High CPU usage, Mouse non smooth

[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]

Ubuntu 14.04.3 (Unity), Intel HD Graphics 4000 GPU (driver i915)

$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)

No problem at all with same setup/usage, but external monitor attached to mini DisplayPort