Hi Thomas,
after discussion with Niclas and I explained him that 12.1-RELEASE works but 
12-STABLE not, he mentioned to build and install "drm-fbsd12.0-kmod" from 
ports, but also "gpu-firmware-kmod" from ports (instead of prebuild pkg), what 
fixed the issue in my case. Now startx and i3 works fine.
Here how I installed the two ports; 
https://github.com/NilsJohannsen/BSD-Journal/blob/master/desktop/drm/install-drm-intel.sh
Here my hardware probe: https://bsd-hardware.info/index.php?probe=2e8c0ef401
Regards, Nils


Gesendet: Samstag, 08. August 2020 um 14:40 Uhr
Von: "Thomas Zander" <[email protected]>
An: "Niclas Zeising" <[email protected]>
Cc: "Nils Johannsen" <[email protected]>, [email protected]
Betreff: Re: drm i915kms on 12.1-STABLE (r363237)
On Tue, 21 Jul 2020 at 12:53, Niclas Zeising
<[email protected]> 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.

> Whiskey Lake isn't supported by drm-fbsd12.0-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
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