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On 2018-09-27T07:36:16+00:00 Shun Terabayashi wrote:

Created attachment 141757
full dmesg

Kernel is 4.18.8, 4.18.9(Arch), mainline(AUR), and 
drm/drm-intel(https://github.com/shunonymous/aur-linux-drm-intel-git).
My laptop displays nothing in builtin monitor when launching Wayland 
compositor.(weston, mutter)
It displays by connecting or disconnecting external monitor (by HDMI) (mutter. 
weston doesn't work).
startx works without any problem.

I tried to revert
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=399334708b4f07b107094e5db4a390f0f25d2d4f
on mainline, this symptom was disappeared.


Machine: Razer Blade Stealth (2016 Later, UHD Model, w/o any eGPU)
External Display: LG 27UD88-W (3840x2160) connected with HDMI
OS: Arch Linux

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797881/comments/0

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On 2018-10-02T05:58:02+00:00 Lakshminarayana-vudum wrote:

Shun, Can you apply following path and test if the issue is still existing?
(https://bugs.freedesktop.org/attachment.cgi?id=141229).

If the issue persists, send dmesg from boot with kernel parameters
drm.debug=0x1e log_buf_len=4M. This way we know more information about
the bug.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797881/comments/1

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On 2018-10-02T16:30:23+00:00 Shun Terabayashi wrote:

I re-tested on latest drm/drm-intel (without patch), this issue is not
exist.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797881/comments/2

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On 2018-10-03T07:12:12+00:00 Lakshminarayana-vudum wrote:

Thankyou for your feedback. I will resolve this bug as worksforme.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797881/comments/3

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On 2018-10-20T19:35:42+00:00 Karolherbst-g wrote:

this is actually an issue on the 4.18.8 and newer.

Those commits need to be applied to 4.18 to fix this regression:

9ebd8202393dde9d3678c9ec162c1aa63ba17eac
f24f6eb95807bca0dbd8dc5b2f3a4099000f4472

regression was caused by

399334708b4f07b107094e5db4a390f0f25d2d4f

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797881/comments/14

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On 2018-10-20T19:37:42+00:00 Karolherbst-g wrote:

I think the same applies for the upcoming 4.19 as well.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797881/comments/15

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On 2018-10-23T11:28:57+00:00 Jani-nikula wrote:

(In reply to Karol Herbst from comment #4)
> this is actually an issue on the 4.18.8 and newer.
> 
> Those commits need to be applied to 4.18 to fix this regression:
> 
> 9ebd8202393dde9d3678c9ec162c1aa63ba17eac

commit 9ebd8202393dde9d3678c9ec162c1aa63ba17eac
Author: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
Date:   Thu Sep 27 13:57:30 2018 -0700

    drm/i915/dp: Fix link retraining comment in intel_dp_long_pulse()

> f24f6eb95807bca0dbd8dc5b2f3a4099000f4472

commit f24f6eb95807bca0dbd8dc5b2f3a4099000f4472
Author: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
Date:   Thu Sep 27 13:57:31 2018 -0700

    drm/i915/dp: Restrict link retrain workaround to external monitors

> regression was caused by
> 
> 399334708b4f07b107094e5db4a390f0f25d2d4f

commit 399334708b4f07b107094e5db4a390f0f25d2d4f
Author: Jan-Marek Glogowski <glo...@fbihome.de>
Date:   Sat Aug 25 15:10:35 2018 -0400

    drm/i915: Re-apply "Perform link quality check, unconditionally
during long pulse"

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797881/comments/16

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On 2018-11-02T09:31:48+00:00 Jani-nikula wrote:

The commits are headed upstream and tagged with appropriate tags to be
backported to stable kernels. Please let us know if the fixes don't show
up in v4.18 in a few weeks.

Thanks for the report, closing.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797881/comments/17


** Changed in: linux
       Status: Unknown => Fix Released

** Changed in: linux
   Importance: Unknown => Medium

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Title:
  Display goes blank soon after boot on dell xps13 on linux-
  image-4.18.0-10-generic

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