[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

wolfgang at lyxys.ka.sub.org changed:

           What    |Removed                     |Added
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                 CC|                            |wolfgang at lyxys.ka.sub.org

--- Comment #23 from wolfgang at lyxys.ka.sub.org ---
Same problem happens on a Lenovo T500 with a recent 10.1-STABLE. That machine
also uses Intel GM45 graphics.
Apparently I misunderstood how to disable msi for drm: Adding hw.drm.msi=0 to
/boot/loader.conf just results in an error message about an unknown oid,
kldload i915kms after that still results in 1 MSI being assigned and interrupts
coming in on irq16

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