Bug#493096: xserver-xorg-video-intel: [855GM] External monitor unusable

["Andrew Moise" <chops@demiurgestudios.com>]

  FWIW, I also had this problem with 2.3.2-2+lenny1 (and not with
2.3.2-2), and the version from
http://people.debian.org/~jcristau/493096/ did fix it for me.  I also
got a backtrace of where X was hanging when it was too busy to bring
my windows up:

0xb7b13cfa in i830_crt_detect (output=0x8aaac00) at ../../src/i830_crt.c:285
285     ../../src/i830_crt.c: No such file or directory.
        in ../../src/i830_crt.c
(gdb) bt
#0  0xb7b13cfa in i830_crt_detect (output=0x8aaac00)
    at ../../src/i830_crt.c:285
#1  0x080f64b0 in xf86ProbeOutputModes (scrn=0x8aa84d8, maxX=2048, maxY=2048)
    at ../../../../hw/xfree86/modes/xf86Crtc.c:1275
#2  0x080f6e24 in xf86InitialConfiguration (scrn=0x8aa84d8, canGrow=0)
    at ../../../../hw/xfree86/modes/xf86Crtc.c:1577
#3  0xb7b1e918 in I830PreInit (pScrn=0x8aa84d8, flags=<value optimized out>)
    at ../../src/i830_driver.c:1634
#4  0x080ab42f in InitOutput (pScreenInfo=0x8210bc0, argc=3, argv=0xbfd9e124)
    at ../../../../hw/xfree86/common/xf86Init.c:548
#5  0x08074591 in main (argc=3, argv=0xbfd9e124, envp=0xbfd9e134)
    at ../../dix/main.c:369

  Thanks for your help.  It's nice to look to file a bug, find that
one already exists, find that new packages are available, and find
that the new packages fix the bug :-).
  Cheers.