Seems like the server rules out the 1280x1024 modes with no xorg.conf:
II) RADEON(0): Not using default mode "1280x1024" (hsync out of range)
(II) RADEON(0): Not using default mode "1280x1024" (vrefresh out of range)
(II) RADEON(0): Not using default mode "1280x1024" (vrefresh out of range)
You probably need to specify the modelines in your xorg.conf for some reason.
Seems like the server rules out the 1280x1024 modes with no xorg.conf:
II) RADEON(0): Not using default mode "1280x1024" (hsync out of range)
(II) RADEON(0): Not using default mode "1280x1024" (vrefresh out of range)
(II) RADEON(0): Not using default mode "1280x1024" (vrefresh out of range)
You probably need to specify the modelines in your xorg.conf for some reason.