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Old 11-15-2018, 04:45 PM   #1
steve-o
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Default Monitors-periodically-turn-off on Ubuntu 18.04

Dual boot Dell laptop with Dell 6000 dock; The attached LG monitors periodically turn off on Ubuntu; attached output from DL Support tool.

The monitors turn off after 30 minutes or so, even when Power and Privacy settings indicate they should never go to sleep.

Had this issue with an upgraded version of Ubuntu 16 -> 18. Now also occuring with clean install of 18.04. Have tried uninstalling and reinstalling the DisplayLink driver with no success.

Unplugging the dock from the laptop does not cause the laptop to recognise the change; in Display settings it still shows the monitors as connected.

Dock only seems to recognise the monitors from a clean boot.
Attached Files
File Type: zip DLSupportTool_Output_2018-11-15T16:26:28.747386.zip (1.46 MB, 0 views)
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Old 11-16-2018, 12:05 AM   #2
schadsey
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Default

I recently upgraded from Xubuntu 17.10 to 18.04 and have started seeing something similar. My system is a Dell Latitude 5580 that is connected to a Dell D6000 docking station via USB-C. I posted the following in https://bugs.launchpad.net/ubuntu/bi...x/+bug/1763594 but I don't know for sure if that bug is what is going on here.



Quote:
I've been getting similar disconnects on a Dell Latitude 5580 that is connected to a Dell D6000 docking station via USB-C. I'm also using DisplayLink driver version 4.4.24 (https://www.displaylink.com/downloads/ubuntu) in order to connect to two external displays. With Ubuntu 17.10 I was not seeing any disconnects. With 18.04 I see at least one per day where the external monitors go dark, and these messages in syslog:

Nov 13 10:26:39 steveclx5580 kernel: usb 3-1: USB disconnect, device number 2
Nov 13 10:26:39 steveclx5580 kernel: usb 3-1.2: USB disconnect, device number 3
Nov 13 10:26:39 steveclx5580 kernel: usb 3-1.2.2: USB disconnect, device number 5
Nov 13 10:26:39 steveclx5580 kernel: xhci_hcd 0000:3d:00.0: xHCI host controller not responding, assume dead
Nov 13 10:26:39 steveclx5580 kernel: xhci_hcd 0000:3d:00.0: HC died; cleaning up
Nov 13 10:26:39 steveclx5580 kernel: usb 4-1: USB disconnect, device number 2
Nov 13 10:26:39 steveclx5580 kernel: usb 4-1.1: USB disconnect, device number 3
Nov 13 10:26:39 steveclx5580 kernel: cdc_ncm 4-1.1:1.5 enx9cebe8551508: unregister 'cdc_ncm' usb-0000:3d:00.0-1.1, CDC NCM
Nov 13 10:26:39 steveclx5580 NetworkManager[1089]: <info> [1542122799.4322] device (enx9cebe8551508): state change: unavailable ->
unmanaged (reason 'removed', sys-iface-state: 'removed')

This morning I tried the linux-oem package based on comments in this bug report.
$ uname -a
Linux steveclx5580 4.15.0-1024-oem #29-Ubuntu SMP Tue Oct 16 08:14:23 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

I am still seeing disconnects, and they are more frequent than before:

Nov 14 10:43:46 steveclx5580 kernel: usb 3-1: USB disconnect, device number 2
Nov 14 10:43:46 steveclx5580 kernel: usb 3-1.2: USB disconnect, device number 3
Nov 14 10:43:46 steveclx5580 kernel: usb 3-1.2.2: USB disconnect, device number 5
Nov 14 10:43:46 steveclx5580 kernel: xhci_hcd 0000:3d:00.0: xHCI host controller not responding, assume dead
Nov 14 10:43:46 steveclx5580 kernel: xhci_hcd 0000:3d:00.0: HC died; cleaning up
Nov 14 10:43:46 steveclx5580 kernel: usb 4-1: USB disconnect, device number 2
Nov 14 10:43:46 steveclx5580 kernel: usb 4-1.1: USB disconnect, device number 3
Nov 14 10:43:46 steveclx5580 kernel: cdc_ncm 4-1.1:1.5 enx9cebe8551508: unregister 'cdc_ncm' usb-0000:3d:00.0-1.1, CDC NCM
Nov 14 10:43:46 steveclx5580 upowerd[2272]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:1c.4/0000:05:00.0/0000:06:
02.0/0000:3d:00.0/usb4/4-1/4-1.1/4-1.1:1.1
Nov 14 10:43:46 steveclx5580 upowerd[2272]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:1c.4/0000:05:00.0/0000:06:
02.0/0000:3d:00.0/usb4/4-1/4-1.1/4-1.1:1.0
Nov 14 10:43:46 steveclx5580 dhclient[3858]: receive_packet failed on enx9cebe8551508: Network is down

I do regularly suspend/resume this laptop, but the latest disconnects have happened without a prior resume.
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Old 11-21-2018, 05:10 PM   #3
john1111
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The solution was found here for me (on Ubuntu 18.10 with Dell XPS13 and D6000 dock)

https://www.displaylink.org/forum/sh...t=65476&page=2

Quote:
#### Disable audio suspend
* `sudo gedit /etc/pulse/default.pa`. Comment out the line indicated below.

```
### Automatically suspend sinks/sources that become idle for too long
# load-module module-suspend-on-idle
```
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Old 11-27-2018, 01:51 PM   #4
adin
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Default I'm experiencing the same problem

I'm on a Dell Inspiron 15, and I'm experiencing the same problem. Random blackouts on the monitors. Unplugging and plugging the dock back solves the problem but it is annoying.

Any solutions?
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