I finally did it.
1.- Make a folder to store the SSDT files. Then extract it from the ACPI tables (run this part as root):
Code:
# mkdir dsdt
# cd dsdt
# SSDT_FILES=`ls /sys/firmware/acpi/tables/ | grep SSDT`
# for file in $SSDT_FILES ; do cat "/sys/firmware/acpi/tables/$file" > "$file.dat"; done
# cat /sys/firmware/acpi/tables/DSDT > DSDT.dat
2.- Make sure you have IASL installed. On ubuntu, sudo apt install iasl should suffice. I downloaded the source and compiled it myself to get the latest version, but I don't think thats necessary.
3.- There's a duplicate definition in one SSDT file which won't let us dissassemble it. Find out which one it is and delete it:
Code:
# grep PRT0 *.dat
Binary file DSDT.dat matches
Binary file SSDT1.dat matches
# mv SSDT1.dat SSDT1.bak
So in my case it is SSDT1. Replace it with whatever you get. Do not touch DSDT.dat
4.- Next, we find the SSDT file with the code we need to change. We look for the file with both "NVID" and "OSYS" are present: (There's probably a better way to do this in grep)
Code:
# grep NVID *.dat
Binary file SSDT10.dat matches
Binary file SSDT3.dat matches
# grep OSYS SSDT10.dat
# grep OSYS SSDT3.dat
Binary file SSDT3.dat matches
So in my case it was SSDT3, if its different you replace all further instances of SSDT3 with whatever you get.
5.- Disassemble!
Code:
# iasl -e *.dat -d SSDT3.dat
6.- Hopefully you don't see any errors at this point. Replace all instances of OSYS except the declaration with the constant for Windows 7, and bump the definition block number by one:
Code:
# sed -i '/^ *External/! s/OSYS/0x07D9/g' SSDT3.dsl
# sed -i '/^ *DefinitionBlock/ s/0x00001000/0x00001001/g' SSDT3.dsl
If you have a different BIOS, the Definition Block number might not be 1000. Just open SSDT3.dsl in a text editor and look for DefinitionBlock. Whatever number you see on that line, increment it by one.
7.- Compile everything and hope there are no errors.
Code:
# iasl -ve -tc -p SSDT3 SSDT3.dsl
8.- Make an image:
Code:
# mkdir -p kernel/firmware/acpi
# cp SSDT3.aml kernel/firmware/acpi/ssdt3.aml
# find kernel | cpio -H newc --create > acpi_gpufix
8.- All the following instructions corresponding to Ubuntu and GRUB2. Copy it to the boot folder. the initrd.img it's your default img from boot folder:
Code:
# cp acpi_gpufix /boot/
y
ou can permanently add it to your GRUB by editing /etc/grub.d/10_linux. I had to change the line initrd ${rel_dirname}/${initrd} to initrd ${rel_dirname}/acpi_gpufix ${rel_dirname}/${initrd}. Then run update-grub2.
9.- To check if it works:
Code:
$ dmesg | grep ACPI | grep override
[ 0.000000] ACPI: Table Upgrade: override [SSDT-PegSsd- PegSsdt]
[ 0.000000] ACPI: SSDT 0x000000007A715080 Physical table override, new table: 0x0000000079493000
Now you can change the GPU wihtout freezes
source:
https://github.com/Bumblebee-Project...ment-306543064
https://devtalk.nvidia.com/default/t...ng-video-cards
