Finally, my Gentoo Linux can run in 1440x900 with x11-driver/xf86-video-radeonhd, without patching
src/rhd_id.c
by hand.The mailing list:
http://lists.opensuse.org/radeonhd/
src/rhd_id.c
by hand.$ emerge -avt media-libs/jpeg
$ aptitude install libjpeg-progs