[Bug 97994] [REGRESS] [BISECT] [i915] Monitor resolution lost

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97994

--- Comment #5 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Daniel Otero from comment #3)
> Yes, between the monitor and the motherboard there's only a HDMI cable. I'm
> not aware of any kind of adaptor inside the motherboard, if that's of any
> help.
> 
> I just booted the freshly compiled "dp_dual_mode_type2_broken" branch (as of
> 02676478a756db9395df0eb8387c40c887fd450d) and the problem persists.
> 
> Enabling "drm.debug=0x4" in kernel comand line, I saw a line that may means
> more to you that it does to me:
> 
> [    0.697620] [drm:intel_hdmi_set_edid [i915]] Assuming DP dual mode
> adaptor presence based on VBT
> [    0.697649] [drm:intel_hdmi_set_edid [i915]] DP dual mode adaptor (type 1
> DVI) detected (max TMDS clock: 165000 kHz)
> ...

Ah. So my VBT heuristic is the problem here. Please attach a copy of
/sys/kernel/debug/dri/0/i915_opregion

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