Kernel messages : i915 0000:00:02.0: [drm] *ERROR* GT0: Failed to initialize GPU, declaring it wedged!

I was trying to get RC6 powersaving working again but the current kernel (Debian GNU/Linux, with Linux 6.12.43+deb12-amd64) didn't show RC6 at all in Powertop.

Can this be related to this error message which I see at bootup (and also during further operation)?

Quote

kernel: i915 0000:00:02.0: [drm] *ERROR* GT0: Failed to initialize GPU, declaring it wedged!

kernel: i915 0000:00:02.0: [drm] *ERROR* GT0: Enabling uc failed (-5)

kernel: i915 0000:00:02.0: [drm] *ERROR* GT0: GuC initialization failed -ENOENT

kernel: i915 0000:00:02.0: [drm] *ERROR* GT0: GuC firmware i915/tgl_guc_70.bin: fetch failed -ENOENT

kernel: i915 0000:00:02.0: Direct firmware load for i915/adlp_dmc_ver2_16.bin failed with error -2

kernel: i915 0000:00:02.0: Direct firmware load for i915/adlp_dmc.bin failed with error -2

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RC6 used to work on a more recent kernel (Proxmox) but it also doesn't work anymore with the current version.

DRM on a NAS isn't very useful but these messages weren't shown at bootup when RC6 was still working.