Red Hat Bugzilla – Bug 1291117
4.4 rc4 system hang on suspend/shutdown after external monitor attached/detached via usb-c DP mode
Last modified: 2017-08-08 08:31:13 EDT
Created attachment 1105430 [details]
Description of problem:
After attaching an external monitor to an intel skylake laptop (dell xps 13 9350) via the usb-c port with a usb-c to hdmi adapter and attempting to suspend or shutdown the laptop hangs the system.
Version-Release number of selected component (if applicable):
Fedora 23 x64
Kernel: 4.4.0-0.rc4.git3.2.fc24.x86_64 #1 SMP Thu Dec 10 20:13:41 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Steps to Reproduce:
1. Connect external monitor
2. Disconnect (or not) external monitor
3. Shutdown or suspend laptop
System would shutdown properly, or suspend properly.
System shutdown or suspend works properly if an external monitor is not attached.
Attached journalctl -k -b -1 with trace.
I own the similar Dell XPS 15 9550 and can confirm this issue. Moreover it is not restricted to external monitors but actually happend with everything plugged into the USB Type C port. I tested to connect the following devices:
- Nexus 5x
- USB 3.1 Type C Ethernet Adapter
- Type C to VGA Adapter (without connected monitor)
- USB 3.1 Type C to USB 3.0 Type A female Adapter (without connected device)
Especially the Type C->A Adapter is a totally dumb device. This leads me to conclusion that this is a general problem with the Type C port and not related to the connected device.
I don't know if this is the same issue as Steve has, it would be nice if you (Steve) can verify if other (non-graphics) USB Type C devices work for you.
Unfortunately I don't own any other USB-C devices to test with.
But I can confirm that there is no requirement for the external monitor to be connected to the adapter for this issue to occur.
This bug appears to have been reported against 'rawhide' during the Fedora 24 development cycle.
Changing version to '24'.
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