/etc/trinity/tdm/Xsetup not working on Buster

Hi all, Maybe not really a Trinity issue, but: On my Toshiba z20t, I have setup so that I get an onscreen keyboard at login, for the (rare) occasions where I use the computer as a tablet. This had been talked about some time ago on this list and involves adding onboard & in /etc/trinity/tdm/Xsetup and killall onboard in /etc/trinity/tdm/Xstartup Now, the issue: this works perfectly on Stretch. It does not on Buster. Both installs on the same machine. Onboard itself works, simlpy it does not appear on the login screen on my Buster install. The only difference I can find (except for Debian's version) is that Buster's Trinity was installed from Slavek's repository. Thierry