I am trying to use HDMI with a nVidia GT525M card with the Nouveau driver. Distro is Ubuntu 15.04 and the monitor works perfectly with the VGA output (by a Mini DisplayPort to VGA adapter) - then I know the monitor is not the problem.
Kernel is 3.19.0. Package versions are:
$ dpkg -l | grep nouv ii libdrm-nouveau2:amd64 2.4.60-2 amd64 Userspace interface to nouveau-specific kernel DRM services -- runtime ii libdrm-nouveau2:i386 2.4.60-2 i386 Userspace interface to nouveau-specific kernel DRM services -- runtime ii xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1 amd64 X.Org X server -- Nouveau display driver
However, I am getting lots of graphics glitches, like this one that happens when I move the mouse around:
It happens regardless of the window manager/desktop in use (I tried in Unity, MATE and XFCE). What can be wrong?