Comment 27 for bug 525273

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Chris Halse Rogers (raof) wrote : Re: [Bug 525273] Re: nouveau fails to support XV acceleration ION

dmesg output would also be interesting.

I think perhaps that you haven't re-built the initramfs for your kernel,
and as nouveau starts early it's looking for the firmware there, not
finding it, and not looking for it again.

Could you attach dmesg to this bug, and then try again after running
“sudo update-initramfs -u” and rebooting?