[Pharo-project] CogVM and fn key

Hi, I've got a keybord input problem on the Linux CogVM on my laptop. If I want to write for example the character +, one of the way how to write it is to press something like fn+/. But CogVM ignores it. It is a long term problem of this VM, in the old Squeak VM it works well. Does anyone have the same experience? -- Pavel