Incomplete stable drm/ast backport - screen freeze on boot

[Sasha Levin]

On Mon, Nov 13, 2023 at 10:49:01AM +0100, Thomas Zimmermann wrote:
>(cc: gregkh)
>
>Hi Jocelyn
>
>Am 13.11.23 um 10:36 schrieb Jocelyn Falempe:
>>On 13/11/2023 09:34, Keno Fischer wrote:
>>>Greetings,
>>>
>>>When connected to a remote machine via the BMC KVM functionality,
>>>I am experiencing screen freezes on boot when using 6.5 stable,
>>>but not master.
>>>
>>>The BMC on the machine in question is an ASpeed AST2600.
>>>A quick bisect shows the problematic commit to be 2fb9667
>>>("drm/ast: report connection status on Display Port.").
>>>This is commit f81bb0ac upstream.
>>>
>>>I believe the problem is that the previous commit in the series
>>>e329cb5 ("drm/ast: Add BMC virtual connector")
>>>was not backported to the stable branch.
>>>As a consequence, it appears that the more accurate DP state detection
>>>is causing the kernel to believe that no display is connected,
>>>even when the BMC's virtual display is in fact in use.
>>>A cherry-pick of e329cb5 onto the stable branch resolves the issue.
>>
>>Yes, you're right this two patches must be backported together.
>>
>>I'm sorry I didn't pay enough attention, that only one of the two 
>>was picked up for the stable branch.
>>
>>Is it possible to backport e329cb5 to the stable branch, or should I 
>>push it to drm-misc-fixes ?
>
>I think stable, which is in cc, will pick up commit e329cb5 
>semi-automatically now. Otherwise, maybe ping gregkh in a few days 
>about it.

I thikn it would be more appropriate to revert 2fb9667, as e329cb5
doesn't look like -stable material. I'll go ahead and do that.

-- 
Thanks,
Sasha