[SOLVED] Can't send output to external monitor

I've got a Dell Inspiron 1501 laptop which I sometimes use to give presentations at my school. Last time, in mid october, it worked perfectly, but now my laptop and the digital projector seem to ignore each other. The only difference between last time and now is that I've updated the system.
This is output of xrandr -q:
$ xrandr -q
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 4096 x 4096
VGA-0 disconnected (normal left inverted right x axis y axis)
LVDS connected 1280x800+0+0 (normal left inverted right x axis y axis) 331mm x 207mm
1280x800 61.0*+
It says that VGA-0 is disconnected, which isn't the case. I've tried pressing Fn+CTR/LCD but it doesn't make any difference.
Can anyone tell me if I am missing something? What's wrong? Why doesn't it work now if it worked fine just over a month ago? Is this a problem with the new X server?
I know I'm asking a lot of questions, but I'd really appreaciate any help. I wouldn't like my students to get the idea that Linux is unreliable (or maybe that I'm just not smart enough).
Cheers
Last edited by troncoso (2009-12-18 19:47:58)

Thanks for answering. Yes, it has an integrated ATI card, and I'm running the radeon driver without an xorg.conf. This is what "lspci -v" says about the card:
01:05.0 VGA compatible controller: ATI Technologies Inc RS482 [Radeon Xpress 200M] (prog-if 00 [VGA controller])
Subsystem: Dell Device 01f5
Flags: bus master, 66MHz, medium devsel, latency 66, IRQ 17
Memory at c8000000 (32-bit, prefetchable) [size=128M]
I/O ports at 9000 [size=256]
Memory at c0100000 (32-bit, non-prefetchable) [size=64K]
[virtual] Expansion ROM at c0120000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: radeon
Kernel modules: radeon, radeonfb
Cheers

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00 FF FF FF FF FF FF 00 30 AE A1 40 00 00 00 00
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24 4B 53 00 00 00 01 01 01 01 01 01 01 01 01 01
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Solved!
Go to Solution.

Follow-up:
I have tried the latest "generic" Intel driver after completely uninstalling the device driver from device manager: without success.
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I have opened a call with my hardware support.
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[SOLVED] Can't send output to external monitor

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