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Old 04-16-08, 09:10 AM   #1
corneliusx
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Join Date: Apr 2008
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Default NVS 440 PCI-e x4 instead of x16

System description:
Dual Quad-Core Intel® Xeon® processor E5440
Intel 5000x chipset (all PCI-e slots driven by this chip)
4GB Ram
NVS 440 (256 MB)

OS: Linux RED HAT Enterprise 4 (Update 4)

nVIDIA driver: NVIDIA-Linux-x86-173.08

The driver detect NVS 440 board on a PCI-e x4 bus, while same hardware detect x16 using windows.

Added boot parameter "pci=nommconf" to eliminate NVRM MMCONFIG warning. Anyway same behaviour.

Does anybody know how to approach this bad behaviour?
I'm lost, please help me!!!

Many Thanks in advance
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Old 04-16-08, 10:59 AM   #2
pe1chl
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Default Re: NVS 440 PCI-e x4 instead of x16

same hardware detect x16 using windows

the same system? or similar system?
make sure your card is firmly seated in the slot.
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Old 04-16-08, 11:23 AM   #3
corneliusx
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Default Re: NVS 440 PCI-e x4 instead of x16

Yes, hardware is just the same. Windows XP (latest update) has been installed into another HD, same model of the one used for RHES 4.6 installation.
Basically, NVS 440 show same performace of NVS 285, where paper shows a different story....
I had a look to nvidia-settings code; bus type and bus rate are retourned from NvCtrlGetAttribute function. Because of a good behaviour under windows, and even if I'm not so "close" to the PCI-e stuff even for Linux, I feel to say that linux kernel and/or driver itself couses this behaviour, don't you agree?

Many thanks for any reply

Corny
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Old 04-16-08, 12:09 PM   #4
pe1chl
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Default Re: NVS 440 PCI-e x4 instead of x16

I only mentioned it because I had the same problem when I assembled my system and it was caused by the card not being firmly seated in the slot.
You can see the kernel idea of the bus by doing: lspci -vv
The link width is shown as part of the data, first look for the section for the video card.

When it is wrong there too, I suspect it is a BIOS problem that Windows somehow works around. Update the BIOS.
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