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Old 08-08-2017, 11:58 AM   #1
FrodeJemtland
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Default Kubuntu 17.04, Dell 7480 and Dell D6000 universial dock, disconnecting randomly.

Kubuntu 17.04, Dell 7480 and Dell D6000 universial dock, disconnecting randomly.

I have a new Dell PC, Latitude 7480, connected to a DisplayLink dock named Dell D6000.

At first I had problems with the Intel driver, but managed to fix it with the tips found in the forums.

For the most part things are now working pretty good. There is one last thing that's not working as expected.

From time to time it seems the dock is disconnected, and reconnects, almost at once. The problem is that the external monitors usually stays "disconnected". They are shown in the administration tools for multiple monitors, but they goes to sleep, as if they do not have any signal.

As a fix I have to pull out the USB-C cable to the dock, and reattached it.

Thees "dropps" happens approx 3-10 times during the work day. Sometimes I can work the most of the day without anything happening, sometimes it can happen with only minutes apart.... And do that repeatedly. I can't find a pattern on when this happens, but I do have a hunch that it happens during things that are visually intensive. Scrolling fast on a web page, watching video. Not sure this has anything to do with it, just a hunch.


I have search through the BIOS for any USB values, but can't find any that is of interest for this problem.

I have worked through the post "How to fix your DisplayLink product from repeatedly disconnecting and reconnecting or freezing". But there is a some of the alternatives that has no options in Linux.
1. CHECK IF YOU HAVE THE LATEST DISPLAYLINK SOFTWARE INSTALLED
OK, have 1.3.54.
2. CHECK IF YOU HAVE THE LATEST USB 3.0 HOST CONTROLLER DRIVER INSTALLED ON YOUR PC.
Running kernel Linux-4.10.0-30-generic-x86_64, so I suppose this is where the latest USB 3.0 host controller driver is....
3. CHECK IF YOU HAVE THE LATEST USB HUB FIRMWARE PROGRAMMED ON YOUR PRODUCT
I can only find a Windows driver on Dell's driver download page. No firmware or similar.
4. CHECK IF YOU HAVE THE LATEST BIOS VERSION INSTALLED ON YOUR PC.
I had the 1.4.6 BIOS, but when I upgraded to 1.5.2, the screen flikkered a lot. This behavior disepaired after changing from Modsetting to Intel driver for Xorg.
5. CHECK IF THE SAME BEHAVIOUR IS SEEN WHEN CONNECTED TO A USB 2.0 PORT ON YOUR PC (OR IF NONE IS AVAILABLE WITH A USB 2.0 CABLE)
Do not think I have a 2.0 port on my PC. I'm not sure how to connect a 2.0 USB cable to the Dock, as the USB-C cable is not detachable on the dock.
6. CHECK IF THE SAME BEHAVIOUR IS OBSERVED WITH A DIFFERENT USB CABLE OR USB PORT
See response on point 5. I have also tried to use the non USB-C dongle (Standard USB port), but not sure what I actually is testing by doing so... Problem still excists.
7. TRY A USB 'Y' CABLE (IF YOU ARE USING A USB POWERED MONITOR PRODUCT)
This I have not tried. What is a USB Y cable? We do not have thees at work.
8. TRY CONNECTING YOUR PRODUCT THROUGH AN EXTERNAL MAINS POWERED USB HUB
This I have not tried. Have tried to connect both the D6000 and the PC to separate power cables.
9. DISABLE USB SELECTIVE SUSPEND
Can't find this as a option on Linux, but have tried to sett the usbcore.autosuspend
Tried to sett usbcore.autosuspend=-1 and ausbcore.autosuspend_delay_ms=-1. (should use this last one for Ubuntu versions above 15.03, it seems)
No effect. What speaks against this is that this "dropps" happens when I'm actively working. I have never noticed that it has happened if the machine is not used. It's always OK in the morning, like I left it for the night.

Anyone that has a suggestions for what to try next?

ATTACHMENTS:
HIKT-E7440-LTS_2017-08-08T11:44:07.884309.zip
DLSupportTool file while everything is OK.
What was I doing while this crash happened? Nothing, no crash.

HIKT-E7440-LTS_2017-08-08T13:17:34.473771.zip
DLSupportTool file right after a "dropp". Monitors re-enabled by them self.
What was I doing while this crash happened? Scrolling (with the mouse) on the forum pages of DisplayLink, in the Chrome web browser.

HIKT-E7440-LTS_2017-08-08T13:44:27.775765.zip
DLSupportTool file right after a "dropp". Monitors did now stay disabled.
What was I doing while this crash happened? Was scrolling down a web page with the down arrow on the keyboard.

Last edited by FrodeJemtland; 08-08-2017 at 01:00 PM.
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Old 08-25-2017, 10:50 AM   #2
FrodeJemtland
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Anyone have any idea or tips of anything to try out?

It's still immensely annoying. Have to pull out an plugg inn the USB C cable 5-10 times a day, and the monitors turn off at the most annoying times...
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Old 08-25-2017, 01:22 PM   #3
Toto
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Hello !
I also have a D6000 dock and it seems to happen less frequently when I plug it with USB3 cable. The dmesg log suggest that it may be a power management issue. Indeed, it seems that the kernel tries to suspend all the devices plugged in the dock. I haven't found a solution yet, unfortunately.
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Old 09-11-2017, 02:01 PM   #4
FrodeJemtland
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Tried to upgrade to the last BIOS for my machine. Dell 7x80 v 1.5.8.

The kernel has also been upgraded to 4.10.0-33-generic

Still have the same issue. Not that hard to reproduce. Just watch a Youtube clip. I'm feeling lucky if I can watch it to the end.

In addition the last couple of days I have also experienced that the external monitors some times is not detected. It might be if they are not connected at a reboot. That is a new effect that is not wanted
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