Intel 2.0.0 driver fails on two screen dual head configuration

Eric Anholt eric at
Fri May 4 10:06:24 PDT 2007

On Fri, 2007-05-04 at 12:45 -0400, in-freedesktop at wrote:
> I have a Fujitsu P7120 Lifebook with an Intel Corporation Mobile
> 915GM/GMS/910GML Express Graphics Controller, running Gentoo.
> I was successfully using the old i810 xorg driver (1.7.4) in a
> dual-head dual-screen configuration (:0.0 was the laptop flat panal,
> while :0.1 was the VGA port, which was sometimes connected to a
> projector, and sometimes disconnected--usually disconnected on boot/X
> startup).  This is my preferred configuration.

As noted in the README, the old zaphod-mode dualhead wasn't supported in
this release.  Instead, you just place no configuration in your
xorg.conf and then use xrandr to configure placement of CRTCs at runtime
if the default mode isn't what you want, or use the new xorg.conf(5)
Monitor options to statically configure them.

There are hardware limitations that make the new xrandr-based multihead
unusable for certain configurations that were partially functional
before.  If someone can come up with a reasonable way to reintegrate
zaphod mode with the current RandR modesetting code, I wouldn't mind
seeing it done.

> When I upgraded to the new intel xorg driver (2.0.0), my configuration
> failed.  With sufficient pounding, I was able to get it to work in a
> single-screen configuration (or a cloned screen configuration if an
> external monitor was plugged into the VGA port at the time of X
> startup).  However, I get a segmentation violation when I attempt to
> use the server in a two screen configuration.  I can produce the
> coredump if absolutely necessary, but since I don't currently have the
> X server or drivers compiled with debugging symbols, I would prefer
> not to if possible.  Switching back to the older driver allows my
> preferred configuration to work again.
> So, I have:
> Original working dual-screen i810-driver xorg.conf with associated log file.
> Current single-screen intel-driver xorg.conf with associated log file.
> Failing dual-screen intel-driver xorg.conf with associated log file.
> I will attach the failing configuration below, but will not attach the
> other two working configurations (unless requested) due to space
> considerations.  The web mirrors will eventually
> I would greatly appreciate assistance in getting this configuration

Eric Anholt                             anholt at
eric at                         eric.anholt at

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