Created attachment 133577 [details]
output of journalctl -b -1 booting into 4.12.5-300

I don't know exactly where to post this bug. Initially I posted on RedHat bugzilla #1481510, but it appears perhaps I should be posting it here. The problem started on upgrading from kernel 4.11.11-300 to 4.12.5-300.

Description of problem:

15-30 seconds of black screen and unresponsive mouse, trackpad, keyboard on bootup and suspend and wake.

Version-Release number of selected component (if applicable):

kernel 4.12.5-300

How reproducible:

Every time booting up or suspending and waking laptop

Steps to Reproduce:
1. Boot up and wait for login screen
2. suspend laptop by closing lid with AC power on
3. wake computer by opening lid 

Actual results:


Expected results:


Additional info:
I was having lots of trouble with suspend and wake issues. See Bug 1470473. Resolved all issues after setting boot parameters and updating Dell XPS BIOS firmware and everything was working well with kernel 4.11.11-300.

Current boot sequence that works with 4.11.11-300 is:
========================================================
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod ext2
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root  46985d35-b7e3-41f9-9bc0-8ae6c11bc84c
else
  search --no-floppy --fs-uuid --set=root 46985d35-b7e3-41f9-9bc0-8ae6c11bc84c
fi
linuxefi /vmlinuz-4.11.11-300.fc26.x86_64 root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap nouveau.runpm=0 rhgb quiet resume=/dev/dm-1
initrdefi /initramfs-4.11.11-300.fc26.x86_64.img
=========================================================

Using the same boot sequence with 4.12.5-300 is problematic with bootup and suspend and wake.


Hardware: XPS 15 9560
Fedora 26: all the latest updates current as of 14 Aug 2017