PRIME Render Offload on Razer Blade 15 (2022, Advanced, RTX 3070 Ti)

I have succeeded at getting PRIME Render Offload to work on my Razer Blade 15 2022, Advanced RTX 3070 Ti.

  • dGPU power management working
  • Ubuntu 20.22 on kernel 5.18.0
  • NVIDIA driver version 470
  • s2idle works
  • Connecting an external monitor works but enables the dGPU. I’m not covering reverse-prime here

Setup:

1. No xorg.conf.

2. Edit /etc/udev/rules.d/80-nvidia-pm.rules and put in:

# Enable runtime PM for NVIDIA VGA/3D controller devices on driver bind
ACTION=="bind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x030000", TEST=="power/control", ATTR{power/control}="auto"
ACTION=="bind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x030200", TEST=="power/control", ATTR{power/control}="auto"

# Disable runtime PM for NVIDIA VGA/3D controller devices on driver unbind
ACTION=="unbind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x030000", TEST=="power/control", ATTR{power/control}="on"
ACTION=="unbind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x030200", TEST=="power/control", ATTR{power/control}="on"

3. With PRIME offload running, nvidia settings will look pretty empty.

xrandr –listproviders should look like this:

$ xrandr --listproviders 
Providers: number : 2
Provider 0: id: 0x43 cap: 0x9, Source Output, Sink Offload crtcs: 4 outputs: 1 associated providers: 1 name:modesetting
Provider 1: id: 0x235 cap: 0x2, Sink Output crtcs: 4 outputs: 8 associated providers: 1 name:NVIDIA-G0

When running without prime-run:

$ glxinfo | grep vendor
server glx vendor string: SGI
client glx vendor string: Mesa Project and SGI
OpenGL vendor string: Intel

And with the prime-run variables:

$ __NV_PRIME_RENDER_OFFLOAD=1 __VK_LAYER_NV_optimus=NVIDIA_only __GLX_VENDOR_LIBRARY_NAME=nvidia glxinfo |grep vendor
server glx vendor string: NVIDIA Corporation
client glx vendor string: NVIDIA Corporation
OpenGL vendor string: NVIDIA Corporation

Useful things

  • Determine if dGPU is suspended: 
    • cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_status

$ cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_status
suspended
  • Total time suspended (if this is 0, you are not ever entering suspended state, so the GPU is always on). 
    • cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_suspended_time

$ cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_suspended_time
1547259

Resources

07/10/22