Comment 45 for bug 391461

The GPU is largely irrelevant (other than being an nVidia card), the bug
stems from an erratum, at least affecting the Intel T2500. The nVidia driver
was relying on certain behaviours in the kernel pertaining to the CPU which
changed in 2.6.30.

2009/9/29 Alex Murray <email address hidden>

> Just wanted to say Nvidia works fine for me under Karmic with compiz on
> my MacBook Pro 5,1:
>
> lspci -v:
> 2:00.0 VGA compatible controller: nVidia Corporation G96 [GeForce 9600M GT]
> (rev a1)
> Subsystem: Apple Computer Inc. Device 00a9
> Flags: bus master, fast devsel, latency 0, IRQ 23
> Memory at a4000000 (32-bit, non-prefetchable) [size=16M]
> Memory at 80000000 (64-bit, prefetchable) [size=256M]
> Memory at a2000000 (64-bit, non-prefetchable) [size=32M]
> I/O ports at 3000 [size=128]
> [virtual] Expansion ROM at a5000000 [disabled] [size=512K]
> Capabilities: <access denied>
> Kernel driver in use: nvidia
> Kernel modules: nvidia, nvidiafb
>
> $ grep flags /proc/cpuinfo
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
> cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm
> constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl vmx
> smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm tpr_shadow vnmi flexpriority
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
> cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm
> constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl vmx
> smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm tpr_shadow vnmi flexpriority
>
> So this clearly doesn't affect all Nvidia users under Karmic.
>
> --
> Compiz Slow on Karmic w/ NVIDIA and 2.6.30 Kernel
> https://bugs.launchpad.net/bugs/391461
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>