Created attachment 113816 [details]
dmesg.log which shows the warnings
This has been discussed in http://lists.freedesktop.org/archives/intel-gfx/2015-February/059291.html , filing it here so it can be better tracked.
Beginning with kernel 3.19-rc1, there are warnings generated by the i915 from the function intel_check_page_flip. A dmesg log from boot to the problem with `drm.debug=13` is attached. This only happens when booting with threaded IRQs enabled by the `threadirqs` kernel flag.
As pointed out on the mailing lists, this is probably caused because in_irq() only tests for real hardware interrupts, not threaded ones. Further information here: http://lists.freedesktop.org/archives/intel-gfx/2015-February/059623.html
Distro: Arch Linux
Machine: Asus Zenbook UX32VD (Intel HD4000 graphics)
Author: Dave Gordon <email@example.com>
Date: Fri Mar 6 15:34:26 2015 +0000
drm/i915: use in_interrupt() not in_irq() to check context
in drm-intel-fixes. Thanks for the report.