Intel UHD Graphics (CML GT2) stuck at 40hz on 165hz laptop screen

[ef7]

I have i7-10875H processor on my laptop. I have disabled the NVIDIA dGPU, so the problem is only about intel drivers.

I'm using Debian 11.

Tested with Kernels:
- 5.10.0-9-amd64
- 5.14.0-0.bpo.2-amd64

I have used both Xorg and Wayland, the notebook screen is stuck at 40hz.

But the screen is 165hz.

I think it is something about driver level because it doesn't matter about the Xorg configs or xrandr settings. Even if I set the hertz value 165 on xrandr, the screen still runs at 40hz.

How can I make it run at 165hz like on Windows?

---

Here is my lshw -c video:

*-display                 
           description: VGA compatible controller
           product: CometLake-H GT2 [UHD Graphics]
           vendor: Intel Corporation
           physical id: 2
           bus info: [email protected]:00:02.0
           logical name: /dev/fb0
           version: 05
           width: 64 bits
           clock: 33MHz
           capabilities: pciexpress msi pm vga_controller bus_master cap_list fb
           configuration: depth=32 driver=i915 latency=0 mode=2560x1440 visual=truecolor xres=2560 yres=1440
           resources: iomemory:600-5ff iomemory:400-3ff irq:138 memory:6002000000-6002ffffff memory:4000000000-400fffffff ioport:6000(size=64) memory:c0000-dffff

Here is my lspci -k:

00:02.0 VGA compatible controller: Intel Corporation CometLake-H GT2 [UHD Graphics] (rev 05)
        DeviceName: Onboard - Video
        Subsystem: Tongfang Hongkong Limited UHD Graphics
        Kernel driver in use: i915
        Kernel modules: i915

Here is my glxinfo:

OpenGL vendor string: Intel
    OpenGL renderer string: Mesa Intel(R) UHD Graphics (CML GT2)
    OpenGL core profile version string: 4.6 (Core Profile) Mesa 20.3.5
    OpenGL core profile shading language version string: 4.60
    OpenGL core profile context flags: (none)
    OpenGL core profile profile mask: core profile
    OpenGL core profile extensions:
    OpenGL version string: 4.6 (Compatibility Profile) Mesa 20.3.5
    OpenGL shading language version string: 4.60
    OpenGL context flags: (none)
    OpenGL profile mask: compatibility profile
    OpenGL extensions:
    OpenGL ES profile version string: OpenGL ES 3.2 Mesa 20.3.5
    OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
    OpenGL ES profile extensions:

I have tried creating new EDID file and xrandr Modesetting settings, they didn't work.

 

[arochester]

What is the MAKE and MODEL of your laptop?

 

[ef7]

It is one of the Tongfang laptops, Model: GM5MG7Y2

• Intel® Core™ i7 8-Core Processor 10875H
• GeForce RTX 3070
• 165Hz QHD Panel (2560 x 1440), sRGB 100%
• Magnesium Alloy Chassis
• High Capacity 62Wh Battery
• Thickness: ~20 mm
• 1,7 kg
• 4 Zone RGB Backlit Keyboard
• THX Spatial Audio
• SuperSpeed USB 3.1
• HDMI Output Connection
• 2.5 Gigabit Ethernet
• 1.0MP Webcam
• Wireless Fitted as Standard

 

[arochester]

This suggests you will only get 165hz when you use the NVIDIA dGPU

https://www.reddit.com/r/linuxhardware/comments/ngu4c2

 

[ef7]

I have solved, here is the solution: https://unix.stackexchange.com/questions/680356/i915-driver-stuck-at-40hz-on-165hz-screen?