[Bug 111219] [CI][DRMTIP] igt at kms_chamelium@hdmi-hpd-storm - dmesg-warn - Received HPD interrupt on pin 9 although disabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111219

--- Comment #3 from emersion <contact at emersion.fr> ---
Seems like a kernel bug in HPD storm handling. The driver correctly falls back
to polling, but then errors because of an HPD interrupt. Note that this happens
on USB-C, which might be relevant:

<7> [71.911207] [drm:__intel_tc_port_lock [i915]] Port F/TC#4: TC port mode
reset (dp-alt -> tbt-alt)

User impact: seems like the driver ends up in a bad state, which could result
in a blank screen when a monitor with e.g. a bad cable is connected via USB-C.

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