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Re: kern/53795: i915drmkms causes crash on boot with Atom N270/945GSE netbook
The following reply was made to PR kern/53795; it has been noted by GNATS.
From: "David H. Gutteridge" <david%gutteridge.ca@localhost>
Subject: Re: kern/53795: i915drmkms causes crash on boot with Atom
Date: Mon, 07 Jan 2019 21:16:06 -0500
Further questions and comments:
You didn't mention what make and model this machine is? I infer from
looking at the dmesg output that it's a 3rd generation Classmate by
Intel? On that basis, I tried to see if there were any quirks listed
for it in a recent version of the Linux i915 driver, but didn't note
Which specific Linux kernel versions does it work on? Same with
OpenBSD? NetBSD's i915 code is based on Linux 4.4, as is OpenBSD's
(for the most part). I tried comparing what had changed between 4.4
and 4.20 in Linux, but there's too much churn to be useful without
having more to go on to narrow it down. (And, indeed, it could be
the problem is somewhere in BSD-specific code, for all I know.)
Is there any more dmesg output than that? I'd expect if you ended up
with working ssh access there'd be more of it. The initial ACPI output
looks weird, i.e. I doubt all those video outputs exist on the machine.
I have no idea if that's anything more than a red herring, though.
You could enable debugging via the appropriate sysctl setting for more
verbose output (assuming it gets that far, per previous question). To
do so, you can set hw.drm2.drm_debug to a suitable value (e.g. 0xf) in
/etc/sysctl.conf. That might tell us something more.
Something else you could try -- if you're really curious -- would be to
enable the old i915drm driver instead, and see what happens there. (I
used to use the old driver on my LG X110.)
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