[ltp] T30/HV Expansion/Projectors

[Atul Chitnis]

I need to figure this one out:

How does HV Expansion work on a TP?

Does the BIOS create a 1400x1050 extrapolated image and pump that to the 
LCD, so that even if I change my resolution to, say, 1024x768 (to 
accommodate a projector/beamer), it is actually still pumping 100x1050?

I have found that some (not all) projectors are happier if I have HV 
Expansion turned off on my T30, but I *also* find something weird:

When I have HV Expansion turned on, setting my display to any resolution 
will still get me a full-screen image on my LCD. That's OK - that's how it 
is supposed to work.

But with HV Expansion turned off, the machine boots correctly with a small 
central text image (no vga=832 in grub.conf), and when X comes up, it 
switches to full screen 1400x1050 mode.

Here is where the weirdness begins - I change resolution (xrandr), and the 
display correctly resizes and shrinks, but then *immediately* expands 
again to fill the full screen! I have to hit Fn-F8 a couple of time before 
it shrinks to the correct size (unexpanded).

Does anyone know what's going on? This is a TP T30, with FC3, fully 
updated.

TIA

Atul