[Bug 97204] Can't enable a third monitor even with 3 CRTCs available (1 LVDS, 1 VGA, 1 HDMI/VGA)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97204

--- Comment #5 from Nick Yamane <nick.diego at gmail.com> ---
(In reply to Ville Syrjala from comment #3)
> Created attachment 125537 [details] [review]
> [PATCH] drm/i915: Allow PCH DPLL sharing regardless of  DPLL_SDVO_HIGH_SPEED
> 
> This patch will allow DPLL sharing between VGA and HDMI. However it won't
> help you unless you make both VGA and HDMI use the same exact mode. In your
> log I see the modes were slightly different. So you'll need make sure that
> happens, and then hope that both monitors will sync with the same mode.

Which kernel tree should I use to apply your patch? tried with the mainline one
and got this error:

drivers/gpu/drm/i915/intel_display.c: In function ‘ironlake_compute_dpll’:
drivers/gpu/drm/i915/intel_display.c:8903:6: error: implicit declaration of
function ‘intel_crtc_has_type’ [-Werror=implicit-function-declaration]
      intel_crtc_has_type(crtc_state, INTEL_OUTPUT_ANALOG))
      ^~~~~~~~~~~~~~~~~~~

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