>is it possible/practical to run two displays under X?
Yes, X was designed from the beginning to support this. Sun has in
the past sold dual-headed boxes.
Quote:>my thinking is that two 15" monitors would be a reasonable alternative
>to a 17 or 19 inch display.
Quote:>someone told me that the :0.0 in the display variable refers to the
the DISPLAY variable is hostname:displaynumber.screennumber .
From the Solaris X manpage (I'm not sitting in front of a Linux
box now, but it is the same):
The phrase "display" is usually used to refer to
collection of monitors that share a common keyboard
and pointer (mouse, tablet, etc.). Most worksta-
tions tend to only have one keyboard, and therefore,
only one display. Larger, multi-user systems, how-
ever, will frequently have several displays so that
more than one person can be doing graphics work at
once. To avoid confusion, each display on a machine
is assigned a display number (beginning at 0) when
the X server for that display is started. The
display number must always be given in a display
Some displays share a single keyboard and pointer
among two or more monitors. Since each monitor has
its own set of windows, each screen is assigned a
screen number (beginning at 0) when the X server for
that display is started. If the screen number is
not given, then screen 0 will be used.
Quote:>who has done this or seen this? how was the 2nd video card configured,
>and what memory address was assigned?
You need two things: underlying support at the OS level for multiple
screens, and an X server on top of this that knows how to talk to it.
I think some of the commercial X servers support multiple screens.
There have been "dualmon" patches for earlier versions of Linux, but
I don't know if that code is currently supported. The original version
would work with a Hercules-compatible card plus a VGA-compatible one
(you needed the two different kinds of cards because their addresses
would overlap otherwise).
-- Joe Buck http://www.synopsys.com/pubs/research/people/jbuck.html
Help stamp out Internet spam: see http://spam.abuse.net/spam/