Well, I just finished installing 7.04 and indeed the video switching
works just fine there.

In 7.10, I suspect it's a problem with the hotkey keymask in 
/etc/modprobe.d/thinkpad_acpi.modprobe
the contents of which are, by default:

options thinkpad_acpi hotkey=enable,0xffff8f experimental=1

As near as I can tell, this should set the mask to 0xffff8f in
/proc/acpi/ibm/hotkey to that value, but instead it has the following
contents:

status: enabled
mask: 0xffffff
commands: enable, disable, reset, <mask>

as you can see the mask is trivial, capturing all key strokes.

In 7.04, Fn+F7 doesn't generate an acpi event. I'm guessing it goes
straight to the hardware and does the right thing.

To fix this, I somehow have to get the mask in /proc/acpi/ibm/hotkey to
be what it was in 7.04, but all of my attempts to change it have been
ignored.

Any help?

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IBM R52 Laptop, LCD/CRT toggle doesn't work
https://bugs.launchpad.net/bugs/159185
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