[Bug 66516] [845g regression] No output on LVDS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66516

--- Comment #14 from Daniel Vetter <daniel at ffwll.ch> ---
On Sat, Jul 6, 2013 at 7:24 PM,  <bugzilla-daemon at freedesktop.org> wrote:
> https://bugs.freedesktop.org/show_bug.cgi?id=66516
>
> --- Comment #13 from Chris Wilson <chris at chris-wilson.co.uk> ---
> Remaining hack required to lit up the LVDS:
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_d
> index 2fedc3e..bab3a52 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -10212,6 +10212,11 @@ static void intel_sanitize_crtc(struct intel_crtc
> *crtc
>                         encoder->base.crtc = NULL;
>                 }
>         }
> +
> +       if (!crtc->active) {
> +               crtc->active = true;
> +               intel_crtc_disable(crtc);
> +       }
>  }
>
>  static void intel_sanitize_encoder(struct intel_encoder *encoder)

Hm, since the pipe A quirk in effect this just means that we leave pll
and pipe running, but kill everything else. Which probably means we've
broken a subtile ordering constraint somewhere recently ... no idea
what yet.
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

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