Bug description: I'm unable to connect monitor through DP on Thinkpad t450s System environment: -- chipset: -- system architecture: x86_64 -- xf86-video-intel: -- xserver: -- mesa: -- libdrm: 2.4.60-2 -- kernel: 3.19.0-15-generic -- Linux distribution: Xubuntu -- Machine or mobo model: Thinkpad t450s -- Display connector: Display Port Reproducing steps: Insert DP cable and error message appears in dmesg. Additional info: Actually I've reported this bug in past and after while it looked like fixed (monitor connection worked without any errors). But after upgrading to newer kernel (I don't know exact version) issue came back.
Created attachment 115437 [details] Xorg.0.log
Created attachment 115438 [details] xrand --verbose
Created attachment 115440 [details] dmesg
Here the link to previously reported bug: https://bugzilla.kernel.org/show_bug.cgi?id=94121
The new dmesg doesn't show any errors... please also use drm.debug=14 module parameter.
Created attachment 115441 [details] kern.log kern.log while I tried to connect and disconnect
Created attachment 115444 [details] dmesg Sorry for old dmesg output. Here's new. PC booted with cable connected, after while I replugged cable again.
Created attachment 115445 [details] dmesg
Hi Vladimír, Sorry for the very late reply. Is there any chance you can retest with a 4.4 kernel? That should contain the following commit, which might make a difference for you. commit 1da7d7131c35cde83f1bab8ec732b57b69bef814 Author: Jani Nikula <jani.nikula@intel.com> Date: Thu Sep 3 11:16:08 2015 +0300 drm/i915: ignore link rate in TPS3 selection
I tested with a thinkpad t450s and HP external monitor and it worked fine. Can you test it with latest kernel?
Hello, I just tried to reproduce the problem with following configuration: BDW-U NUC, emulating eDP with external Display (HP ZR24w) 1920 x 1200 as principal display Attaching a 4k display (3840x2160). Using same command lines: Both are working fine with this software configuration: OS: Ubuntu 16.04 Kernel: 4.7.0 rc2 ++ Date : jun-WW24-01-11:31:29 --> Component : drm url : http://cgit.freedesktop.org/mesa/drm tag : libdrm-2.4.68 commit : fc09c5a author : Kenneth Graunke <kenneth@whitecape.org> age : 6 weeks ago --> Component : mesa url : http://cgit.freedesktop.org/mesa/mesa tag : mesa-11.2.2 commit : 3a9f628 author : Emil Velikov <emil.velikov@collabora.com> age : 4 weeks ago --> Component : xf86-video-intel url : http://cgit.freedesktop.org/xorg/driver/xf86-video-intel tag : 2.99.917 commit : baec802 author : Chris Wilson <chris@chris-wilson.co.uk> age : 1 year 6 months ago --> Component : libva url : http://cgit.freedesktop.org/libva/ tag : libva-1.7.1.pre1 commit : 453876f author : Xiang Haihao <haihao.xiang@intel.com> age : 4 days ago --> Component : vaapi (intel-driver) url : http://cgit.freedesktop.org/vaapi/intel-driver tag : 1.7.1.pre1 commit : 2975480 author : Xiang Haihao <haihao.xiang@intel.com> age : 4 days ago --> Component : cairo url : http://cgit.freedesktop.org/cairo tag : 1.15.2 commit : db8a7f1 author : Bryce Harrington <bryce@osg.samsung.com> age : 6 months ago --> Component : xserver url : http://cgit.freedesktop.org/xorg/xserver tag : xorg-server-1.18.3 commit : 9454cd5 author : Adam Jackson <ajax@redhat.com> age : 9 weeks ago --> Component : intel-gpu-tools url : http://cgit.freedesktop.org/xorg/app/intel-gpu-tools tag : intel-gpu-tools-1.15 commit : 3ce58b6 author : Marius Vlad <marius.c.vlad@intel.com> Please let me know if this configuration works for you
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