[Intel-gfx] E6510: Black screen on resume with 3.2-rc

[Jin, Gordon]

> -----Original Message-----
> From: intel-gfx-bounces+gordon.jin=intel.com at lists.freedesktop.org
> [mailto:intel-gfx-bounces+gordon.jin=intel.com at lists.freedesktop.org] On
> Behalf Of Hette Visser
> Sent: Friday, November 25, 2011 2:42 AM
> To: intel-gfx at lists.freedesktop.org
> Subject: [Intel-gfx] E6510: Black screen on resume with 3.2-rc
> 
> Hi,
> 
> with kernel 3.2-rc the DP of my Dell E6510 stays black on resume,
> while the attached monitor doesn't.
> 
> I've bisected this and the following change in commit
> cd9dde44f47501394b9f0715b6a36a92aa74c0d0 introduced this problem:
> 
> intel_dp.c:
> @@ -195,7 +211,7 @@ intel_dp_link_required(struct drm_device *dev,
> struct intel_dp *intel_dp, int pi
>        if (intel_crtc)
>                bpp = intel_crtc->bpp;
> 
> -       return (pixel_clock * bpp + 7) / 8;
> +       return (pixel_clock * bpp + 9) / 10;
>  }

Thanks for the bisect. This looks related to https://bugs.freedesktop.org/show_bug.cgi?id=42263.

Gordon