Description of problem: After using dnf-system-upgrade, following instructions at https://fedoraproject.org/wiki/DNF_system_upgrade, my laptop stuck at power on and could not be restarted. How reproducible: Always Steps to Reproduce: 1. Hold power button until system powers off. 2. Press power button 3. Actual results: Power light comes on, but screen remains blank, and I turned off(AFAICT). Expected results: System shows hardware boot screen and boots to Fedora 30 Additional info: Hardware is : Lenovo Thinkpad S5 (approx 21 months old) with M2 SSD drive (boot volume) + 1TB hard drive. UEFI Boot (IRRC, can't check as I can't power up). No LVM. * I have upgraded using dnf-system-upgrade previously for F28 & F29 * With a secondary monitor attached to the HDMI port, the secondary monitor goes through a number of wake/sleep cycles, then goes to sleep. Nothing else happens. * I was previously in F29, using the Flicker-Free boot which was shipped as a preview in F29 and it worked properly (although it was not a perfect experience)
After many retries, I have found the system will start sometimes, if I press and hold the SHIFT button before I press the Power button. After the system boot splash is shown, I can release the SHIFT button and the system powers up. So Now I have my system back :) I have left the severity as "urgent" as the workaround seems unreliable (doesn't always seem to work) and the experience of a dead $2000.00 machin is a little agonising.
My Grub config is : GRUB_TIMEOUT=3 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_CMDLINE_LINUX="rhgb quiet loglevel=3 i915.fastboot=1 plymouth.splash-delay=20 resume=/dev/nvme0n1p2" GRUB_DISABLE_RECOVERY="true" GRUB_THEME="/boot/grub2/themes/trevor-kakadu/theme.txt" GRUB_FONT_PATH="/boot/grub2/themes/trevor-kakadu/dejavu.pf2" GRUB_SAVEDEFAULT="false" export GRUB_COLOR_NORMAL="light-gray/black" export GRUB_COLOR_HIGHLIGHT="magenta/black" GRUB_ENABLE_BLSCFG=true
(In reply to trevor from comment #1) > After many retries, I have found the system will start sometimes, if I press > and hold the SHIFT button before I press the Power button. This only works about one time in four.
I was able to fix this problem by resetting the UEFI Firmware (BIOS) on this laptop. I don't understand what in the install process may have made this necessary, but UEFI firmwares seem to be mysterious things sometimes.