loading drm crashes system

[Emmanuel Vadot]

On Tue, 26 Jan 2021 07:02:11 +0000
Alexey Dokuchaev <danfe at freebsd.org> wrote:

> On Mon, Jan 25, 2021 at 10:21:16PM -0500, Robert Huff wrote:
> > Niclas Zeising asks:
> > > When did it stop working?
> > 
> > September ... I _think_.
> 
> Yeah, that sounds about right.
> 
> There are known issues with Radeon cards, they were quite well supported
> a year ago, then something got broken.  I've promised to bisect this and
> find the cause, but there were several syscall-related changes in -CURRENT
> though the course of the last year, so bisecting just the kernel is not
> enough (machine won't get to login prompt if the userland does not match),
> which cripples the process.
> 
> I still intend to take this quest, just not sure when. :(
> 
> ./danfe

 So back in November I applied a few commits from tijl@ related to
radeon and i386 (added to cc) :
https://github.com/freebsd/drm-kmod/commits/5.4-lts?author=tijl@coosemans.org

 For me this fixed radeon so that gives some timeline if someone with
non working hardware wants to bisect.
 I know that bisecting drm-kmod is somewhat hard as you always need
matching kernel code when we update it to use some new functionality in
base linuxkpi but there is nothing that I can do about it.
 It might work and be quicker to only bisect the kernel with a
stable/12 userland (no need to recompile) so I would start by testing a
kernel from early november and same date for drm-kmod.

 Tijl since you also reported a build failure a few days/weeks ago for
radeon can you report if your radeon card works ? (And which one it is).

 Cheers,

-- 
Emmanuel Vadot <manu at bidouilliste.com>