Laptop + external LCD

Robert Aldridge bamarob55 at
Thu Nov 1 17:30:54 UTC 2007

I've been running Ubuntu on a Dell Latitude D820 for a while now (started
with 6.04, I think), but have never been able to get dual monitors working
properly.  I was hopeful that the new tools I'd been hearing about in
7.10would make it easy to run dual head.  Unfortunately, I'm still

Here's my setup:

Dell Latitude D820 laptop, Genuine Intel T2600 @ 2.16GHz, 2018 MiB RAM,
Intel Mobile 945GM Express Integrated Graphics Controller

<promp>lspci|grep 00:02

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS,
943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME,
943/940GML Express Integrated Graphics Controller (rev 03)

The laptop screen runs natively at 1920x1200.  It has VGA and DVI out.  I
have an Acer AL2216W 22" Widescreen LCD monitor that I'd like to extend my
desktop on to.  However, all attempts at running dual screen have been
unsuccessful.  I did have it, at one time (under 7.04), running where my
desktop was cloned to the external LCD, but that dropped the resolution of
my laptop monitor to the same resolution as the external.

Since updating to 7.10, I haven't tried connecting the external LCD directly
to the laptop.   I have a docking station (that may be part of my problem)
that I'd like to leave the external LCD plugged into all the time.  Then,
when the laptop is docked into the station, I'd have the external LCD
available along with the internal laptop LCD.  When undocked, it'd just run
in single screen mode using the built in LCD.

Any assistance would be greatly appreciated.  I'd prefer to use the DVI port
to drive the external LCD, but would certainly settle for VGA if DVI isn't

Any tips, suggestions, links?


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