if this has been mentioned before, please refer me to the right topic. I'm running Qiana 17 (XFCE) on my computer and it ran smoothly and stable ever since it was introduced. Since three days however, I am experiencing graphic glitches that ultimately cause most programs to crash unexpectedly and without warning. It literally makes the system unusable, since I cannot make a backup every 10 seconds. How do I get to the bottom of this? There have been no installs, other than the usual updates. I tried to install and run KDE and va-driver with no results. Also downgrading NVIDIA drivers didn't help. Some data on my system:
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uname -a
Linux karlokick-work 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
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inxi -G
Graphics: Card: NVIDIA GK104 [GeForce GTX 760]
X.Org: 1.15.1 drivers: nvidia (unloaded: fbdev,vesa,nouveau) Resolution: 1920x1080@60.0hz
GLX Renderer: GeForce GTX 760/PCIe/SSE2 GLX Version: 4.5.0 NVIDIA 346.96
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inxi -r
Repos: Active apt sources in file: /etc/apt/sources.list.d/official-package-repositories.list
deb http://packages.linuxmint.com qiana main upstream import #id:linuxmint_main
deb http://extra.linuxmint.com qiana main #id:linuxmint_extra
deb http://archive.ubuntu.com/ubuntu trusty main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu trusty-updates main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu/ trusty partner
Active apt sources in file: /etc/apt/sources.list.d/pipelight-stable-trusty.list
deb http://ppa.launchpad.net/pipelight/stable/ubuntu trusty main
deb-src http://ppa.launchpad.net/pipelight/stable/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/steam.list
deb [arch=amd64,i386] http://repo.steampowered.com/steam/ precise steam
deb-src [arch=amd64,i386] http://repo.steampowered.com/steam/ precise steam
Active apt sources in file: /etc/apt/sources.list.d/ubuntu-sdk-team-ppa-trusty.list
deb http://ppa.launchpad.net/ubuntu-sdk-team/ppa/ubuntu trusty main
deb-src http://ppa.launchpad.net/ubuntu-sdk-team/ppa/ubuntu trusty main