Kernel : [1495.755622] Disabling IRQ #16

Hello,

I just started testing my PC built for LinuxCNC and I got a Kernel message saying : Disabling IRQ #16.

The PC runs a GA-H81M-S2PH motherboard with a G3260, 8Gb DDR3 and linuxcnc-2.7-wheezy.

Everything recommended to be disabled at the level of the BIOS is disabled.

I just changed the grub file : /etc/defaults/grub adding isolcpus=1 between quiet and root delay=5.

And I figured out after several tests that even with nothing loading the PC, i am getting the message and the mouse starting to lag. Tried to change the USB port for the mouse as read on some forums with no success. And I did not find anything related in the posts of the forum.

Thanks for help !!!

Found that the IRQ may be used by two devices in : link

As suggested, I ran : cat /proc/interrupts

And got that on IRQ16 there is : ehci_hcd:usb3 and snd_hda_intel

I seems that the USB interferes with the sound device.

Singularly, I deactivated the sound device as recommended.

Kernel option irqpoll has been used with some success on some systems, tho I do not know the affect this would have on a realtime system.

Glad to see you found a solution and reported back.