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[Christoph Buchner <996008@xxxxxxxxxxxxxxxxxx>]

For the record, I have tried booting with the irqpoll option, does not
help.

Doing echo 'options nvidia NVreg_EnableMSI=1' >
/etc/modprobe.d/nvidia.conf as recommended in that post you linked does
apparently not activate MSI for nvidia as intended. There was no file
with that name in that directory, but several otehr nvidia* files
(nvidia-current-updates_hybrid.conf, nvidia-current_hybrid.conf, nvidia-
graphics-drivers.conf). I did not know which one to add that option to,
if necessary.

However, using dmesg | grep MSI to check for enabled MSI, the following drew my attention: 
hda_intel: Disabling MSI
hda_intel is one of the modules which conflicts on irq11, I think (/proc/interrupts says on 11: ohci_hcd:usb2, snd_hda_intel, nvidia), so I'll further investigate. I have a theory that on precise, the MSI for the sound driver has been disabled for some reason, creating this conflict in the first place.

I have to be a bit careful about wildly changing system settings, as
this is a production machine and I can't currently afford to lose it for
an extended period of time if I have to nuke the system and reinstall or
whatever.

-- 
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packagers, which is subscribed to compiz in Ubuntu.
https://bugs.launchpad.net/bugs/996008

Title:
  GUI slows down significantly after random period of time.

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