Why is my Compose key not being passed to Synergy?

Question

The key that I assign to the compose key (right Alt) is not passed to the remote computer by Synergy.

I don't know if it's a problem with Synergy or with X, but my guess is that the compose key is 'eaten' by X before Synergy can get it.

How can I check if this is correct? If so, is there a way to both use the key for composing and pass it to Synergy?

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Following the instructions from slm, I get the results below. So the compose key is caught by Synergy, but the id and the onKeyUp mask are different.

When right Alt is defined as a compose key:

new mask: 0x2000
event: KeyPress code=108, state=0x0010
onKeyDown id=61216 mask=0x2000 button=0x006c
send key down to "tapioca" id=61216, mask=0x2000, button=0x006c
new mask: 0x2000
event: KeyRelease code=108, state=0x0010
onKeyUp id=61216 mask=0x2000 button=0x006c
send key up to "tapioca" id=61216, mask=0x2000, button=0x006c

When right Alt is not defined as a compose key:

new mask: 0x2000
event: KeyPress code=108, state=0x0010
onKeyDown id=61418 mask=0x2000 button=0x006c
send key down to "tapioca" id=61418, mask=0x2000, button=0x006c
new mask: 0x2004
event: KeyRelease code=108, state=0x0018
onKeyUp id=61418 mask=0x2004 button=0x006c
send key up to "tapioca" id=61418, mask=0x2004, button=0x006c

Answer 1

From the command line

When debugging issues with synergy I'll typically enable more verbose debugging. On the server side:

$ synergys -d <level> -f -c synergy.conf

Where -d <level> can be a any of the following: FATAL, ERROR, WARNING, NOTE, INFO, DEBUG, DEBUGn (1-5). The -f tells synergys to stay in the foreground so that you can see any messaging directly in the console.

NOTE1: I'd turn the debugging up to say DEBUG2 to start. Synergy should show you every transaction that's being made between the clients and the server.

NOTE2: For the configuration file, you'll need to point it to the location of your current synergys server config.

Through the synergy GUI

If you're using the frontend GUI for synergy things become much easier. You can simply go under the Edit menu and select Settings from which you can then set the log level to whatever you you want.