As a workaround, try selecting 'Ubuntu on Wayland' on the login screen just before you enter your password.
** Summary changed: - Xorg freeze on Intel Core 2 T5800 + Xorg sessions fail to start on Intel Core 2 T5800: modeset(0): drmSetMaster failed: Permission denied ** Also affects: gdm3 (Ubuntu) Importance: Undecided Status: New ** Changed in: mutter (Ubuntu) Status: Incomplete => New ** Changed in: xorg-server (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1901342 Title: Xorg sessions fail to start on Intel Core 2 T5800: modeset(0): drmSetMaster failed: Permission denied To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1901342/+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