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From: John Baldwin <jhb@freebsd.org>
To: Adrian Chadd <adrian.chadd@gmail.com>
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Subject: Re: svn commit: r296548 - in head/sys: dev/agp dev/drm2 dev/drm2/i915
 modules/drm2/i915kms
Date: Tue, 12 Apr 2016 09:14:55 -0700
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On Tuesday, April 12, 2016 08:17:35 AM Adrian Chadd wrote:
> So, if I suspend in /xorg/, it works. but if I suspend now in vt, it
> doesn't work.
> 
> (Yes, vt + i915kms..)

I can confirm the same on my x220 (and this is a regression).  Switching
over to another ttyv and back "fixes" it as trasz@ noted.  I think the issue
isn't that the backlight isn't on; I think it's that the frame buffer contents
aren't restored properly and are left as all black when resuming on the
console.

-- 
John Baldwin