>>
> Already in Jammy stable updates:
> 
> linux-5.15.y.txt:c7720f23bb93628f30f16d033eaefbe2540f1b5e drm/amd/display: 
> Ignore First MST Sideband Message Return Error

As Tim pointed out this is in upstream stable (5.15.58) which is part of the 
2022.09.19 cycle and since it is too late to include the additional bug 
reference in the changelog, the auto-close there won't work. So rejecting it for 
jammy.

-Stefan
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