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General troubleshooting

TODO: Make better formatting

Installation fails, some library dependencies are not satisfiable, what can I do? (Linux)

Make sure your Ubuntu or Raspbian version is supported (check the requirements).
Make sure you added 'universe' to the repositories.
Make sure you have an internet connection when you install the package.
Make sure Ubuntu / Raspbian is up-to-date (for Ubuntu or Raspbian, run "sudo apt-get update && sudo apt-get upgrade" in a terminal).

I'm having lag issues and/or movement glitches, what can I do? I want best performances, what should I check?

If you are using a TV, make sure to enable the gaming mode (not all the TVs have such a mode, read the user manual).
If you have lag even with a genuine sixaxis/dualshock 3, the lag is probably not due to GIMX.
Increase your mouse frequency as explained there: link.
Make sure your mouse frequency is between 250Hz and 500Hz, and at least twice the GIMX update frequency.
Make sure your mouse can track at least 2000 DPI, and make sure your mouse is running at the highest DPI setting.
Don't use the calibration GUI or the terminal output while playing.
Close any other application (Firefox...).
Avoid usb extension cables and hubs. Some of them are weak and result in poor performances.
Some bluetooth dongles are reported to generate lag issues. It is recommended to use a bluetooth dongle with a CSR Bluecore4-ROM chip.

I can't save my config file? I can't see the config file I saved?

Save your config files in the right directory: C:\Users\<username>\AppData\Roaming\gimx\config or /home/<username>/.gimx/config (Linux).
GIMX 1.12 and older: C:\Users\<username>\AppData\Roaming\emuclient\config or /home/<username>/.emuclient/config (Linux).
GIMX 0.51 and older: C:\Program Files\GIMX\config (Windows 32bits) or C:\Program Files (x86)\GIMX\config (Windows 64bits).
In Linux, the folder named ".gimx" is hidden. Press ctrl+h to display hidden folders!
Don't run anything as root user.

I can't edit my config file? Modifications are not saved?

File permissions are probably wrong.
Start a terminal: Click on the Ubuntu Dash, type "terminal" in the search bar, and click on the terminal icon.
Then type:

ls -l ~/.gimx

You'll see something like this:

total 8
drwxr-xr-x 2 root root 4096 2012-02-24 15:27 config
drwxr-xr-x 2 root root 4096 2012-02-24 15:27 macros

In the above example, file ownership is wrong.
To fix it, type:

sudo chown -R owner:usergroup ~/.gimx

Replace owner and usergroup with the appropriate values, which are usually your username for both.
If you are not sure just type:

ls -ld ~

You'll see something like this:

drwxr-xr-x 94 username group 4096 2012-02-24 16:24 /home/username

Do the same for the ~/.gimx-launcher directory.

Is it possible to use a virtual machine?

Yes and no. It's not officially supported and I don't give support for that. Running the software may work, but for compatibility and performance reasons, you should not use GIMX in a virtual machine.

Is there a mac os solution?

No, not yet. There probably will be a solution some day, but I have no idea about the date.