Comment 35 for bug 1768139

Christopher Penalver:

1) I removed the kernel parameters and I am getting the same behavior. I'll leave it off, I had to set it to boot the live cd. There is a bug report somewhere where I found this workaround. It seems to work now, perhaps this acpi problem has been fixed.

2) I'd say probably 9/10 boots. I only saw it boot OK twice where I saw the bios load in mirror mode and then boot fine. Initially it tripped me up thinking that the new kernel version installed had fixed things, but when I repeated the test it failed again. I just did 5 in a row with 4.15.0-22 that all exhibited the issue. I guess i haven't figured out the cause of this occasional working behavior yet.

3) I'm stalled out on kernel builds for the moment. I got back to d4814b5f3812ca78b9a21af3189caeec0181187e in ubuntu-bionic repository (this commit did exhibit the issue), it had to change some of the config options during the build... I guess this happens during the experimental phase? I then tried 2c21160b4023c7f38e5c4fc3cf472efe85a052d5 which made me change a lot more config options during the build and then failed to build. I can try a few more commits perahps it was a temporary build failure. Seems odd that they'd tag a build that didn't compile. Maybe it was rebased and never tested? I'll see if I can contact the kernel guys and ask for some help.

basically I can't start the rebase because I can't find a commit which will build and doesn't exhibit the issue.