drm i915kms on 12.1-STABLE (r363237)

[Thomas Zander]

On Tue, 21 Jul 2020 at 12:53, Niclas Zeising
<zeising+freebsd at daemonic.se> wrote:

> On 2020-07-17 11:49, Nils Johannsen wrote:
>
> > yesterday I installed 12.1-STABLE [1] with kernel version `uname -K` 1201519 on my ThinkPad E490 with 'Intel UHD Graphics 620' [2].
> > But if I install the 'drm-fbsd12.0-kmod' and load the driver `kldload /boot/modules/i915kms.ko` it will only show a black screen until I manually poweroff the notebook.
> > See the `/var/log/messages` [3] below. The 'drm-fbsd12.0-kmod' from pkg [4] behaves the sames as if I build it manually from ports. On 12.1-RELEASE it worked just fine.
>
> You need to upgrade to 13-CURRENT and use drm-devel-kmod.

I don't think this is the root cause. I am seeing the exact same issue
after upgrading a Sandy Bridge machine with on-chip-GPU to a recent
-STABLE. Worked perfectly fine before with the abandonware-i915kms in
base as well as with drm-legacy-kmod. Now both are showing a mere
black screen, just like Nils reported. Maybe the recent MFCs of
linuxkpi stuff broke something. I'll build some kernels and modules
and see if I find the issue. Meanwhile, if it's been discovered (and
fixed) already, let me know.

Riggs