Created attachment 144579 [details]
Failing kernel log

I've got a fairly recent Dell/Alienware GTX 1080. It fails on
initializing/resetting the Falcon during boot, and is not usable by Xorg
subsequently. See *-bad.log attachments.

Workaround: boot into Windows, and reboot into Linux. Everything works fine
after that. See *-good.log attachments.

Initialization timeout happens in acr_ls_sec2_post_run(), in
ls_ucode_msgqueue.c. The corresponding Xorg driver error message is "Failed to
initialise context object: 2D_NVC0 (0)"