Created attachment 126304 [details] dmesg -- system architecture: x86_64 -- kernel version: ("uname -r"). 4.8.0-1-drm-intel-nightly -- Linux distribution: archlinux -- Machine or mother board model: Dell XPS 13 9350 -- Display connector: usb-c -> kensington sd4600p -> displayport -> dell P2715q Problem: My laptop turns off displays (both internal and external) after 10 minutes. When I move the mouse or keyboard, the laptop display turns on as expected, but the external monitor stays in sleep mode. Based on what's displaying on my laptop's screen, I can tell that GDM is showing the login window on what it thinks is the external monitor. I can get the external monitor to work at this point by power cycling the Dell P2715Q, which causes it to detect the DP Input. At this point everything works fine until the next time the laptop turns off the displays.
Created attachment 126305 [details] journalctl -f log output
Still happening on the latest drm-intel nightlies. I have to disconnect usb-c or power-cycle my monitor to get my laptop to send input to the external display over displayport.
Hi, Can you tell your finding with a newer kernel?
Still happening on 4.10.0-1-drm-intel-nightly (built on Feb 21). It's been a fairly stable kernel for me, so I've been hesitant to update since then. It might very well be my Kensington SD4600P USB-C dock.
Hi Victor, I was having the same problem on the Kensington SD4600P dock. On HDMI the screens would come back if I moved the mouse on Display Port the DP screen would not wake up unless I powered it off an on again. I am using windows 10. I upgraded the firmware of the dock ----> https://accoblobstorageus.blob.core.windows.net/software/cda1cf8e-d0ae-4611-94df-0a59d60e3f1c.zip Which is a link from Kensingtons website here: https://www.kensington.com/us/us/3693/software-drivers It looks like that has solved the problem. So I would say that it is certainly the dock that is the issue and hopefully the firmware works for you.
Please try current drm-tip branch of https://cgit.freedesktop.org/drm/drm-tip that has commit 9a86cda07af2c63649932f0a4fc757701ef54c42 Author: Jani Nikula <jani.nikula@intel.com> Date: Mon Mar 27 14:33:25 2017 +0300 drm/i915/dp: reduce link M/N parameters
@ryan Thanks - I check the kensington site religious for firmware updates for the sd4600p and have been running that firmware since release. @jani - I have to run drm-intel nightlies for other reasons, which I think should incorporate the changes in drm-tip, correct? I'll build another kernel and see if I can reproduce.
Victor - any news?
based on the lack of activity this bug will be closed... please if the problem is reproducible with latest configuration open a new bug including logs.
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