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Old 07-21-11, 06:51 PM   #2
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cheechr1's Avatar
Join Date: Nov 2010
Posts: 94
Default Re: Ubuntu 11.04 HPC with Z68/i7-2600k Mobo and Multiple Nvidia GTX cards

1st issue you have:

I had this issue as well when I installed three GTX480's, also pretty much for GPU computing.

What worked for me was adding vmalloc=256M to my grub line in my current kernel. Example:

In your grub.cfg in the /boot/grub folder you will see a line similar to this:

menuentry 'Ubuntu, with Linux 2.6.38-10-generic-pae' --class ubuntu --class gnu-linux --class gnu --class os {
set gfxpayload=$linux_gfx_mode
insmod part_msdos
insmod ext2
set root='(/dev/sda,msdos1)'
search --no-floppy --fs-uuid --set=root 04f18a36-ca87-46e9-9705-1c7335a2c74a
linux /boot/vmlinuz-2.6.38-10-generic-pae root=UUID=04f18a36-ca87-46e9-9705-1c7335a2c74a ro quiet splash vt.handoff=7 vmalloc=256M
initrd /boot/initrd.img-2.6.38-10-generic-pae

Thats what allowed the driver to work for my cards. Notice where the vmalloc line is? The bunk thing about using this line in this way is that you have to check after everytime you think something may have messed with grub.cfg that your latest default kernel has this line or your cards wont work.

You should get pyrit from the repos to check if your cards are identified, it will probably be the easiest.

That should also solve your #2 problem, making the cards known to the system. Peace

P.S. heres a link to fix the GCC 4.5 and Cuda compilation junk cause I had that issue, right here:
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