Why wslg is running GUIs with a poor resolution on a 4K monitor?

[XushanLu]

Hello,

I have recently started to use wslg and after I installed the newest Nvidia Game Ready driver my computer was able to run Linux GUI apps in 4K on my 4K monitor. However, after the most recent update (Cumulative Update for Windows 11, version 22H2 Insider Preview (10.0.22581.100) (KB5013283)), I observed that wslg could not recognize the 4K monitor anymore. It is only running GUI apps with a reduced resolution (seems to be just 1080P).

Here is the output of 'gxlinfo -B':

❯ glxinfo -B
name of display: :0
display: :0  screen: 0
direct rendering: Yes
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Microsoft Corporation (0xffffffff)
    Device: D3D12 (NVIDIA GeForce GTX 1650) (0xffffffff)
    Version: 22.0.0
    Accelerated: yes
    Video memory: 20238MB
    Unified memory: no
    Preferred profile: core (0x1)
    Max core profile version: 3.3
    Max compat profile version: 3.3
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.1
OpenGL vendor string: Microsoft Corporation
OpenGL renderer string: D3D12 (NVIDIA GeForce GTX 1650)
OpenGL core profile version string: 3.3 (Core Profile) Mesa 22.0.0 - kisak-mesa PPA
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile

OpenGL version string: 3.3 (Compatibility Profile) Mesa 22.0.0 - kisak-mesa PPA
OpenGL shading language version string: 3.30
OpenGL context flags: (none)
OpenGL profile mask: compatibility profile

OpenGL ES profile version string: OpenGL ES 3.1 Mesa 22.0.0 - kisak-mesa PPA
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.10

[1]    658 segmentation fault  glxinfo -B

I don't know why there is a segmentation fault message and whether this is related to the issue. I'd be happy to post any further information if needed. I would really appreciate any suggestions since this issue makes having a 4K monitor almost meaningless as I am intending to use the Emacs app under Ubuntu extensively for writing my code.

I am suspecting that the Nvidia driver is not effective at all since I am noticing an obvious lag in the low-resolution Emacs GUI as I type. Is there a way to check whether the Nvidia driver is really being used apart from the 'glxinfo -B' option?

Thanks very much.