Looks like I've got this one too on Lenovo P50 with E3-1505M. I've created #1759997 since I was not able to trace it immediately to this bug.
The problem is that I had a fully working system until 3.20180312.0 microcode update arrived - which made my system essentially unbootable. This was an unpleasant surprise and may be a wide spread problem since this microcode is now 'main stream'. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1746418 Title: System freezes when starting Xorg after installing linux- image-4.13.0-32-generic Status in linux package in Ubuntu: In Progress Status in linux source package in Artful: In Progress Bug description: My laptop (Lenovo T440) freezes when starting Xorg (lightdm) only after installing the latest ubuntu kernel for 17.10, linux- image-4.13.0-32-generic. Am running Xorg instead of MIR due to MIR crashing when I initially upgraded from 17.04 to 17.10, but that's a different problem for a different day. It's been running with Xorg stably for at least 2-3 months. If I boot with the previous kernel version on my /boot (linux- image-4.13.0-25-generic), everything works fine. If I boot with the latest mainline kernel from the Ubuntu mainline repo (4.15.0), everything works. Using grub's option to run "Recovery Mode" for the 4.13.0-32 kernel, I am able to use the CLI and access the encrypted root filesystem, which is how I generated the apport repo that's attached. It's only when telling it to continue Normal booting that it freezes, which is why I suspect the problem of being Xorg. When the system freezes, the fan starts to spin up. I cannot switch virtual consoles using CTRL-ALT-F{1-7}. CTRL-ALT-DEL pressed repeatedly doesn't do anything. To reboot, I have to hold the power button until the system powers off. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1746418/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
