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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" <>
Subject: Re: kern/49398 (i386-current GENERIC (i915drmkms) boot hangs if
 monitor powered off)
Date: Tue, 20 Oct 2015 23:17:30 -0500 (CDT)

 On Tue, 20 Oct 2015, John D. Baker wrote:
 > It would appear then, that I915_READ() is working, but that the value
 > read remains less than or equal to "vsample" indefinitely.  Adding another
 > line to print.
   dsl=0x5a vsample=0x1e4
 machine is hung spining on this condition forever.
 So, what sets up this condition when booting with no monitor attached
 (or a CRT attached that is powered off)?
 The i82845 machine hangs forever in this case.  The i82915 machine
 boots, but reconnecting a monitor does not display anything.  The
 E7221 machine assumes a default 1024x768 mode with no monitor attached.
 Suggestions on where to poke next?
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