i915kms kernel module causing freezes on FreeBSD 13.0-RELEASE

[Matt K]

On Sat, May 8, 2021 at 1:08 AM Graham Perrin <grahamperrin at gmail.com> wrote:

>
> Try a third approach:
>
> kld_list="drm"
>
>
This works. I will keep an eye on the system, logs, etc, and let you know
what I find. Now everything seems to be working as advertised. With
xf86-video-intel, even TearFree is working.
Where is this behavior documented? How did you know about this solution?
I think that this means that my problem is solved, but the question
remains: why does i915kms cause freezes when loaded from rc.conf and works
normally when loaded by hand? This is not handbook-documented behavior. Nor
is it consistent or transparent.

On Sat, May 8, 2021 at 3:46 AM Chris Hill <chris at monochrome.org> wrote:

>
> I had a similar problem with X appearing to hang. In my case, I had to
> specify the full path:
>
> $ grep kms /etc/rc.conf
> kld_list="/boot/modules/i915kms.ko"
>
> ...in order to load the i915kms from the port graphics/drm-fbsd12.0-kmod
> rather than the one from the kernel. Yes, I had to build the port, not
> just install the pkg.
>
> Caveat: Matt just upgraded to 13.0; I'm still on 12.2-RELEASE-p4 on
> account of sloth. I'm guessing Matt probably needs
> graphics/drm-fbsd13-kmod.
>
>
This is no longer the case, Chris. i915kms got removed from base in FreeBSD
13, so only /boot/modules/i915kms.ko from ports remains and that's what
gets loaded with kld_list="i915kms". I tried and checked with kldstat -h -v
-n.

-- 
MK

On Sat, May 8, 2021 at 3:46 AM Chris Hill <chris at monochrome.org> wrote:

>
> On Sat, 8 May 2021, Graham Perrin wrote:
>
> > On 07/05/2021 19:09, Matt K wrote:
> >> - These are the possibilities to have a stable usable system with X:
> >> 1. not mentioning i915kms in rc.conf is a must. Then I can load X with
> XDM
> >> and it automatically pulls i915kms by specifying "Driver" "intel" in
> >> xorg.conf.
> >> 2. not mentioning i915kms in rc.conf is a must. Then I have to "kldload
> >> i915kms" and then I can "startx" and it works. In this case It does not
> >> matter if I have "modesetting" or "intel" in xorg.conf, both work.
> >
> > Try a third approach:
> >
> > kld_list="drm"
>
> I had a similar problem with X appearing to hang. In my case, I had to
> specify the full path:
>
> $ grep kms /etc/rc.conf
> kld_list="/boot/modules/i915kms.ko"
>
> ...in order to load the i915kms from the port graphics/drm-fbsd12.0-kmod
> rather than the one from the kernel. Yes, I had to build the port, not
> just install the pkg.
>
> Caveat: Matt just upgraded to 13.0; I'm still on 12.2-RELEASE-p4 on
> account of sloth. I'm guessing Matt probably needs
> graphics/drm-fbsd13-kmod.
>
> --
> Chris Hill               chris at monochrome.org
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-- 
MK