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Date: Thu, 05 Sep 2013 21:11:11 -0400
From: Jung-uk Kim <jkim@FreeBSD.org>
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To: Adrian Chadd <adrian@freebsd.org>
Subject: Re: suspend/resume on Lenovo X1 (regression from reports on wiki)
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Cc: Laura Marie Feeney <lmfeeney@sics.se>,
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On 2013-09-05 20:24:46 -0400, Adrian Chadd wrote:
> Whoa whoa.
> 
> I'm confused. Well, a bit. How is it up to syscons to fix the
> backlight configuration, which seems to be a large part of the
> problem here?

No, it has nothing to do with syscons(4).  acpi_video(4) does.
However, it does not work with i915kms.ko because some piece of code
is not implemented for FreeBSD if I understand it correctly.

> Or what else is going on here with restoring the system state?

It worked with DRM1 because automatic VT-switching (aka sysctl
hw.syscons.sc_no_suspend_vtswitch) indirectly saves/restores GPU
states via X11 driver, which is no longer possible with KMS.

> I'm worried that we'll have the same problem with newcons, with or 
> without KMS. Why would KMS get involved if I'm in console mode
> doing 80x60 text? :)

If KMS is used for newcons backend, I am sure text mode won't be
implemented.  Also, KMS will "naturally" handle suspend/resume as it
is a proper newbus driver, unlike syscons.  At least, that's the idea.

Jung-uk Kim
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