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Old 11-12-2018, 10:33 AM   #1
peda
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Default DisplayLink connected screens turn black every few minutes after driver update

I've updated to DisplayLink Driver 4.4.24 and do regret it ... every few minutes (in most cases between 2 and 15 minutes, very rarely after 4 hours) the screens connected with DisplayLink turn black. In most cases it does help to unplug the DisplayLink USB-Connector and plug it back in again ... but sometimes I need to restart my computer ... super annoying.

I'm running Ubuntu 16.04 on a Dell Insiprion 5579 with a Dell Universal Dock D6000.
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File Type: zip DLSupportTool_Output_2018-11-12T11:27:54.348993.zip (1.14 MB, 2 views)
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Old 11-12-2018, 12:47 PM   #2
peda
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I've just tried to upload another debug output right after the issue happened again, but I'm always getting the following error message:

Code:
Your submission could not be processed because a security token was missing.

If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error.
Please let me know if there is another way I can send you this debug file

The other debug output can be downloaded here: http://ns342841.ip-37-187-167.eu/01.zip

Last edited by peda; 11-14-2018 at 11:40 AM.
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Old 11-20-2018, 08:08 AM   #3
mlukaszek
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Hi,

We are trying to reproduce the problem you're seeing, but so far without luck. An equivalent setup to yours has showed no sign of the problem in a soak test that was running over the weekend.

We do see our service being restarted in logs you sent, but it's unclear what caused it. Normally this could be caused by a device dropping off the USB bus, and reappearing again.

There are a few things you could do to help diagnosing it further.
  • It looks like evdi logs are surpressed on your system. Can you reenable them by using
    Code:
    echo 5 > /sys/devices/evdi/loglevel
  • are there any updates on any of the screens when you see the issue, or are the screens idle when it happens?
  • it would be useful if you send us your xorg.conf - logs from X reveal quite a list of GPU drivers being loaded
  • can you try replugging the docking station to another USB port, without any downstream devices (just the dock and monitors), and see if it improves the situation?

Thanks,
Michal

Last edited by mlukaszek; 11-20-2018 at 08:16 AM.
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Old 11-20-2018, 08:15 AM   #4
peda
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Thanks for looking into it

1) I'll definitely change the EVDI logging settings and upload another log file.
2) It also happens (sometimes) when the screen is in idle, but it does happen far more frequently when there are updates to the screen (i.e. switching through tabs in my IDE, looking at a photo gallery on a website, starting a youtube video, ...) and it does get far worse when I do attach a second monitor to the DisplayLink
3) Yes, will also send my xorg.conf with the next log
4) I'll try to to run the doch only with the monitors - on the laptop side I've already tried both USB 3.0 ports (without success) - I could only try the USB 2.0 port on the other side but I doubt this would be very successful?
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Old 11-20-2018, 11:13 AM   #5
peda
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I did disconnect everything except the screen (and the network, because I don't have a USB/Network adapter at hand right now) from the DisplayLink device. The problem did occur again after less than 30 minutes (this time with 2 DisplayLink screens attached)

The process I followed was the following:
1) startup the computer ~11:30
2) run DLSupportTool --debug
3) change EVDI support tool
4) run DLSupportTool --debug ~11:38
5) screens did turn blank at ~12:02
6) did run DLSupportTool at ~12:03 (with the screens still blank - did not connect or disconnect any USB cables)

As the upload in the forum isn't working (maybe related to the size of the file) I've uploaded it to one of my servers: http://ns342841.ip-37-187-167.eu/02.zip
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Old 11-20-2018, 11:32 AM   #6
peda
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I did now try it again, with the network cable disconnected and being connected to WiFi but the issue is still the same. For me it looks like something is wrong with the DisplayLink driver because

a) The light on my Dell D6000 does stay white/blue even when the screens are black



whereas it does turn red when the USB-cable is disconnected:



b) when there are other devices connected to my Dell D6000 they continue to work, even when the screens turn black

c) lsusb -t output doesn't change (when I compare the working state, with the state when the screens are black)
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