External Display not being recognized (Intel Graphics)

[physicsuofraui]

I have just installed Debian 12 on a Dell Latitude 5550 and everything was working fine, but the HDMI output will not work. The monitor I was trying to use previously worked with PopOS.

After some reading online I ran

Code: Select all

inxi -G

and got the following as output

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Graphics:
  Device-1: Intel Meteor Lake-P [Intel Graphics] driver: N/A
  Device-2: Realtek Integrated_Webcam_FHD type: USB driver: uvcvideo
  Display: x11 server: X.Org v: 1.21.1.7 with: Xwayland v: 22.1.9 driver: X:
    loaded: vesa unloaded: fbdev,modesetting dri: swrast gpu: N/A
    resolution: 1920x1080~77Hz
  API: OpenGL v: 4.5 Mesa 22.3.6 renderer: llvmpipe (LLVM 15.0.6 256 bits)

I am particularly curious about why Device One would have N/A as a driver. I figure that is probably my problem but am not sure how to fix it.

[mrmazda]

inxi -G doesn't quite say enough. Try inxi -GSaz. Odds are the problem is your Meteor Lake GPU is too new for support by the stock Debian 12 kernel, while the PopOS kernel does support it. If you upgrade to a backport kernel it may be all that's required to make this problem go away. Without KMS support from a kernel GPU driver, only one display at a time is supported.

[arzgi]

I had a little free time yesteday, and searched your problem. I found Intel has made kernel patches, so you should get it working with stock Debian kernel 6.1.

Had not so much time, that could solve where these patches are