Am 17.05.2018 um 13:02 schrieb Mike Gabriel:
Same issue here with pyhoca-cli and Arctica Greeter's remote logon feature.
I'll read the full scope of this mail thread and join in tomorrow...
TL;DR: No local Window Manager equals no working XINERAMA.
TCE-NFS has none, so fails.
TCE-Live comes with one (OpenBox), so works when OpenBox is running.
If you enable the magicpixel-workaround in TCE-Live, OpenBox will be killed once the NX-Window opens (because without a Window Manager, the magicpixel's minimize request is ignored). This is sometimes too soon for XINERAMA, it seems, that's why XINERAMA will occasionally fail on TCE-Live.
The solution is probably to disable MP on the Server and disable the workaround, to keep OpenBox running all the time. $SOON, it will be possible to disable MP on the client side, so no server-side actions will be needed.
Having OpenBox (or any other WM) active brings additional advantages, like window decoration and text field focus for X2GoClient's interactive popups, so I strongly suggest going the "we need a WM" way, rather than trying to "fix" this somewhere else in the code, with possible new side effects.
-Stefan
-- BAUR-ITCS UG (haftungsbeschränkt) Geschäftsführer: Stefan Baur Eichenäckerweg 10, 89081 Ulm | Registergericht Ulm, HRB 724364 Fon/Fax 0731 40 34 66-36/-35 | USt-IdNr.: DE268653243