NVidia 346, GTX970, Ubuntu 14.04, black screen, but CUDA-6-5 works

Tried both run and repo installs of 346. CUDA is the special GTX9x0 version.

Found, by switching to lightdm, that the problem was a broken gdm. The login display was always black but no errors were reported in the Xorg logs. Gdm became broken at or near the time I installed the 346 driver, but the problem persisted with my Radeon card.

nvidia-bug-report.log.gz (137 KB)