Comment # 21 on bug 1193640 from Takashi Iwai

(In reply to Felix Miata from comment #20)
> I thought the 15.4 code freeze was later this month?

We have already kABI freeze, and only P1 bugs are accepted for the GM kernel.
The rest fixes (including this) are merged to the maintenance update kernel
that will be released right after GM release.

> Is 15.3 going to get
> this fix backported?

Unlikely.  The patches are not compatible with the older DRM code at all, hence
not trivial to backport.

> It's hard to believe nobody found (and reported
> upstream) this problem until over 6 months after the Rocket Lake hardware
> was released to market. :p

The bug pretty much depends on BIOS, and luckily most of machines are with a
saner BIOS, as it seems :)

> Anyway, TW is now good for >1 displays with
> kernel-default-5.16.7-1.1.g0503f69, and thanks for getting the upstream fix
> into BS so fast. :)

OK, then let's close for now.  It's already merged in both stable and SLE15-SP4
git branches.

> It seems simpledrm is in it too. Is this correct?

It's not enabled as default.  You still need to specify a special boot option
to boot with simpledrm (and the option is temporary, only for (open)SUSE
downstream).