Created attachment 141757 [details] 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
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.
I re-tested on latest drm/drm-intel (without patch), this issue is not exist.
Thankyou for your feedback. I will resolve this bug as worksforme.
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
I think the same applies for the upcoming 4.19 as well.
(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.pandiyan@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.pandiyan@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 <glogow@fbihome.de> Date: Sat Aug 25 15:10:35 2018 -0400 drm/i915: Re-apply "Perform link quality check, unconditionally during long pulse"
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.
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