From: Benjamin Koh (benkoh_at_stanford.edu)
Date: Wed Apr 05 2000 - 15:53:58 EDT
The built-in video on Thinkpads (some 770-type machines excepted) cannot
drive two different monitors. What this means is that the video output
on the port is EXACTLY the same (before A/D conversion) as the one sent
to the internal display. LCDs apparently refresh at 60hz, or at least
report that they do (maybe they just return a dummy value and do their
own stuff). In any case this means that as long as the internal display
is active, the external display is locked to the same resolution as the
internal display. On my 560X when I hook an external display up I am
limited to a physical resolution of 800x600, 60hz. Once the internal
display is disabled and the system restarted I can choose a range of
resolutions on the external monitor - I have used it at true 1024x768
resolution, 75hz. Much better. I would presume that on a 600 series
machine you would also be able to go to whatever resolutions the monitor
actually supports. Of course if the video chip is limited to 1024x768 as
noted below, that's the highest you'll ever go. The big plus is that
disabling the internal displays allows a much higher refresh rate on the
external monitor. I personally find it a big improvement as it lessens
my eye fatigue.
Benjamin
"sehh of H.I.C. & D.B.S." wrote:
>
> On Wed, 5 Apr 2000 12:24:56 -0400, Tony Rice wrote:
>
> >I've got a Thinkpad 600E 2645-8BU and the port replicator running WinNT 4.0
> >SP5. The maximum desktop area I can get on the external monitor is 1024x768
> >without dropping to 256 colors and 60 hz (yuck!). Is there anyway to get
> >the desktop area up to 1280x1024 or is it a limitation of the video chipset?
>
> I've got a 600E too 2645-something and i have the same limitation, it seems its
> a limitation in the hardware.
>
> Although the NM2200 chipset spec says it can go up to 1024x768x32 at 75hz, but
> i haven't confirmed it yet, i'll have to check on NeoLogic's website.
>
> I know its rather pathetic, makes the external monitor practicaly impossible to use.
>
> þ H.I.C. & D.B.S. þ OS/2 Warp þ Hellas þ
> þ ServerConfig þ ConfigEdit þ OS/2 UK UG þ
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