[Bug 108826] Black screen after grub - Ubuntu 18.04 - kernel latest tip 21.11.2018

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108826

--- Comment #2 from Imre Deak <imre.deak at intel.com> ---
Miroslaw, could you post a dmesg log booting with drm.debug=0x1e ?

I see that there's a suspend followed by a second kernel boot with the
nomodeset kernel parameter. Is that some kexec thing? nomodeset will disable
the i915 driver:

Nov 21 20:25:43 qq-ETP101WL64 kernel: [  117.478108] [drm:gen9_set_dc_state
[i915]] Setting DC state from 01 to 00
Nov 21 20:25:43 qq-ETP101WL64 kernel: [  117.743131] PM: suspend entry (deep)
Nov 21 20:26:59 qq-ETP101WL64 kernel: [    0.000000] microcode: microcode
updated early to revision 0x28, date = 2018-05-22
Nov 21 20:26:59 qq-ETP101WL64 kernel: [    0.000000] Linux version
4.20.0-994-generic (kernel at tangerine) (gcc version 8.2.0 (Ubuntu
8.2.0-9ubuntu1)) #201811202101 SMP Wed Nov 21 02:04:29 UTC 2018
Nov 21 20:26:59 qq-ETP101WL64 kernel: [    0.000000] Command line:
BOOT_IMAGE=/boot/vmlinuz-4.20.0-994-generic
root=UUID=c52e7968-edfb-425b-996c-93790fe96a5f ro quiet splash nomodeset
vt.handoff=1

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