User FAQ
- Java GUIs seem sluggish when used remotely (to my desktop or the nyx5/6/7 virtual desktops). How do I speed them up?
- I’m getting a display error. I don’t know how to fix it.
- Numpad is not working after connecting to incline.
- Screen flickering issue when X2go is set to full screen
- System does not register key release after it has been held down for a short period.
Java GUIs seem sluggish when used remotely (to my desktop or the nyx5/6/7 virtual desktops). How do I speed them up?
This is a problem with Java over X11. To speed up the GUI, add the following to your environment before running the application:
export _JAVA_OPTIONS="-Dsun.java2d.pmoffscreen=false"
If you are using a centrally installed Java application where you load a modulefile before use, please contact us via its-ri-team@manchester.ac.uk and we will add the setting to the modulefile. This has already been done for Matlab and Cytoscape modulefiles.
I’m getting a display error. I don’t know how to fix it.
This can occur when using tools such as gedit. Make sure that you have connected to the iCSF with X windows enabled as per the ‘Fundamentals’ section of the GUI-based work documentation.
If you are sure that you have the above aspect correct, but you are getting an error like this:
(gedit:28355): Gtk-WARNING **: cannot open display: localhost:12.0
then the most likely cause is a problem with a small hidden file (.Xauthority) in your iCSF home directory related to X windows. You should delete the file:
rm .Xauthority
(note the dot at the start of the filename is important), log out of the iCSF and back in again. When you log in a new .Xauthority file will be created and you should now be able to use gedit.
Numpad is not working after connecting to incline.
It has been reported that when connecting to incline using the X2go client incline fails to recognise the correct state of the Numlock
Discovered workaround is as follows logout of all incline sessions either via the command line or GUI. Restart the session ensuring Numlock is on prior to connecting to nyx5/6/7. Please note simply closing the X2go windows will not work, previous incline session needs users to log out.
If you still experience problems then please try the following whilst on the the nyx5/6/7 MATE Desktop prior to connecting to incline please select the following option from the top menu bar.
SYSTEM > PREFERENCES > KEYBOARD > LAYOUTS (tab) > OPTIONS > MISCELLANEOUS COMPATIBILITY OPTIONS > 'check' NUMERIC KEYPAD ALWAYS ENTER DIGITS (as in Mac OS)
Screen flickering issue when X2go is set to full screen
It has been reported that after connecting to the virtual desktop service using the X2go client and then selecting full screen X2go will start flickering. The version in use at time was 4.0.5.2. It was resolved by upgrading the X2go client to a later version i.e. ≥ 4.1.1.1
System does not register key release after it has been held down for a short period.
This particular error manifested itself after a user attempted to execute an R script within Rstudio using Ctrl+Enter. Rstudio do not register the key release which in turn made the system unusable. Only option for the user was to kill and restart nyx session.
A workaround is to either adjust or disable the following setting on the Virtual Desktop.
System > Preferences > Hardware > Keyboard > Repeat Keys