Re: NULL ptr dereference in cs42l43/cs35l56 on Lenovo Yoga 7 Slim laptop

[Charles Keepax <ckeepax@opensource.cirrus.com>]

On Tue, Nov 10, 2026 at 01:30:52PM +0100, Krzysztof Hałasa wrote:
> I'm trying to use some audio on a certain new laptop:
> DMI: LENOVO 83R0/LNVNB161216, BIOS UCCN16WW 08/07/2026. Aka Yoga 7 Slim
> 14ILL11 or something like that. Also LENOVO_MT_83R0_BU_idea_FM_Yoga
> Slim 7 14ILL11.
> Linux version 7.4.0-rc2+
> Ubuntu 26.04.01 LTS.
> Kernel config is copied from Ubuntu 26.04.01 LTS test kernel.
> Lots of ACPI errors in dmesg.
> 
> Tried 7.3.something first, no NULL ptr dereferences, but it tried to
> talk with some ghost rt711-sdca chip, and the sound didn't work either.
> 7.2.x, there were some topology problems or something, apparently that
> was fixed in the tree.
> 

Not one I have seen before, could you re-try 7.3 but with this
patch added:

commit e0cb731652a1bebf962086f17d1b7c9d060cb7d6
soundwire: dmi-quirks: Disable ghost rt711 on Lenovo Yoga Slim 7

That should fix the ghost rt711 problem and would be good to see
if this is a regression. Pretty sure it is but probably makes
sense to confirm first.

Thanks,
Charles