Asus G73JW Notebook
Intel Core i7 740QM
nVidia GTX460M 1.5GB
Gentoo Linux x86_64
KDE 4.6.2 + Compiz 0.8.8
Kernel 184.108.40.206 (gentoo-sources), 2.6.39-rcX-gitX
270.x are slower than 260.x
Scrolling in Firefox 4 is erratic, sometimes ok, sometimes choppy.
Even though glxgears is NOT a benchmark...
260.x /w compiz = ~12000fps
270.x /w compiz = ~6000fps
260.x /wo compiz/composite = ~22000fps
270.x /wo compiz/composite = ~10000fps
System under full load, 260.x is excellent and fluid.
System under full load, 270.x is choppy and erratic.
Tried different kernels: 220.127.116.11 and 2.6.39-git
Tried different options: Automatic process group scheduling (ON|OFF)
Tried different xorg-server: 1.9.x and 1.10.x
With NO other changes switching back to 260.x fixes all issues.
nvidia.conf in modprobe.d (tried with none, tried with no MSI, tried with about everything unimaginable).
options nvidia NVreg_DeviceFileMode=432 NVreg_DeviceFileUID=0 NVreg_DeviceFileGID=27 NVreg_ModifyDeviceFiles=1 NVreg_RegistryDwords="PerfLevelSrc=0x2222" NVreg_Mobile=1 NVreg_EnableMSI=1