virtual screen > 2048 pixels, Intel 945

[Tamas Papp]

Hi,

I have an Intel 945 video card in my laptop.  I would like to use an
external monitor (positioned right of the main screen), but the total width
exceeds 2048, the virtual screen size, pixels so I can't.

My xorg.conf has

Section "Screen"
        Identifier "Screen"
        Device     "Card0"
        Monitor    "Monitor0"
        SubSection "Display"
               Viewport   0 0
                Depth     24
                Virtual 2560 1024
        EndSubSection
EndSection

so the virtual screen should be big enough, but apparently X ignores this.
I found this in the log:

(EE) intel(0): Cannot support DRI with frame buffer width > 2048

Questions:

1. Is X ignoring the Virtual setting because of the DRI, or some other
reason?
2. If it is the DRI, can I disable it somehow?  I tried various things
(including disabling glx, dri and dri2 in the modules section, Option "DRI"
"false" for the device), but

$ glxinfo | head
name of display: :0.0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.2
server glx extensions:
    GLX_ARB_multisample, GLX_EXT_visual_info, GLX_EXT_visual_rating,
    GLX_EXT_import_context, GLX_EXT_texture_from_pixmap,
GLX_OML_swap_method,
    GLX_SGI_make_current_read, GLX_SGIS_multisample, GLX_SGIX_hyperpipe,
    GLX_SGIX_swap_barrier, GLX_SGIX_fbconfig, GLX_MESA_copy_sub_buffer

and

$ grep dri /var/log/Xorg.0.log
        X.Org XInput driver : 4.0
(WW) "dri" will not be loaded unless you've specified it to be loaded
elsewhere.
(WW) "dri2" will not be loaded unless you've specified it to be loaded
elsewhere.
(II) "dri" will be loaded even though the default is to disable it.
(II) "dri2" will be loaded even though the default is to disable it.

so I don't think I was successful.

Any help would be appreciated.  I am happy to run the laptop without DRI,
but I need that second screen on the right, not below.  It used to work
fine, but a recent upgrade (I don't know which) changed things.  I am using
Debian,
$ dpkg -l xserver-xorg-video-intel | grep ii
ii  xserver-xorg-video-intel                      2:2.8.0-1
$ uname -r
2.6.31-rc4-686

Thank you,

Tamas
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