I've found this on https://wiki.gentoo.org/wiki/Radeon, but if it works it means kernel should be recompilated.
Processor type and features ---> [*] MTRR (Memory Type Range Register) support Device Drivers ---> Graphics support ---> If your card sits in an AGP slot, choose your AGP driver, e.g.: <*/M> /dev/agpgart (AGP Support) ---> <*/M> AMD Opteron/Athlon64 on-CPU GART support <*/M> Direct Rendering Manager (XFree86 4.1.0 and higher DRI support) ---> <*/M> ATI Radeon [*] Enable modesetting on radeon by default -*- Support for frame buffer devices ---> < > ATI Radeon display support -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1268229 Title: not HDMI output option (audio) xserver-xorg-video-ati (1:7.2.0-0ubuntu10) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1268229/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs