Bug 218959

(In reply to Thorsten from comment #0)

> I find that hardware detection only works with upstream-kernel 6.8 version
> lower than 6.8.9. In fact I am running 6.8.4

It would be great if you could check if mainline is affected (e.g. 6.10-rc3 or (in about 30 hours -rc4). And if it is, bisect the problem. Narrowing down the range (e.g. is 6.8.8 really fine) could help, too.

Please ideally do so with vanilla kernels.

(In reply to The Linux kernel's regression tracker (Thorsten Leemhuis) from comment #1)
> (In reply to Thorsten from comment #0)

> It would be great if you could check if mainline is affected (e.g. 6.10-rc3
> or (in about 30 hours -rc4). And if it is, bisect the problem. Narrowing
> down the range (e.g. is 6.8.8 really fine) could help, too.
> 
> Please ideally do so with vanilla kernels.

Thanks for your reply! Will do so and try to narrow the versions down. I am doing my testing on vanilla kernels only (anyway) and will post results here.

(In reply to Thorsten from comment #2)
> I am doing my testing on vanilla kernels only (anyway)

In the other bug it sounded like you were using zfs -- some people would not call this vanilla. For say an mm bug I guess that would be considered a problem, for this bug it might not.

https://linux-regtracking.leemhuis.info/post/frequent-reasons-why-linux-kernel-bug-reports-are-ignored/

(In reply to The Linux kernel's regression tracker (Thorsten Leemhuis) from comment #3)
> (In reply to Thorsten from comment #2)
> > I am doing my testing on vanilla kernels only (anyway)
> 
> In the other bug it sounded like you were using zfs -- some people would not
> call this vanilla. For say an mm bug I guess that would be considered a
> problem, for this bug it might not.
> 
> https://linux-regtracking.leemhuis.info/post/frequent-reasons-why-linux-
> kernel-bug-reports-are-ignored/

It's my everyday-working-laptop and I am running it on zfs all right. But I tested on second installation running on ext4 without any extra module as well in the past and will do so now.

But thank you for that reminder! I'll surely consider it ;-)

(In reply to The Linux kernel's regression tracker (Thorsten Leemhuis) from comment #1)
> (In reply to Thorsten from comment #0)

> It would be great if you could check if mainline is affected (e.g. 6.10-rc3
> or (in about 30 hours -rc4). And if it is, bisect the problem. Narrowing
> down the range (e.g. is 6.8.8 really fine) could help, too.
> 
> Please ideally do so with vanilla kernels.

So I did some testing just now and found out that it really does not make a difference whether it's vanilla or the distro's version (or with zfs-module loaded). They all behave alike in terms of working sound or having the bug.

Most important (and new to me): mainline does not seem to be affected (at least true for 6.10-rc3)! Sound works! Will try rc4 next.

Concerning the older versions: 6.9.x does not recognize my sound-hw at all. 6.8.x works exactly up to version 6.8.4. From 6.8.5 on it obviously "loses" its ability to detect sound-hw - from a users point of view ;-)

Sounds like something that broke was included in 6.9 and backported to 6.8.5 -- and later fixed for 6.10, but the fix was not backported (yet) to 6.9.

A git bisection between 6.8.4 and 6.8.5 could help to find the culprit -- or a bisection between 6.9 and 6.10-rc3 what fixed things. But with a bit of luck that fix is alredy heading towards 6.9.y anyway (might be worth trying 6.9.5 if you haven't yet)

Well, you are absolutely right! 6.10-rc4 works as well as 6.9.5 does!! Thank you very much for your expertise and the brief insight into the ways of the kernel code ;-)

I greatly appreciate it and mark this thread "solved".