linux-kernel - Re: [PATCH] drm/i915: Ignore OpRegion panel type on Ivy Bridge + Mobile

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Date:   Tue, 13 Sep 2016 12:34:08 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Adrien Vergé <adrienverge@...il.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Adrien Vergé <adrienverge@...il.com>
Subject: Re: [PATCH] drm/i915: Ignore OpRegion panel type on Ivy Bridge + Mobile

On Sun, 11 Sep 2016, Adrien Vergé <adrienverge@...il.com> wrote:
> On Terra Mobile Ultrabook 1450 II (Core i5-3337U, i915 devid = 0x166),
> the screen is tiled in many 480×320 screens (like a mosaic) since v4.7.
> This laptop is simply unusable.
>
> I have bisected the cause to commit a05628195a0d ("drm/i915: Get
> panel_type from OpRegion panel details").
>
> Like for Skylake, it seems that using the OpRegion panel type (here, 0)
> causes the problem, whereas the VBT panel type (here, 7) gives a normal
> display. See commit aeddda06c1a7 ("drm/i915: Ignore panel type from
> OpRegion on SKL") for background on this Skylake fix.
>
> This patch ignores OpRegion panel type for Ivy Bridge + Mobile chips.

Please try this patch [1] instead, and reply to it if it works for you.

BR,
Jani.

[1] http://patchwork.freedesktop.org/patch/msgid/1473758539-21565-1-git-send-email-ville.syrjala@linux.intel.com

>
> Tested-by: Adrien Vergé <adrienverge@...il.com>
> Signed-off-by: Adrien Vergé <adrienverge@...il.com>
> ---
>  drivers/gpu/drm/i915/intel_opregion.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
> index adca262..94e2db7 100644
> --- a/drivers/gpu/drm/i915/intel_opregion.c
> +++ b/drivers/gpu/drm/i915/intel_opregion.c
> @@ -1083,5 +1083,16 @@ intel_opregion_get_panel_type(struct drm_i915_private *dev_priv)
>  		return -ENODEV;
>  	}
>  
> +	/*
> +	 * FIXME On Terra Mobile Ultrabook 1450 II (Intel Core i5-3337U) the
> +	 * OpRegion panel type (0) results in tiled ("mosaic") display bug,
> +	 * whereas the VBT panel type (7) gives a normal display.
> +	 * Let's ignore the OpRegion panel type for this chip.
> +	 */
> +	if (IS_IVYBRIDGE(dev_priv) && IS_MOBILE(dev_priv)) {
> +		DRM_DEBUG_KMS("Ignoring OpRegion panel type (%d)\n", ret - 1);
> +		return -ENODEV;
> +	}
> +
>  	return ret - 1;
>  }

-- 
Jani Nikula, Intel Open Source Technology Center