Yep, same problem for me, Ubuntu 11.10 AMD64, Driver version 280.13.  This makes the system unusable.  Every thing lags on the screen.

-Computer-
Processor		: 2x AMD Athlon(tm) 64 X2 Dual Core Processor 3600+
Memory		: 4056MB (893MB used)
Operating System		: Ubuntu 11.10
User Name		: 
Date/Time		: Tue 08 Nov 2011 16:54:53 EST
-Display-
Resolution		: 1600x900 pixels
OpenGL Renderer		: Unknown
X11 Vendor		: The X.Org Foundation
-Multimedia-
Audio Adapter		: HDA-Intel - HDA VIA VT82xx
...
-BIOS-
Date		: 02/21/2008
Vendor		: American Megatrends Inc. (www.ami.com)
Version		: 2101
-Board-
Name		: M2V
Vendor		: ASUSTeK Computer INC. (SEAGATE, www.seagate.com)
...
-PCI Devices-
Host bridge		: VIA Technologies, Inc. K8T890CF Host Bridge
Host bridge		: VIA Technologies, Inc. VT3351 Host Bridge
Host bridge		: VIA Technologies, Inc. VT3351 Host Bridge
Host bridge		: VIA Technologies, Inc. VT3351 Host Bridge
Host bridge		: VIA Technologies, Inc. VT3351 Host Bridge
PIC		: VIA Technologies, Inc. VT3351 I/O APIC Interrupt Controller (prog-if 20 [IO(X)-APIC])
Host bridge		: VIA Technologies, Inc. Device 6238
Host bridge		: VIA Technologies, Inc. VT3351 Host Bridge
PCI bridge		: VIA Technologies, Inc. [K8T890 North / VT8237 South] PCI Bridge (prog-if 00 [Normal decode])
PCI bridge		: VIA Technologies, Inc. K8T890 PCI to PCI Bridge Controller (prog-if 00 [Normal decode])
PCI bridge		: VIA Technologies, Inc. K8T890 PCI to PCI Bridge Controller (prog-if 00 [Normal decode])
PCI bridge		: VIA Technologies, Inc. K8T890 PCI to PCI Bridge Controller (prog-if 00 [Normal decode])
PCI bridge		: VIA Technologies, Inc. K8T890 PCI to PCI Bridge Controller (prog-if 00 [Normal decode])
PCI bridge		: VIA Technologies, Inc. K8T890 PCI to PCI Bridge Controller (prog-if 00 [Normal decode])
IDE interface		: VIA Technologies, Inc. VT8237A SATA 2-Port Controller (rev 80) (prog-if 8f [Master SecP SecO PriP PriO])
IDE interface		: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 07) (prog-if 8a [Master SecP PriP])
USB Controller		: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev a0) (prog-if 00 [UHCI])
USB Controller		: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev a0) (prog-if 00 [UHCI])
USB Controller		: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev a0) (prog-if 00 [UHCI])
USB Controller		: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev a0) (prog-if 00 [UHCI])
USB Controller		: VIA Technologies, Inc. USB 2.0 (rev 86) (prog-if 20 [EHCI])
ISA bridge		: VIA Technologies, Inc. VT8237A PCI to ISA Bridge
Host bridge		: VIA Technologies, Inc. VT8237/8251 Ultra VLINK Controller
PCI bridge		: VIA Technologies, Inc. VT8237A Host Bridge (prog-if 00 [Normal decode])
PCI bridge		: VIA Technologies, Inc. VT8237A PCI to PCI Bridge (prog-if 01 [Subtractive decode])
Host bridge		: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
Host bridge		: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
Host bridge		: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
Host bridge		: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
VGA compatible controller		: nVidia Corporation NV44 [GeForce 7100 GS] (rev a1) (prog-if 00 [VGA controller])
Ethernet controller		: Atheros Communications L1 Gigabit Ethernet (rev b0)
IDE interface		: Marvell Technology Group Ltd. 88SE6121 SATA II Controller (rev b1) (prog-if 8f [Master SecP SecO PriP PriO])
Audio device		: VIA Technologies, Inc. VT8237A/VT8251 HDA Controller (rev 10)