Update
Now running Natty, I again attempted to get an external monitor working
via the HDMI port. The nvidia-settings tool, it turns out, *does*
recognize the external monitor. After some time tinkering with the
system, I realized that the problem may be completely different.
Specifically, what appears to be wrong is that the keyboard Fn key
combination for the switch video mode key (Fn + F3, on the U460) is
not handled correctly by the udev keyboard mechanism (or by something;
I'm no expert). With the /lib/udev/keymap utility, I was able to see
that pressing that key combination results in *two* keycodes: one, 0xDB,
interpreted as leftmeta, and a second, 0x19, interpreted as p.
Holding down Fn and repeatedly pressing F3 results in just one 0xDB
at the beginning and then a separate lower-case p for each subsequent
keypress.
I tried to follow the udev keyboard troubleshooting guide, but nothing I
tried made the system respond with anything different.
I then found a tool called disper (not in the Ubuntu repositories),
which allows for screen switching with the NVidia drivers, and with that
tool I was successful in getting the laptop to drive the external
monitor.
Therefore, I don't consider this a problem with the display subsystem at
all, at least not in Natty.
Note that I'm running the laptop with its BIOS set up to force the
NVidia hardware and bypass the Intel hardware.
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https://bugs.launchpad.net/bugs/624684
Title:
[arrandale] Lenovo U460 HDMI doesn't work
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