[Nouveau] [Bug 97367] New: k520 card produce high volume of IRQ

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97367

            Bug ID: 97367
           Summary: k520 card produce high volume of IRQ
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: mmaret at genymobile.com
        QA Contact: xorg-team at lists.x.org

Created attachment 125818
  --> https://bugs.freedesktop.org/attachment.cgi?id=125818&action=edit
dmesg

Amazon propose computer with k520(GK104) GPU for virtualisation (Xen).
You can use Ubuntu LTS on it for example.
When inserting the nouveau driver, /proc/interrupts report that nvkm is doing
~100000 interrupts/sec.

This have been tested on kernel 4.4.0 and 4.4.13.

On amazon, you do not control the real hardware where your system will be run.
It appear that sometimes, this issue do not happen. May be this could be due to
vbios version ?

Forcing nouveau in headless mode (modeset=2) produce a normal amount of IRQ.

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