A collection of information about the notebook Acer Predator Helios 300 2021 (PH315-54-70LH, Brazil Version).

Source

• Unlock undervolting
• Unlock BIOS Downgrade
• Unlock BIOS Downgrade 2
• Heating Issue System/PCH

• Unlock 140W TGP on PH315-54 - RTX 3070 - Portuguese
• VBios Files (to use with nvflash.exe):
  • My VBios - Base ??? / Max 110W TGP - MD5 3491a5598028693a0e39a218a64d4522
  • PH317-55 VBios - Base 112W/Max 140W TGP - MD5 fe551497a9171e1f64c44d5d3bd4ab49
  • Above video VBios - Model ??? - Base 115W/Max 140W TGP - MD5 de2f57f0a19dde8cd64f01735be4be23
  • MSI GE76 RAIDER 10UG - Base 125W/Max 140W TGP - MD5 8d7eb73124f196f827e9ade2de65772d

• Turbo mode and RGB Keyboard
• Fan control
• ACPI Acer EC module
• Generic info about Acer Notebook on linux
• intel-undervolt
• Acer Baterry Health and Calibration

There is no PCH temp reading on linux (System temp on Predator Sense on Windows side). I tested on kernel 6.0, 6.1 and 6.2-rc6, and there is no information about the PCH temp reported by the kernel. Using the acpi_ec and nbfc, I could read this information from the EC reg directly. To get this information you need to compile the nbfc project and use the ec_probe program to read the register 0xB3 in my case. You can run the command sudo ec_probe read 0xB3 to get the measure.

EC List:

• 0xB3 : Intel PCH Temp
• 0xB4 : RTX 3070 Temp
• 0x13 : Read CPU Fan Speed ??? (From nbfc config file)

I'm using the intel-undervolt project to do the undervolt on 11800H CPU (after the unlock procedure on the Windows, see the Windows section). I'm using this configuratio below without any problem:

undervolt 0 'CPU' -84.0
undervolt 1 'GPU' -25.0
undervolt 2 'CPU Cache' -70.0
#undervolt 3 'System Agent' -60.0 // This value does not work on my linux
undervolt 4 'Analog I/O' -65.0

# Min tjoffset -4
tjoffset -8

• Open more ventilation slots on the back cover - Portuguese
• Screen replace - Portuguese

• Acer Support pages:
  • USA
  • Brazil
• Brazil User group on Telegram
• PH315-54 Review