Re: [REGRESSION] No image on 4k display port displays connected through usb-c dock in kernel 6.10

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July 29, 2024 at 11:15 AM, "Linux regression tracking (Thorsten Leemhuis)" <regressions@xxxxxxxxxxxxx> wrote:



> 
> On 29.07.24 10:47, Christian Heusel wrote:
> 
> > 
> > On 24/07/29 10:35AM, Linux regression tracking (Thorsten Leemhuis) wrote:
> > 
> > > 
> > > [+Greg +stable]
> > > 
> > >  On 29.07.24 10:16, Lin, Wayne wrote:
> > > 
> > 
> >  Thanks for the report.
> > 
> >  Patch fa57924c76d995 ("drm/amd/display: Refactor function dm_dp_mst_is_port_support_mode()")
> > 
> >  is kind of correcting problems causing by commit:
> > 
> >  4df96ba6676034 ("drm/amd/display: Add timing pixel encoding for mst mode validation")
> > 
> >  Sorry if it misses fixes tag and would suggest to backport to fix it. Thanks!
> > 
> > > 
> > > Greg, seem it would be wise to pick up fa57924c76d995 for 6.10.y as
> > > 
> > >  well, despite a lack of Fixes or stable tags.
> > > 
> > >  Ciao, Thorsten
> > > 
> > 
> >  
> > 
> >  The issue is that the fixing commit does not apply to the 6.10 series
> > 
> >  without conflict and the offending commit does not revert cleanly
> > 
> >  aswell.
> > 
> 
> Hah, many thx, I should have checked that.
> 
> Lin, Wayne: could you maybe help out here and provide something for 6.10.y?
> 
> Ciao, Thorsten
>

I reverted 4df96ba6676034 from v6.10.2 from the stable/linux git, resolving the conflict by removing everything that git marked as from the current branch and kept everything marked as from before the branch to merge. That resulted in a patch that is fixing the problem on my machine. Since I don't understand what the code is actually doing it might break things on other machines.


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