Sorry. I'm a newbie. I just installed Ubuntu 8.04 on my M200. My Toshiba
M200 is in a docking station with external monitor connected on the
docking station's VGA.

After Ubuntu suggested the use of the nvidia driver, I enabled it. After
doing so and rebooting my screen was gone and only visible on the
(closed) laptop.

As a workaround I disabled the nvidia driver thus going back to use the
standard ubuntu (free) Xorg driver.

This works but doesn't allow for 3D/ 2D desktop effects and probably
hinders some Math programs, don't know yet. I hope my comment is ok.
Just wanted to let you know, there is more than one user with this
issue.

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Laptop screen doesn't dpms off when using an external screen (Toshiba M200)
https://bugs.launchpad.net/bugs/210230
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