This bug has been affecting me since around 2012 or so, when I was using Arch linux (still installed btw). Same graphics chip as OP's. Upgraded ubuntu MATE to 18.04 a week ago, and today the freeze happened again. This time, I intentionally wanted to test if it was fixed, and found out that it still was not. It is random as OP said, but easily reproducible by launching any application involving accelerated 3D. So today I wanted to turn on the 3D spectrum in VLC, and the screen became garbage like on the pic below :
https://i.stack.imgur.com/FEaIj.jpg And since it was VLC, I also heard the looping short bit of my music that was playing when my system froze. So no screenshot possible, the only way out is the reset button. I can confirm this never happened when I used the proprietary driver. This is not a production machine, so I'm willing to test possible fixes if needed. Will post my lspci output tomorrow, +whatever else is needed. Thanks. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1746638 Title: [GeForce 6150SE nForce 430] PC freezes and crashes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1746638/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp