I can confirm this issue also with maverick on a Intel 915GM. Just starting xdm after a reboot crashes X with:
[ 158.212] (EE) intel(0): [drm] failed to set drm interface version.
[ 158.212] (EE) intel(0): Failed to become DRM master.
[ 158.212] (**) intel(0): Depth 24, (--) framebuffer bpp 32
[ 158.212] (==) intel(0): RGB weight 888
[ 158.212] (==) intel(0): Default visual is TrueColor
[ 158.212] (II) intel(0): Integrated Graphics Chipset: Intel(R) 915GM
[ 158.212] (--) intel(0): Chipset: "915GM"
[ 158.212] (==) intel(0): video overlay key set to 0x101fe
[ 158.212] (EE) intel(0): failed to get resources: Bad file descriptor
[ 158.212] (EE) intel(0): Kernel modesetting setup failed
Starting kdm, stopping kdm and then starting xdm works as already described before.
I can confirm this issue also with maverick on a Intel 915GM. Just starting xdm after a reboot crashes X with:
[ 158.212] (EE) intel(0): [drm] failed to set drm interface version.
[ 158.212] (EE) intel(0): Failed to become DRM master.
[ 158.212] (**) intel(0): Depth 24, (--) framebuffer bpp 32
[ 158.212] (==) intel(0): RGB weight 888
[ 158.212] (==) intel(0): Default visual is TrueColor
[ 158.212] (II) intel(0): Integrated Graphics Chipset: Intel(R) 915GM
[ 158.212] (--) intel(0): Chipset: "915GM"
[ 158.212] (==) intel(0): video overlay key set to 0x101fe
[ 158.212] (EE) intel(0): failed to get resources: Bad file descriptor
[ 158.212] (EE) intel(0): Kernel modesetting setup failed
Starting kdm, stopping kdm and then starting xdm works as already described before.