Not only is DisplaySize ignored, but also poorly used to calculate the reported 
DPI:
[    1.453431] (II) RADEON(0): Output DVI-0 using initial mode 1280x1024
after xf86InitialConfiguration
[    1.453507] (**) RADEON(0): Display dimensions: (200, 160) mm
[    1.453524] (**) RADEON(0): DPI set to (162, 203)

1280 / 200 * 25.4 = 163 that's fine.
1024 / 160 * 25.4 = 163 as well and not 203... seems it is using height 1280 as 
well.
Anyway, I don't think the DPI reported here is used at all. Can you check what 
xdpyinfo and "xrandr --verbose" reports?


Now for display going standby: 1152x864 works for radeonhd (from attachment 9):
(II) RADEONHD(0): On Crtc 0 Setting 60.0 Hz Mode: Modeline "1152x864"   81.62  
1152 1216 1336 1520  864 865 868 895 -hsync +vsync
so I guess radeon ends up with another vrefresh and timings, but does not tell 
us which in the log. Also here, "xrandr --verbose" output would be useful, but 
is not so easy to acquire. Can you try this:
1. stop X from a console with "sudo /etc/init.d/gdm stop", or boot with "text" 
as kernel parameter
2. run X with:
 xinit -e 'sh -c "xrandr --verbose > xrandr.txt" '
3. check that you got something in xrandr.txt (mind the apostrophes and quotes 
above)
4. now you can restart X with "sudo /etc/init.d/gdm start"

Ideally we should open separate bugs for all these different issues, as
soon as we have singled them out...

-- 
[needs quirk] huge fonts, unusable KDE on ati rs690  
https://bugs.launchpad.net/bugs/320930
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