High CPU usage, Mouse non smooth

[giuliocoluccia]

I see that there's a new driver coming out, but for the moment it gives me a blank page telling me that the access is denied (see attachment). I'll try again and test it when available.

[giuliocoluccia]

Nothing seems to be changed with this new release. Still having high CPU usage from DisplayLinkManager (see attachment) processes and mouse movement still non smooth.

[jack_kelly]

I also see high CPU usage from DisplayLinkManager

(I'm on Ubuntu 15.10 using the latest DisplayLink driver and a USB3 to DisplayPort adapter)

[giuliocoluccia]

Same here, but nobody from DisplayLink seems to reply..

[mlukaszek]

Standard Ubuntu's graphical environment, Unity, causes the screen to be always reported as modified full screen, regardless of which screen changes.

That means: even if nothing changes on the screen which is connected to a docking station, we are still told by the OS to resend full screen update if anything is happening on other screen (e.g. built-in laptop screen).

This gets better in other environments - Gnome3 or KDE for example. I would be interested to see if you experience the same CPU usage if you try other env.

Thanks,
Michal

[jack_kelly]

ah, interesting, thanks for the quick reply

[giuliocoluccia]

Originally Posted by mlukaszek

Standard Ubuntu's graphical environment, Unity, causes the screen to be always reported as modified full screen, regardless of which screen changes.

That means: even if nothing changes on the screen which is connected to a docking station, we are still told by the OS to resend full screen update if anything is happening on other screen (e.g. built-in laptop screen).

This gets better in other environments - Gnome3 or KDE for example. I would be interested to see if you experience the same CPU usage if you try other env.

Thanks,
Michal

I actually use Unity and I'd prefer not to change the environment. But my standard usage is to close the lid of the laptop, hence it is off. I use *only* the monitor attached to the docking station 99% of the time.

[mlukaszek]

Originally Posted by giuliocoluccia

my standard usage is to close the lid of the laptop, hence it is off. I use *only* the monitor attached to the docking station 99% of the time.

Which I think sometimes can make things even worse. Lid close multi-monitor scenarios in Linux are something that still need more love - but this varies across GPUs and distros. What is your setup?

Thanks,
Michal

[giuliocoluccia]

Originally Posted by mlukaszek

Standard Ubuntu's graphical environment, Unity, causes the screen to be always reported as modified full screen, regardless of which screen changes.

That means: even if nothing changes on the screen which is connected to a docking station, we are still told by the OS to resend full screen update if anything is happening on other screen (e.g. built-in laptop screen).

This gets better in other environments - Gnome3 or KDE for example. I would be interested to see if you experience the same CPU usage if you try other env.

Thanks,
Michal

Maybe this is a stupid question: if the problem is Unity reporting a full refresh, why doesn't the same issue appear when the same external monitor is connected directly to the mini displayport using a miniDP2DVI adapter?