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Debian/X.org notes - Dual-Head config breaks with xserver-xorg-video-intel - Brice Goglin's Blog

Aug. 11th, 2007

12:56 - Debian/X.org notes - Dual-Head config breaks with xserver-xorg-video-intel

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The Intel driver 2.0 brings RandR 1.2 support, enabling dynamic multiple heads configuration. Some old Xinerama/dual-head configs cause the server to crash at startup. Basically, the new driver only supports the new config syntax, and it might not ever get fixed.

To solve this problem, you need to update your /etc/X11/xorg.conf:

See this Debian bug for an example for configuration update and this upstream bug.

Note that other driver are being ported to RandR-1.2 (nv 2.1 for G80, ati and mga coming soon), so the bug might be non-Intel specific in the near future.

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Date:August 29th, 2007 21:22 (UTC)

tiny update :-)

thanks for the info! now, it finally works :-)

just had to change the xrandr syntax a little bit.
so here it is...

xrandr --output VGA-0 --right-of LVDS

and before that i issued a...
xrandr --output VGA-0 --mode 1024x768

so both, the laptop's screen and the standalone VGA screen, have the same resolution. otherwise it was complaining.

beautiful :-)
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Date:August 29th, 2007 21:54 (UTC)

output names are not standardized (yet?)

Intel outputs are named LVDS (internal laptop panel), TMDS-1 (external DVI port), VGA (external VGA port), TV (external TV output). In the ATI randr-1.2 driver, it's LVDS, DVI-0, VGA-0, S-video (DVI-1 for second DVI and VGA-1 for second VGA if they exist). With the nv driver (it supports RandR 1.2 on G80 boards), it seems to be LVDS and DVI0 (and DVI1 if it exists).

All these might be standardized one day, but it's not yet, so it depends on the driver. If you don't now which one to use, running xrandr without argument shows the list of outputs with their names.

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