Thanks. The problem seems to be specific to the radeon driver. Maybe even specific to your ATI ES1000 GPU, which I haven't seen before:
01:03.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] ES1000 (rev 02) Subsystem: Hewlett-Packard Company ES1000 Kernel driver in use: radeon Kernel modules: radeonfb, radeon ** Tags added: radeon ** Summary changed: - gdm gets stuck if not moving mouse + [radeon] gdm gets stuck if not moving mouse -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1778566 Title: [radeon] Screen does not refresh till the mouse moves (ATI ES1000 GPU) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1778566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs