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kern/53795: i915drmkms causes crash on boot with Atom N270/945GSE netbook
>Synopsis: i915drmkms causes crash on boot with Atom N270/945GSE netbook
>Arrival-Date: Sun Dec 16 23:50:00 +0000 2018
>Originator: Elliott Shue
I have an Atom N270 powered netbook with an Intel 945GSE chipset. It is a re-branded ECS E09EI6. It works fine in OpenBSD and Linux.
If I boot the GENERIC NetBSD kernel with i915drmkms enabled I get a hang with garbage on the screen right when intelfb should be initialized.
If I disable i915drmkms in userconf I can get the system to boot and complete the install. I've built a kernel without i915drmkms for now to play around. It runs, but X falls back to vesa.
The last lines before the screen goes blank and displays garbage are:
i915drmkms0: interrupting at ioapic0 pin 16 (i915)
drm: initialized overlay support
drm: GMBUS [i915 gmbus vga] timed out, falling back to bit-banging on pin 2
I had to take a video of the screen since a serial console is not possible. Here is a snapshot of the last frame before it goes black:
I built a kernel with the legacy i915drm, it boots, but I don't get a proper framebuffer and also am stuck with vesa for X.
The problem exists in 7.x as well.
Boot this netbook with i915drmkms enabled.
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