I have the same problem with a Presario 2199US, which also has the Radeon Mobility U1. As with Thomas, I get bios, boot messages, and usplash on the external monitor. Just before GDM comes up, the laptop LCD goes completely blank (no backlight) for a few seconds; at that time, the external monitor loses the signal.
If I have booted the machine with the external monitor plugged in, tty1-6 will display on both the LCD and the external monitor. If I plug the monitor in after X has started, however, the virtual terminals will only display on the LCD. I tried adding the "Virtual 2048 2048" line to xorg.conf (both with and without the "Depth" and "Modes" lines). This does prevent "xrandr --output LVDS --left-of VGA-0" from throwing an error, but it does not produce output on the external monitor. After this command, my desktop does seem to expand (I can move the mouse off the right edge of the screen), so it seems like X is convinced that everything is working correctly. There's just no signal to the external monitor. This is something of a regression for Ubuntu 6.10, which was previously on the laptop. There, external monitors were generally able to clone the LCD, although X would often restart whenever they were plugged or unplugged. (The details depended on the external monitor, and I was never able to discern a pattern.) Please let me know what further information I should add. -- open source ati driver in hardy can't do external monitor on laptop https://bugs.launchpad.net/bugs/222905 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
