From: Ryan Hung (rwhung_at_interchange.ubc.ca)
Date: Fri Apr 02 1999 - 01:02:52 EST
I've got to say, though, that this may merely be a constraint of current
available technology. Certainly there's nothing to prevent a video
subsystem from being able to output multiple resolutions for different types
of video output (e.g. digital for LCD and analog for conventional monitor
simultaneously). One example of a new video chipset that can do this is the
Matrox G400 (http://www.matrox.com/mga/feat_story/mar99/g400_launch.htm).
> -----Original Message-----
> From: rbell1_at_csc.com [mailto:rbell1_at_csc.com]
> Sent: Thursday, April 01, 1999 6:59 PM
> To: TP List
> Subject: Re: 1280x1024 TFT question...
> I can understand your situation and I sympathize with you. I know there
> are many cases where doing a presentation works best while having both
> the LCD and the projector turned on.
> However, the situation you describe isn't a bug/glitch. The reason the
> system behaves that way is a physical design constraint of LCD screens
> and the laptop's video subsystem. The LCD has a fixed resolution and
> therefore all of the pixels must be driven, even if the outer edge of
> the screen appears blank while displaying a resolution lower than the
> maximum. Since the video subsystem can't output two different
> resolutions and you are (by your selection of both LCD and video out)
> forcing the system to use the LCD's resolution, the video out gets that
> resolution. When video out is the only thing being driven, the video
> subsystem drives it at accurately at the selected resolution.
> I guess for people using their laptops with external projectors
> regularly, matching the resolution of the laptop's LCD with the
> projector's is an important purchasing consideration.
> Sorry this isn't much help, but hopefully it explains things...
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