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Re: kern/49398 (i386-current GENERIC (i915drmkms) boot hangs if monitor powered off)
The following reply was made to PR kern/49398; it has been noted by GNATS.
From: "John D. Baker" <jdbaker%mylinuxisp.com@localhost>
Subject: Re: kern/49398 (i386-current GENERIC (i915drmkms) boot hangs if
monitor powered off)
Date: Thu, 14 May 2015 23:39:20 -0500 (CDT)
On Thu, 14 May 2015, riastradh%NetBSD.org@localhost wrote:
> Via the serial console, can you get a stack trace from ddb?
When last I tried, I could not. The machine was completely hung and
required power-cycle to regain control.
> If not, we can try printf debugging. I'd start by adding printfs
> around all the calls to drm_add_edid_modes in i915, and throughout
> drmfb_attach. That should be enough to get started, but I can supply
> a patch if you'd like.
I am away from the machine until early June and can try then.
> Also: does this happen on any machine other than your i845?
Of the only other machines I have with intel graphics, one doesn't power
up due to bad capacitors. The other uses an i82945G/P, but it only
ever boots a kernel with DRM/KMS disabled entirely and is generally not
available for testing (it's my file server). As such, it reboots just
fine even when the monitor is off.
I may have access to other intel-graphics-equipped machines I can poke
at, but it will be early June before I can try.
So far, the problem does not occur on radeon-equipped machines.
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