I got somewhat further.
Kernel tells
xe 0000:00:02.0: Your graphics device 46d1 is not officially supported
by xe driver in this kernel version. To force Xe probe,
use xe.force_probe='46d1' and i915.force_probe='!46d1'
module parameters or CONFIG_DRM_XE_FORCE_PROBE='46d1' and
CONFIG_DRM_I915_FORCE_PROBE='!46d1' configuration options.
Graphics Device is a
00:02.0 VGA compatible controller [0300]: Intel Corporation Alder Lake-N
[UHD Graphics] [8086:46d1] (prog-if 00 [VGA controller])
but applying the mentioned kernel options doesn't make it work either. Forcing
xe to recognize it gives
[ 23.334451] xe 0000:00:02.0: [drm] Found alderlake_p/alderlake_n (device ID
46d1) integrated display version 13.00 stepping D0
[ 23.335224] xe 0000:00:02.0: vgaarb: VGA decodes changed:
olddecodes=io+mem,decodes=none:owns=io+mem
[ 23.340515] xe 0000:00:02.0: [drm] Finished loading DMC firmware
i915/adlp_dmc.bin (v2.20)
[ 23.344679] xe 0000:00:02.0: [drm] GT0: Using GuC firmware from
i915/tgl_guc_70.bin version 70.44.1
but screen remains black.
The problem seems to be that the Intel Alder Lake hardware is simply not
supported by both the old i915 and the new xe display drivers.
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https://bugs.launchpad.net/bugs/2127674
Title:
Screen resolution limited to 800x600 after update to 25.10
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