On Sun, 11 Sep 2016, Adrien Vergé <adrienverge@xxxxxxxxx> 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@xxxxxxxxxxxxxxx
>
> Tested-by: Adrien Vergé <adrienverge@xxxxxxxxx>
> Signed-off-by: Adrien Vergé <adrienverge@xxxxxxxxx>
> ---
> 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
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