[ltp] 770Z and External Video Projectors
Wed, 11 Oct 2000 22:01:40 -0700
Crispin Cowan wrote:
> I have a ThinkPad 770Z (9549-8AU, 13" 1280x1024 LCD) and an urgent need
> to get it to talk to an external video projector.
Answering my own question, I've discovered some operational tweeks that
help get things done:
* You cannot switch from LCD to external video, or from external video
to LCD, *while* X is on the screen. However, if you do an ALT-CTRL-F#
to a text-mode console, switch video, and then ALT-CTRL-F7 back to X,
it works fine.
* This hack also works for suspend, i.e. if you switch to a text console
first, you can suspend and resume, and then switch back to the X
* This mode line produces a workable external video at 1024x768, which
is low-enough resolution for my InFocus LP400 to display
Modeline "1024x768" 75.00 1024 1048 1184 1328 768 771 777 806 -hsync -vsync
I hope this helps someone on this list.
Some respondants also suggested that I check the list archives. I learned
of the list from this web page
http://www.Linux-ThinkPad.org/mail-list.html but I didn't see any sign of
an archive. Can someone point me at archives?
Finally, I'd like to apologies for posting my query twice: latency from
post->appearance appears to be about 90 minutes, which is much longer than
I am accustomed to.
> Currently I'm running Red Hat 6.2 + GNOME (really Immunix OS 6.2, but
> that's effectively Red Hat) and it works fine on the internal LCD.
> Video has two problems:
> * When ever it suspends, the screen locks up upon resume. The kernel
> is still ok (e.g. network access still works, and even ALT-CTRL-F#
> gets you a text mode screen) but the X session is shot to hell. The
> screen fills with odd stripes that gradually fade, etc.
> * When I try to switch between internal and external video, it locks
> hard. The kernel is NOT ok; the machine is really locked up. This
> goes both wasy:
> o boot with no external monitor, X comes up on the LCD, plug in
> external monitor and press FN-F7, and it locks.
> o boot with an external monitor plugged in, X comes up on the
> tube, press FN-F7, and it locks.
> I suspect that these problems are related, in that they both seem to act
> like some kind of bad (re)initialization of the video chips.
> The specific X version is XFree86-3.3.6-20_StackGuard (which should be
> identical in functionality to XFree86-3.3.6-20).
> Anyone encounter these kinds of problems? Anyone know how to get a
> Thinkpad 770Z to talk nicely to external video?
> Crispin Cowan, Ph.D.
> Chief Research Scientist, WireX Communications, Inc. http://wirex.com
> Free Hardened Linux Distribution: http://immunix.org
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Crispin Cowan, Ph.D.
Chief Research Scientist, WireX Communications, Inc. http://wirex.com
Free Hardened Linux Distribution: http://immunix.org
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