[Bug 97666] Kernel "NULL pointer dereference" with MST monitor on HSW

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97666

--- Comment #32 from Carlos Santa <carlos.santa at intel.com> ---
Hi Ville,

I tested the following 3 patches on today's drm-nightly:

1. drm/i915: Refresh that status of MST capable connectors in ->detect()
2. drm/fb-helper: Fix connector ref leak on error
3. drm/fb-helper: Keep references for the current set of used connectors

You're right, after applying #1, the null pointer issue comes back but after
applying #2, and doing the display power on/off to repro the bug, the system
freezes and never comes back again. Same behavior if then applying patch #3 on
top, which is supposed to be the fix.

Carlos

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