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
Attached prevboot.txt as instructed. Thanks for your assistance.
** Attachment added: "Output of 'journalctl -b-1 > prevboot.txt'"
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1901342/+attachment/5427638/+files/prevboot.txt
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Also, as a workaround try selecting 'Ubuntu on Wayland' on the login
screen, just before you enter your password.
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
** Tags added: regression-update
**