[Bug 65995] [HSW mobile Acer notebook] eDP can't light up in boot to text mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65995

shui yangwei <yangweix.shui at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW
           Assignee|tprevite at gmail.com          |yangweix.shui at intel.com

--- Comment #26 from shui yangwei <yangweix.shui at intel.com> ---
Created attachment 85943
  --> https://bugs.freedesktop.org/attachment.cgi?id=85943&action=edit
dmesg: eDP can't light up and there's error && call trace

(In reply to comment #25)
> What happens if you try this patch?
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c
> b/drivers/gpu/drm/i915/intel_dp.c
> index 8c70a83..df49828 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -795,11 +795,6 @@ intel_dp_compute_config(struct intel_encoder *encoder,
>         /* Walk through all bpp values. Luckily they're all nicely spaced
> with 2
>          * bpc in between. */
>         bpp = pipe_config->pipe_bpp;
> -       if (is_edp(intel_dp) && dev_priv->vbt.edp_bpp) {
> -               DRM_DEBUG_KMS("clamping bpp for eDP panel to BIOS-provided
> %i\n",
> -                             dev_priv->vbt.edp_bpp);
> -               bpp = min_t(int, bpp, dev_priv->vbt.edp_bpp);
> -       }
> 
>         for (; bpp >= 6*3; bpp -= 2*3) {
>                 mode_rate = intel_dp_link_required(adjusted_mode->clock,
> bpp);


Applying this patch on latest -next-queued kernel, this issue also exists. I
append the dmesg here.

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