|Summary:||[KBL-R] USB-C external display doesn't work|
|Product:||DRI||Reporter:||Jason Ekstrand <jason>|
|Component:||DRM/Intel||Assignee:||Intel GFX Bugs mailing list <intel-gfx-bugs>|
|Status:||RESOLVED WORKSFORME||QA Contact:||Intel GFX Bugs mailing list <intel-gfx-bugs>|
|i915 platform:||KBL||i915 features:||display/USB-C|
Description Jason Ekstrand 2019-04-01 15:47:14 UTC
Everything worked fine on 4.18 and 4.19 was ok but fickle. As of 4.20, GNOME shell won't recognize the external display at all. I plug it in and the main laptop screen goes black and the monitor continues to be in power-save mode. If I unplug, everything goes back to normal on my laptop. Maybe the link just never trains? I've tried with two different Dell monitors with two different USB-C HDMI adapters (Cabel Matters and a Kensington dock) and with and without my KVM switch. None of it makes a difference. Hardware: Dell XPS 13 9360 (KBL-R) Kernel: 4.19.13 is okish, 4.20.15 and 5.0.4 are broken. All kernels are Fedora builds Userspace: Fedora 29 with GNOME Wayland, everything updated
Comment 1 Lakshmi 2019-04-02 07:19:58 UTC
Can you please try to reproduce the issue using drm-tip (https://cgit.freedesktop.org/drm-tip) and kernel parameters drm.debug=0x1e log_buf_len=4M, and if the problem persists attach the full dmesg from boot.
Comment 2 Lakshmi 2019-05-02 11:46:10 UTC
Jason, any updates from drmtip?
Comment 3 Jason Ekstrand 2019-05-02 13:56:59 UTC
It doesn't work with drm-tip but I also haven't sat down and gotten logs. The one update I do have is that I bought a new dock and it works fine. I think it has something to do with the fact that my old dock supported both HDMI and displayport and did internal MST.
Comment 4 Lakshmi 2019-05-29 11:27:53 UTC
(In reply to Jason Ekstrand from comment #3) > It doesn't work with drm-tip but I also haven't sat down and gotten logs. > The one update I do have is that I bought a new dock and it works fine. I > think it has something to do with the fact that my old dock supported both > HDMI and displayport and did internal MST. We need dmesg log from drmtip to investigate the issue. Can you please re-test with latest drmtip and attach the logs? This will speed up the investigation.
Comment 5 Lakshmi 2019-07-02 06:25:49 UTC
Need latest logs from drm-tip to investigate the issue. No feedback for more than a month, closing as resolved works for me. Please re-open if issue persists with latest drm-tip https://cgit.freedesktop.org/drm-tip and send dmesg from boot with kernel parameters drm.debug=0x1e log_buf_len=4M?