search

xCuri0 / ReBarUEFI

Resizable BAR for (almost) any UEFI system
MIT License
1.35k stars 61 forks source link

Enabling Above 4G Decoding makes the POST and boot process very very slow. #218

Open Raziel49 opened 6 days ago

Raziel49 commented 6 days ago

Hi there,

I was playing around with my laptop that has i7-8750h and RTX 2070 to see if i could enable the hidden Above 4G Decoding option, hoping that i could enable it for then modifying the bios with ReBAR module.

I can find the variable and activate it, and it kinda works, but upon avctivating the option, the laptop takes ages to post, and when the uefi logo finally appears, it takes another age to begin the process of booting windows. Like 15 minutes in total.

The Above 4G decoding option itself it's working fine - large memory is present in device manager ending with FFFFFFFFF and no errors are shown.

Upon restarting the laptop, it boots up at normal speed. The problem happens again if i shut off the laptop completely, so on "cold" boot.

I just can't understand why it takes so long to start the pc. I have csm disabled and all of that.

Any ideas?

Raziel49 commented 6 days ago

i have just observed that sometimes it takes a lot of time to start even if the laptop was only rebooted from already on state.

But happens everytime on "cold" boot.