Can anyone help with a multiple monitor system?

John Emmas
Sun Aug 24 08:08:00 GMT 2008

I found a log file called XWin.log and it immediately told me what was

" winScreenInit - Monitors do not all have same pixel format / display
Using primary display only. "

As an experiment, I tried setting both my monitors to 1200x1024 at
16-bit depth. XWin then launched and worked as expected.  Curiously,
I found that I can set my monitors to different settings AFTER I start XWin
and it seems to be quite happy to carry on working.  It just doesn't seem
to like *starting* if the monitor settings are different, which is a pity.

Armed with my new knowledge I decided to search Google.  I'd always thought
that I was unusual in having twin monitors running at different resolutions
but in fact, it seems to be quite common.  I found lots of comments about
the same problem - though not all of them about Cygwin.  Some were about
a package (project?) called "".  I've never heard of this.
Can anyone tell me if it's connected with Cygwin or is it something totally



----- Original Message ----- 
From: "John Emmas" <>
To: <>
Sent: 23 August 2008 09:31
Subject: Can anyone help with a multiple monitor system?

>I have a dual-head (twin monitor) setup using a Matrox Millenium G400
> graphics card.  I've been using this successfully for many years under
> both
> Windows and Linux (64Studio).
> Using GTK, I've built a myself a small "Hello World" type app.  It's just
> a
> simple GTK dialog box with a label saying "Hello World" and a 'Close'
> button.  If I build it under GNU GCC and run it under Linux it runs fine.
> However, if I re-boot into Windows and build it under Cygwin, it only
> displays properly on my left-hand monitor.  If I drag the dialog box to my
> right-hand monitor, the dialog gets displayed - but not its contents.
> I'm starting my X server by running startxwin.bat which can be found in
> c:\cygwin\usr\X11R6\bin.  I've already taken a look within startxwin.bat
> and
> I noticed that it offers various command-line switches to Xwin.  One of
> these is '-multiplemonitors' which I thought might help.  I modified
> startxwin.bat to add this as an extra parameter when starting Xwin but it
> didn't make any difference.  Can anyone suggest anything else I could try?
> Thanks,
> John
> --
> Unsubscribe info:
> Problem reports:
> Documentation:
> FAQ:         

Unsubscribe info:
Problem reports:

More information about the Cygwin-xfree mailing list