Recently firmware including BIOS were updated on my laptop (Dell Precision 7530) and since then my Ubuntu does not boot on battery.
The problem happens when I enter Grub2 and are about to select boot option. Then after click on Ubuntu it gets stuck at
Loading initial ramdisk.... It does not matter which kernel I select (5.3, 5.0, 4.15 etc) or whether I go simply after
Advanced Options. A behavior is the same for recovery mode.
It also does not want to hibernate (or sleep) - the mode that is activated if you click and hold for short while power button. I have a dual boot and Windows 10 loads fine on battery, there is only a problem with Ubuntu. There is no problem while laptop is on power. I can switch off plug and work on battery after system boot.
Any ideas on what the problem can be and how to solve it?