OpenGL applications have stopped working in ThinLinc recently on Fedora 28:
> [tester@samuel-80 Videos]$ glxgears
> Error: couldn't get an RGB, Double-buffered visual
> [tester@samuel-80 Videos]$ glxinfo
> name of display: :10.0
> Error: couldn't find RGB GLX visual or fbconfig
> [tester@samuel-80 Videos]$ totem tears_of_steel_1080p.webm
> (totem:8748): GLib-CRITICAL **: 12:43:48.133: g_strsplit: assertion 'string != NULL' failed
> Segmenteringsfel (minnesutskrift skapad)
Fedora's own Xvnc seems to work however, it is likely this issue is happening because we are based on such an old Xorg.
Note that this means that desktop environments like GNOME which use OpenGL can't be used at all in ThinLinc.
When I try to start GNOME I get a black screen followed by a number of crash popups by abrt (abrt seems like the only thing working in the session) that says gnome-shell has crashed.
Can't see anything relevant in xinit.log for GNOME sessions that can't be started nor for when glxgears fail in Xfce.
Pretty much a duplicate of bug 6177. Fedora managed to screw up the fallback handling in a recent update which caused the issue:
Fortunately that means it is Fedora specific, and should hopefully be fixed soon.
We should no longer need this fallback now since we have upgraded Xorg in bug 5241. I'll verify this along with bug 6177.
Can verify that OpenGL now works on Fedora 28 with the nightly build of the ThinLinc server.