I compared the Xorg logs when booting with kernel 2.6.32-22 and -15. In both 
cases, the modelines are scanned fine but under -22 there is an line in 
Xorg.0.log:
(II) intel(0): Not using mode "1280x1024" (bad mode clock/interlace/doublescan)
Later in Xorg.0.log there are several lines like
(II) intel(0): Not using default mode "1680x1050" (exceeds panel dimensions)
(II) intel(0): Not using default mode "840x525" (doublescan mode not supported)
(II) intel(0): Not using default mode "1920x1080" (monitor doesn't support 
reduced blanking)
(II) intel(0): Not using default mode "960x540" (doublescan mode not supported)
(II) intel(0): Not using default mode "1920x1200" (monitor doesn't support 
reduced blanking)
(II) intel(0): Not using default mode "960x600" (doublescan mode not supported)
(II) intel(0): Not using default mode "1920x1440" (exceeds panel dimensions)
(II) intel(0): Not using default mode "960x720" (doublescan mode not supported)
(II) intel(0): Not using default mode "2048x1536" (exceeds panel dimensions)
(II) intel(0): Not using default mode "1024x768" (doublescan mode not supported)
(II) intel(0): Not using default mode "2048x1536" (exceeds panel dimensions)
(II) intel(0): Not using default mode "1024x768" (doublescan mode not supported)
(II) intel(0): Not using default mode "2048x1536" (exceeds panel dimensions)
(II) intel(0): Not using default mode "1024x768" (doublescan mode not supported)

See attachments for details.

** Attachment added: "Xorg.0.log"
   http://launchpadlibrarian.net/50306658/Xorg.0.log

-- 
Regression: screen resolution shrinked when booting into 2.6.32-22 kernel 
https://bugs.launchpad.net/bugs/593568
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