Booting Karmic on the Ubuntu 2.6.31-11.38-generic kernel with working video, 
karmic beta is using the Xorg driver.
Excerpted from the /var/log/Xorg.0.log file:
-------------------------------
...
II) LoadModule: "ati"
(II) Loading /usr/lib/xorg/modules/drivers//ati_drv.so
(II) Module ati: vendor="X.Org Foundation"
        compiled for 1.6.3, module version = 6.12.99
        Module class: X.Org Video Driver
        ABI class: X.Org Video Driver, version 5.0
(II) LoadModule: "radeon"
(II) Loading /usr/lib/xorg/modules/drivers//radeon_drv.so
(II) Module radeon: vendor="X.Org Foundation"
        compiled for 1.6.3, module version = 6.12.99
        Module class: X.Org Video Driver
        ABI class: X.Org Video Driver, version 5.0
(II) RADEON: Driver for ATI Radeon chipsets:
        ATI Radeon Mobility X600 (M24) 3150 (PCIE), ATI FireMV 2400 (PCI),
        ATI Radeon Mobility X300 (M24) 3152 (PCIE),
...
------------------------------

lspci -vv shows:
------------------------------
01:05.0 VGA compatible controller: ATI Technologies Inc RS690M [Radeon X1200 
Series]
        Subsystem: Toshiba America Info Systems Device ff1a
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 64, Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 18
        Region 0: Memory at f0000000 (64-bit, prefetchable) [size=128M]
        Region 2: Memory at f8100000 (64-bit, non-prefetchable) [size=64K]
        Region 4: I/O ports at 9000 [size=256]
        Region 5: Memory at f8000000 (32-bit, non-prefetchable) [size=1M]
        Capabilities: <access denied>
        Kernel modules: radeon
-----------------------

So I'm going to nominate this as a real regression.

** Changed in: linux-meta (Ubuntu)
       Status: Incomplete => New

-- 
ubuntu karmic beta - ATI video failure on boot with kernel 2.6.31-13
https://bugs.launchpad.net/bugs/449251
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