"firmware/sysfb: Set firmware-framebuffer parent device" breaks lightdm on Ubuntu 22.04 using amdgpu

[Thomas Zimmermann]

Hi Marek

Am 13.06.24 um 07:59 schrieb Marek Olšák:
> Hi Thomas,
>
> Commit 9eac534db0013aff9b9124985dab114600df9081 as per the title
> breaks (crashes?) lightdm (login screen) such that all I get is the
> terminal. It's also reproducible with tag v6.9 where the commit is
> present.

I still cannot reproduce the problem reliably. But I've found a 
ref-counting bug on the parent device that was introduced by that 
commit. This needs to be fixed anyway. A patch is attached if you want 
to test.

Best regards
Thomas

>
> Reverting the commit fixes lightdm. A workaround is to bypass lightdm
> by triggering auto-login. This is a bug report.
>
> (For AMD folks: It's also reproducible with amd-staging-drm-next.)
>
> Marek

-- 
--
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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