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Old 10-23-2017, 06:18 AM   #1
tomekit
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Default Ubuntu 17.10 with DisplayLink 1.4 - Deadly slow and CPU usage dependent

First, I would like to thank you the DisplayLink for keeping up good work. Each release the DisplayLink on Linux is getting better. The quality of those drivers is still far away from their respective Windows version, but I think overall direction is good. Good luck

The problem I am having is really laggy mouse on the screen connected via DisplayLink USB. The lag is hugely dependent on the CPU usage on the laptop.
If laptop is idle, then the lag is visible, but it's still possible to work.
When CPU gets closer to 100% CPU, the screen gets unusable, it reminds me playing video games having 5-6FPS

I've got fresh Ubuntu 17.10 (default GNOME) with kernel: 4.13.0-16-generic on Asus Zenbook UX330-UA with i5-7200U.

Previously I've had Ubuntu 17.04, with 4.12 kernel (custom) and DisplayLink 1.3.54. There was no mouse lag, however the was a mouse/screen flicker on different screens.
Currently I can't see any flicker at all, which was never a case before !
However the lag is present.

Linux support tool output: https://www.dropbox.com/s/skxpmgf4j7...77849.zip?dl=0

Last edited by tomekit; 10-26-2017 at 07:44 PM.
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Old 10-24-2017, 04:34 AM   #2
treffer
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I can confirm this performance regression (although with fedora f26 and kernel 4.13.5-200)

a perf profiling on the DisplayLinkManager binary shows very heavy usage of the copy_user_enhanced_fast_string call (>30%) which isn't the case for DL 1.3.54, so maybe that's causing the lag...
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Old 10-27-2017, 01:02 PM   #3
jagemue
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Have the lag on my second and third display, too. CPU usage is between 8% and 40%, even if I do nothing, just caused by the DisplayLinkMana command. My system is managed by Ubuntu 17.10 (upgraded from 16.04) with gnome. On the builtin screen, there is no lag, even if the notebook (acer aspire v5-573g) is connected to the DL.

Will there be an update for the driver? Otherwise I will go back and install Ubuntu 16.04 again (was much better).
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Old 11-02-2017, 07:54 AM   #4
Emulator
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Same issue with Ubuntu 16.04, I downloaded and installed the last version and the mouse become laggy depending the CPU load usage.

Before this update the system was a little more usable and stable, I think is a regression.
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Old 11-02-2017, 10:32 AM   #5
Antoine DAVID RCA
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Default The same for 16.04/1.4

I guys, I have exactly the same issue (Ubuntu 16.04 / DisplayLink 1.4 driver).
I switch to the 1.3.54 driver, it's better but it's not enough at all...
I have a XPS 13,3" with Intel Core i7 (7th generation) + 16Go RAM and it's really slow slow... I'm very disappointed about the product/drivers.

DisplayLink Support Tool output : https://wetransfer.com/downloads/48d...2114404/88ccf4

Last edited by Antoine DAVID RCA; 11-02-2017 at 10:44 AM. Reason: add linux tool support output
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Old 11-28-2017, 04:44 PM   #6
Emulator
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Any news on this? That's very frustrating, I can't work properly in a new DELL laptop with this bug.
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Old 11-29-2017, 05:30 PM   #7
GoSaneFr
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Default Same here...

I have the same problem as described since I upgraded from KUbuntu 17.04 / driver 1.3.54 (everything was working perfectly) to KUbuntu 17.10 / driver 1.4

I have 3 screens : the notebook's internal, two external connected with a Plugable USB-C triple display (this one)

Only on third screen mouse is laggy, activity on this screen raises the DisplayLinkManager process (up to 50%). First external monitor does not use DisplayLink but AltMode.
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Old 11-30-2017, 12:56 PM   #8
tarkingt0n
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Quote:
Originally Posted by Antoine DAVID RCA View Post
I guys, I have exactly the same issue (Ubuntu 16.04 / DisplayLink 1.4 driver).
I switch to the 1.3.54 driver, it's better but it's not enough at all...
I have a XPS 13,3" with Intel Core i7 (7th generation) + 16Go RAM and it's really slow slow... I'm very disappointed about the product/drivers.

DisplayLink Support Tool output : https://wetransfer.com/downloads/48d...2114404/88ccf4
I believe I'm in the same boat. Dell XPS 13 9360.
Running Linux Mint 18.2 (based on Xenial)
Kernel 4.10.0-40-generic
Running two monitors off the HDMI ports on the Displaylink in addition to the lid monitor

I uninstalled the 1.3.54 driver, rebooted, installed the 1.4 driver, rebooted and I get the laggy mouse and high CPU when working on the external monitors.

I uninstalled 1.4, rebooted, installed 1.3.54, rebooted and that issue no longer occurred... however the process /opt/displaylink/DisplayLinkManager still consumes high CPU as it always has.
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Old 12-01-2017, 07:19 AM   #9
galeon
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Hi guys,

I fought with some similiar problems. Laggy screen, high CPU usage and I just tried this from another thread:

Code:
echo 1 > /sys/devices/evdi/add
My system instantly became more responsiveat a level I totally forgot it existed (except when the CPU is under high usage, but that is still better than it being always in stat state)
To be frank: That is far from what I actually would expect and I'm still mad as hell about it and would not buy any system where I would have to use a DisplayLink device again.

Ubuntu 17.10
Dell XPS 13
External Monitor connected via D3100

I still have to figure out what this actually does and make it permanent.

Hope it may help someone.

Cheers,
Finn

Last edited by galeon; 12-01-2017 at 07:49 AM.
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Old 12-02-2017, 08:55 AM   #10
GoSaneFr
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Quote:
Originally Posted by galeon View Post

Code:
echo 1 > /sys/devices/evdi/add
Thanks a lot, this is much better ! Not perfect and haven't been able to make it permanent. sysfsutils package for Debian/Ubuntu should have worked :
  • apt-get install sysfsutils
  • echo "devices/evdi/add = 1" >> /etc/sysfs.conf

But I don't think it did. However, my third screen is now usable so thanks again.
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