I do not experience this issue anymore (GS 44rc, 6.2 kernel, 525 Ubuntu main 
driver).
Using powertop does not seem to be reliable but looking at GNOME's energy 
panel, estimated remaining time seems ok. But it varies often with a 0.5 factor 
(without any visible reason).

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https://bugs.launchpad.net/bugs/2009687

Title:
  [lunar] Nvidia GPU unused but still powered

Status in GNOME Shell:
  Unknown
Status in The Ubuntu Power Consumption Project:
  Triaged
Status in gnome-shell package in Ubuntu:
  Triaged

Bug description:
  Hi,

  Lenovo Legion 5 16"
  i7 12700H
  RTX 3070 Ti
  Nvidia 525 proprietary driver (official Ubuntu packages)
  Nvidia on-demand mode
  Ubuntu Wayland or Xorg sessions
  Ubuntu Lunar up to date

  I noticed a high power usage using powertop (or simply remaining time in 
g-c-c...).
  Nvidia driver seems offloaded but gpu power usage still shows ~ 9W -> 23W, 
random.

  
  uname -a
  Linux ****** 6.1.0-16-generic #16-Ubuntu SMP PREEMPT_DYNAMIC Fri Feb 24 
14:37:30 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

  
  nvidia-smi
  Wed Mar  8 10:59:21 2023       
  
+-----------------------------------------------------------------------------+
  | NVIDIA-SMI 525.85.05    Driver Version: 525.85.05    CUDA Version: 12.0     
|
  
|-------------------------------+----------------------+----------------------+
  | GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC 
|
  | Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. 
|
  |                               |                      |               MIG M. 
|
  
|===============================+======================+======================|
  |   0  NVIDIA GeForce ...  Off  | 00000000:01:00.0 Off |                  N/A 
|
  | N/A   34C    P8     9W /  50W |      4MiB /  8192MiB |      0%      Default 
|
  |                               |                      |                  N/A 
|
  
+-------------------------------+----------------------+----------------------+
                                                                                
 
  
+-----------------------------------------------------------------------------+
  | Processes:                                                                  
|
  |  GPU   GI   CI        PID   Type   Process name                  GPU Memory 
|
  |        ID   ID                                                   Usage      
|
  
|=============================================================================|
  |    0   N/A  N/A      5445      G   /usr/bin/gnome-shell                3MiB 
|
  
+-----------------------------------------------------------------------------+

  
  glxinfo -B
  name of display: :1
  display: :1  screen: 0
  direct rendering: Yes
  Extended renderer info (GLX_MESA_query_renderer):
      Vendor: Intel (0x8086)
      Device: Mesa Intel(R) Graphics (ADL GT2) (0x46a6)
      Version: 22.3.6
      Accelerated: yes
      Video memory: 31821MB
      Unified memory: yes
      Preferred profile: core (0x1)
      Max core profile version: 4.6
      Max compat profile version: 4.6
      Max GLES1 profile version: 1.1
      Max GLES[23] profile version: 3.2
  OpenGL vendor string: Intel
  OpenGL renderer string: Mesa Intel(R) Graphics (ADL GT2)
  OpenGL core profile version string: 4.6 (Core Profile) Mesa 22.3.6
  OpenGL core profile shading language version string: 4.60
  OpenGL core profile context flags: (none)
  OpenGL core profile profile mask: core profile

  OpenGL version string: 4.6 (Compatibility Profile) Mesa 22.3.6
  OpenGL shading language version string: 4.60
  OpenGL context flags: (none)
  OpenGL profile mask: compatibility profile

  OpenGL ES profile version string: OpenGL ES 3.2 Mesa 22.3.6
  OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20

  
  lspci
  00:00.0 Host bridge: Intel Corporation 12th Gen Core Processor Host 
Bridge/DRAM Registers (rev 02)
  00:01.0 PCI bridge: Intel Corporation 12th Gen Core Processor PCI Express x16 
Controller #1 (rev 02)
  00:02.0 VGA compatible controller: Intel Corporation Alder Lake-P Integrated 
Graphics Controller (rev 0c)
  00:04.0 Signal processing controller: Intel Corporation Alder Lake Innovation 
Platform Framework Processor Participant (rev 02)
  00:06.0 PCI bridge: Intel Corporation 12th Gen Core Processor PCI Express x4 
Controller #0 (rev 02)
  00:06.2 PCI bridge: Intel Corporation 12th Gen Core Processor PCI Express x4 
Controller #2 (rev 02)
  00:07.0 PCI bridge: Intel Corporation Alder Lake-P Thunderbolt 4 PCI Express 
Root Port #0 (rev 02)
  00:0a.0 Signal processing controller: Intel Corporation Platform Monitoring 
Technology (rev 01)
  00:0d.0 USB controller: Intel Corporation Alder Lake-P Thunderbolt 4 USB 
Controller (rev 02)
  00:0d.2 USB controller: Intel Corporation Alder Lake-P Thunderbolt 4 NHI #0 
(rev 02)
  00:14.0 USB controller: Intel Corporation Alder Lake PCH USB 3.2 xHCI Host 
Controller (rev 01)
  00:14.2 RAM memory: Intel Corporation Alder Lake PCH Shared SRAM (rev 01)
  00:14.3 Network controller: Intel Corporation Alder Lake-P PCH CNVi WiFi (rev 
01)
  00:15.0 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C 
Controller #0 (rev 01)
  00:15.1 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C 
Controller #1 (rev 01)
  00:16.0 Communication controller: Intel Corporation Alder Lake PCH HECI 
Controller (rev 01)
  00:1d.0 PCI bridge: Intel Corporation Device 51b0 (rev 01)
  00:1d.1 PCI bridge: Intel Corporation Alder Lake PCI Express x1 Root Port #10 
(rev 01)
  00:1f.0 ISA bridge: Intel Corporation Alder Lake PCH eSPI Controller (rev 01)
  00:1f.3 Audio device: Intel Corporation Alder Lake PCH-P High Definition 
Audio Controller (rev 01)
  00:1f.4 SMBus: Intel Corporation Alder Lake PCH-P SMBus Host Controller (rev 
01)
  00:1f.5 Serial bus controller: Intel Corporation Alder Lake-P PCH SPI 
Controller (rev 01)
  01:00.0 VGA compatible controller: NVIDIA Corporation GA104M [Geforce RTX 
3070 Ti Laptop GPU] (rev a1)
  01:00.1 Audio device: NVIDIA Corporation GA104 High Definition Audio 
Controller (rev a1)
  05:00.0 Non-Volatile memory controller: SK hynix Gold P31/PC711 NVMe Solid 
State Drive
  06:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD 
Controller PM9A1/PM9A3/980PRO
  34:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. 
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)

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