[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 #33 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Carlos Santa from comment #32)
> 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.

Freezes hard enough to not leave a trace in netconsole/serial etc. ? Logs would
be nice.

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