Windows 8, Lenvo USB 3.0 dock = lag + fuzzy image

[skomialek]

I'm experiencing exactly same issue (big lag in mouse movements). I've installed latest driver but still no help.

Setup:
- Lenovo X1 Carbon
- ThinkPad USB 3.0 dock
- 2 screens running 1920x1200
- Gigabit Ethernet cable connected
- Wireless mouse and keyboard receiver connected to the dock
- DisplayLinkManager v. 7.3.49122.0


Some observations (I didn't bother read through all of the posts in the thread so sorry if there are some duplicates):
- DisplayLinkManager eats up ~20% CPU (seems mostly kernel time)
- Updated driver doesn't seem to help at all
- lag is gone if I connect mouse / keyboard receiver directly to the laptop (not through the dock)
- with no receiver DisplayLinkManager CPU usage is down to 3~5%


For now I'm happy with the workaround (connect mouse and keyboard receiver directly to the laptop), but it'd be really nice if this issue got solved.

[Wim]

Originally Posted by skomialek

I'm experiencing exactly same issue (big lag in mouse movements). I've installed latest driver but still no help.

Setup:
- Lenovo X1 Carbon
- ThinkPad USB 3.0 dock
- 2 screens running 1920x1200
- Gigabit Ethernet cable connected
- Wireless mouse and keyboard receiver connected to the dock
- DisplayLinkManager v. 7.3.49122.0


Some observations (I didn't bother read through all of the posts in the thread so sorry if there are some duplicates):
- DisplayLinkManager eats up ~20% CPU (seems mostly kernel time)
- Updated driver doesn't seem to help at all
- lag is gone if I connect mouse / keyboard receiver directly to the laptop (not through the dock)

<SNIP>

Then the problem is nothing to do with DisplayLink, but USB interference as covered here:

http://kb.displaylink.com/340

Wim

[skomialek]

Hi Wim,

Thanks for the reply. You're right. I misinterpreted the problem since it started as I had mouse connected to the USB 2.0 hub connected through the ThikPad dock (which was I believe caused by the fw). I then connected to directly to USB 3.0, problem persisted (or even got worse) so I updated the firmware. Now it is connected back to the USB 2.0 hub and the problem doesn't occur.

Thanks for help.

Regards,
Lukasz

[akohit]

I've read through a good portion of this thread and wanted to add my experience.

Setup a Yoga 13 for a user yesterday, their config is:
Yoga 13
Lenovo USB 3.0 Dock
Display Link 7.3 drivers
Two 27" Samsung monitors at 1920x1080

Only things plugged into Dock were keyboard/Microsoft Arc mouse (wireless)

Mouse lag was bad, it made the setup unusable. I found the article about Intel's study on 2.4ghz devices and USB 3.0 so I switched out the wireless mouse to a wired one. User said the lag is much better and hasn't reported it as being an issue still (yet).

So, if you are having lag issues and using a wireless mouse then start by swapping it for a hardwired one (as Wim has suggested).

[elfuego]

I also have the issue described in the first post. Brand new Lenovo x1 carbon running on windows 8, USB 3.0 hub, 2 displays connected with wired keyboard and mouse.

I experienced a very unpredictable mouse lag, very sluggish performance while moving around active windows. Then I followed the instructions here:
http://www.displaylink.com/support/ticket.php?id=346

and the effects have gotten from bad to worse - the external monitors now do a mini-blink whenever I type anything on a keyboard and occasionally there are graphical glitches (similar to ones when you overclock a graphics card too much). Of course, in addition to very slow performance.

Is there any help to this issue finally?

Edit: Fixed - the problem was that the hub was connected to the USB 2.0 port instead of USB 3.0. The X1 carbon has 1xUSB 2.0 and 1xUSB 3.0 connector. Not both are USB 3.0 :-/