Notebook Asus N56VJ, Ubuntu 16.04, nouveau driver.
I intend to use external monitor with notebook lid closed. But in such a configuration, it appears that the graphics performance is low as compared to when the lid is not closed. The behavior is not affected if the external monitor setup is mirror/extended.
This looks strange that on one working external monitor , the performance is low. This evident, by the mouse cursor movement looks jumpy and not at all smooth. As soon as i open the lid, the performance is back to normal.
The proprietary NVIDIA driver is available for my notebook, but it is just unusable, for multi-monitor setup, it does not even work.
Secondly, another minor issue is that when i disconnect the external monitor, the correct behaviour should be that all the windows/applications running on external monitor should get back to the primary display, but this does not happen on the disconnect trigger event, but if i do Ctrl + Alt + F1 and then agian Ctrl + Alt + F7, the apps come back to primary display as expected. Though i can live without this minor issue, but a fix would be handy.
Any help is appreciated, or if i can give more debug logs etc, please let me know what and how,in the comments.