[Bug 193500] Interrupt storm after loading i915kms module on Gen4 Intel GPU

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193500

--- Comment #9 from jan.kokemueller at gmail.com ---
So to clarify, setting "hw.drm.msi=0" is fine as a workaround. When hw.drm.msi
is set to 1, I have to do one suspend/resume cycle for the interrupts on irq16
to stop. Then the GPU uses irq260.

hw.drm.msi=1 (after suspend/resume):
interrupt                          total       rate
irq1: atkbd0                        2085          2
irq9: acpi0                        15696         18
irq12: psm0                        85609        100
irq14: ata0                        21899         25
irq15: ata1                          594          0
irq16: uhci0                     3080356       3619
irq20: hpet0                      171708        201
irq23: uhci3 ehci1                   168          0
irq256: hdac0                        113          0
irq258: iwn0                       42571         50
irq259: re0                           24          0
irq260: vgapci0                    33092         38
Total                            3453915       4058

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