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From: Philip Paeps <philip+freebsd@paeps.cx>
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Date: Fri, 9 Jan 2004 21:57:03 +0100
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Subject: [acpi-jp 2985] Re: Revised Toshiba driver
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On 2004-01-09 11:00:05 (-0800), Nate Lawson <nate@root.org> wrote:
> Please test this and let me know if you find any bugs.  Especially test
> things like the video output (TV/external monitory) since I'm not sure it's
> legal to have all 3 outputs active at once.

I suppose that would depend on the chipset?  My Asus laptop[1] has a SiS
chipset with two output channels, one of which is wired to a video bridge for
DVI-A/DVI-D/TV and the other is for an analog CRT.  Most video bridges can't
control two devices simultaneously (due to timing), but some can.  And then
there's machines which come with a separate controler for tvout or for lvds.

Whether it's legal or not: I doubt the machines will explode.  In the bridge
case, probably one of the devices will simply go out if you direct output to
another one (that's the case on my laptop, I select tvout, and the lcd goes
off).

Maybe to be on the safe side, read the display state from acpi again after
trying to set it to be sure no 'fake' values get saved?

 - Philip

[1] I've just about completely rewritten my original acpi_asus to be neater
overall and more like the toshiba driver in functionality.  I hope to be able
to produce a working and elegant patch Real Soon Now[tm].

-- 
Philip Paeps                                          Please don't CC me, I am
                                                       subscribed to the list.

  It takes longer to glue a vase together than to
  break one.
