Created attachment 141538 [details] crash dump as suggested by the error log Experiencing this on a X1 Carbon 2017, kernels 4.15 and 4.18 on ubuntu 18.04. System starts properly only with nomodeset, otherwise the screen freezes right around login. Eventually I manage to switch to another tty and pull the logs. Sep 12 16:06:42 carbon kernel: [drm] GPU HANG: ecode 9:0:0x85df3eff, in gnome-shell [1373], reason: hang on rcs0, action: reset
*** This bug has been marked as a duplicate of bug 109250 ***
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