Hi everyone,
I recently got a new Thunderobot R16 2025 with an RTX 5070 Ti and a 13th-gen Intel i9.
I’ve already unlocked and updated the machine’s microcode, and in the BIOS under the Switchable Graphics menu, I see a setting for MUXed vs MUXless, but only MUXless is selectable.
In the Graphics Mode section, I have the following options:
- iGPU only
- dGPU only
- MS Hybrid
- Dynamic (install NV DDS table if Dynamic is selected)
When I select Dynamic and reboot, the Advanced Optimus section appears in the NVIDIA Control Panel, but it doesn’t seem to work properly, it behaves like standard Optimus (no automatic switching, no display connected directly to the dGPU).
I’m certain the device has a MUX switch (PS8461E) onboard.
Is there anything I can do to force proper Advanced Optimus support or enable the MUXed mode?
Also, I tried using setup_var_cv, but it says it can’t write to EFI. All the BIOS lock settings appear to be unlocked, and from what I’ve seen in the BIOS files, there’s no hidden option related to the MUXed/MUXless setting.
PS: Dynamic (install NV DDS table if Dynamic is selected) became visible only after the bios lock. A Chinese reviewer said that the 4070 variant has advanced optimus
Thanks in advance for any help!
Update: I tried to force the variable through a BIOS hex mod. I saved my settings as User Defaults and found the offset for the MUXed vs MUXless variable. I changed it from 0x2 to 0x1 and flashed the BIOS.
In the BIOS, I restored the User Defaults, but nothing changed — it still shows MUXless (probably because there’s no other selectable option).
In Windows, switching to “NVIDIA GPU only” in the NVIDIA Control Panel behaves exactly the same as before.
Maybe this is a VBIOS-related issue?