Sporadic boot loop when on battery

[BG_87]

Dear HP Support Community,

I'm writing this post because I have a sporadic issue and I can't figure why this is occuring. As the title suggests, sometimes I have a sort of boot loop when I'm working on battery that can be solved only fully charging the battery or leaving the pc turned off for about 5 minutes.

On my machine I have a dual boot: Windows 10 64-bit and Manjaro Linux. The boot is managed by GRUB, and I use an encrypted boot with LUKS (before getting into the OS selection menu I have to provide a password). My typical boot procedure goes like this:

1. Turn on the PC;
2. Provide the boot password;
3. Wait about 10 s to decrypt the boot partition;
4. Navigate into the GRUB menu to select the OS;
5. Press enter on the selected OS;
6. HP splash screen (the typical splash screen: "hp" written in white over a black background");
7. Password or fingerprint to login into the OS.

Sometimes I got stuck between step 5 and 6. I select the OS, but the HP splash screen does not appear. The problem persists even if I try to restart the machine. The only working solution is just to wait few minutes with the machine turned off, or connecting it to the power source to fully charge the battery.

The issue usually appears when I reboot to switch from Windows to Linux (or viceversa). The issue never occured from a "cold boot".

The odd part is that I can't even get into the BIOS. If I click on the "canc" button on startup (or similar button, I don't remember now which button I press) I get the typical list for doing the HP diagnostic and to change bios options. If I try to access the BIOS I get a black screen with a blinking "_" on the top left corner of the screen.

I have recently updated the BIOS (version F.20 SoftPaq number: sp131763), but the issue persists. I tried several diagnostic tests, but none of them highlighted any issue.

Is it a known issue? If so, which is the solution (if any)?

Two points that are probably not linked to the problem, but that I want to specify:

• My battery has a remaining capacity of 84% after less than 1 year of use (Cycle count: 82 / 1000). This is a pretty low figure for a battery, but considering that sometimes I run highly intensive CPU tasks (100% load for hours) the excessive wornout may be linked to the "high" CPU temperatures.
• Manjaro and Windows show a different time in the clock due to the different ways they interpret the time provided by the motherboard.

Thank you for reading this long post and for any future help on this issue!