[Bug 108826] [GLK DSI] Black screen after grub - Ubuntu 18.04 - kernel latest tip 21.11.2018

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108826

--- Comment #59 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
(In reply to Miroslaw from comment #58)
> I tested newest tip kernel and 5.0rc4 - black screen ...
> vbt 915 logs I will attach later today .

It was with PINCTRL_GEMINILAKE=y I suppose? 

If so, can you try to patch intel_dsi_vbt with this patch:

diff --git a/drivers/gpu/drm/i915/intel_dsi_vbt.c
b/drivers/gpu/drm/i915/intel_dsi_vbt.c
index 06a11c35a784..9b3c68a2f75c 100644
--- a/drivers/gpu/drm/i915/intel_dsi_vbt.c
+++ b/drivers/gpu/drm/i915/intel_dsi_vbt.c
@@ -371,7 +371,7 @@ static const u8 *mipi_exec_gpio(struct intel_dsi
*intel_dsi, const u8 *data)
                 vlv_exec_gpio(dev_priv, gpio_source, gpio_number, value);
         else if (IS_CHERRYVIEW(dev_priv))
                 chv_exec_gpio(dev_priv, gpio_source, gpio_number, value);
-       else
+       else if (!IS_GEMINILAKE(dev_priv))
                 bxt_exec_gpio(dev_priv, gpio_source, gpio_index, value);

         return data;

---

With this patch from Jani, I can boot into Ubuntu desktop and
PINCTRL_GEMINILAKE is turned on. However... touchscreen still doesn't work.

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