Going back to Andrea Colangelo's comment, can someone who understands
this better than I sanity check this?

Xorg.0.log showed the monitor could support 1280x800:

(II) VESA(0): Modeline "1280x800"   71.11  1280 1328 1360 1440  800 802
808 823 -hsync -vsync

The bios returned SEVERAL 1280x1024 modes:
Mode: 107 (1280x1024)
Mode: 119 (1280x1024)
Mode: 11a (1280x1024)
Mode: 11b (1280x1024)
Mode: 163 (1280x1024)
Mode: 164 (1280x1024)
Mode: 165 (1280x1024)
Mode: 166 (1280x1024)
Mode: 124 (1280x1024)

but then it concluded:

(II) VESA(0): Total Memory: 256 64KB banks (16384kB)
(II) VESA(0): Generic Monitor: Using hsync range of 28.00-51.00 kHz
(II) VESA(0): Generic Monitor: Using vrefresh range of 43.00-60.00 Hz
(II) VESA(0): Not using built-in mode "1024x768" (no mode of this name)
(II) VESA(0): Not using built-in mode "1024x768" (no mode of this name)
(II) VESA(0): Not using built-in mode "800x600" (no mode of this name)
(II) VESA(0): Not using built-in mode "800x600" (no mode of this name)
(II) VESA(0): Not using built-in mode "640x480" (no mode of this name)
(II) VESA(0): Not using built-in mode "640x480" (no mode of this name)
(WW) VESA(0): No valid modes left.  Trying less strict filter...

Backtrace:
0: /usr/bin/X11/X(xf86SigHandler+0x81) [0x80c8641]
1: [0xffffe420]
2: /usr/bin/X11/X(InitOutput+0x9a4) [0x80a8304]
3: /usr/bin/X11/X(main+0x27b) [0x8076c7b]
4: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0) [0xb7d20030]
5: /usr/bin/X11/X(FontFileCompleteXLFD+0x1ed) [0x80761b1]

Is that backtrace because of a possible bug in the "less strict filter"?

It seems to me that an available 1280x1024 mode of the video card should
be able to be masked off as a portal into a 1280x800 display, or am I
just being silly?

-- 
[regression] 7.2 broke vesa: "No matching modes found"
https://bugs.launchpad.net/bugs/89853
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