Incomplete stable drm/ast backport - screen freeze on boot

[Thomas Zimmermann]

(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.

Best regards
Thomas

> 
> Best regards,
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
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