I’d been having an issue in 15.04 with Nvidia graphics where the cursor vanished when it was pushed right to the top of the screen. Using menus or closing maximised windows was tough. I eventually found a solution in this bug listing.
Near the bottom there is an entry by Heath Jones (hjones014) from the 2015-05-18.
“I finally remedied the problem, using the xorg-edgers ppa. This is what I did –
1. sudo apt-add-repository ppa:xorg-edgers/ppa
2. sudo apt-get update
3. goto additional drivers and select driver 349.16
5. goto software/updates and goto the “Other Software” tab and UNCHECK the xorg-edgers ppa. I DID NOT PURGE THIS PPA.
The reason why I nixed this ppa is because after selecting driver 349, the software updater would try to pull in other updates from the xorg-edgers ppa which kept crashing my system. This allowed me to keep the driver 349 and not pull in any other updates. If you do a ppa-purge, it will also nix the driver, hence why i just unchecked it in the sources tab.”
I followed those instructions and it worked for me. Hopefully it’ll help someone else.