Tim Williams composed on 2017-08-06 17:11 (UTC+0100):
I'm having a trouble getting Trinity working on Mageia 6. I've installed via the official URPMI repositories, using the trinity-desktop package to ensure all dependencies are present....
Installed in what context? Upgrade from 5 to 6, or fresh 6? I saw a lot of trouble on Mageia dev and user mailing lists in pre-release testing of upgrades. If upgrade, fresh might turn out to be your expedient solution.
I have 4 TDE on Mageia PCs, but ATM I have no recollection which have upgrades from 5 to 6 or even have TDE instead of KDE5. What I can say for sure ATM is:
1-I don't have gdm, sddm or lightdm installed on any of them. All have either TDM or KDM4.
2-None of my PCs have or ever had an NVidia proprietary Linux driver installed.
Maybe a search for NVidia in the Mageia mailing list archives would turn up a clue?
The mga6 Xorg server version has the modesetting driver incorporated, moved from being a separate driver package as of 1.17.x. Eradicating NVidia and x11-driver-video-nouveau (and remembering to get nomodeset off the kernel cmdline) to let it be used might be worth trying.