What I see here is that for 2.6.27 you use the VESA framebuffer
while you do not use it for the 2.6.28

Compare your configs:
2.6.27 : CONFIG_FB_VESA=y
2.6.28: # CONFIG_FB_VESA is not set

This is intentional.  Reason is that in 2.6.28 option
`CONFIG_FB_BOOT_VESA_SUPPORT' has been added, and it seems that this
change introduced a bug.

My advice is try using the Intel framebuffer (change it to Y not 'M'
like module).  It should be faster than VESA on your hardware.
Unselect VESA.

I'm doing a git bisect right now to find out why
CONFIG_FB_BOOT_VESA_SUPPORT doesn't work as advertised.


    Werner

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