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[NV50][Linux 5.15] Can't switch to TTY from GUI

On a HP EliteBook 8540w with an NVIDIA GT216 (0a5e00a2) running Gnome (Wayland) on a Debian (bullseye) it is no longer possible switch to an TTY from GUI via CTRL+ALT+Fn keys. The GUI remains visible but no more interaction is possible.

I trace back the regression to 477f70cd2a67904e04c2c2b9bd0fa2e95222f2f6. Building Linux 5.15 with CONFIG_DRM_NOUVEAU_BACKLIGHT disabled resolves the issue.

5.14 and earlier with CONFIG_DRM_NOUVEAU_BACKLIGHT enabled does not show this behavior.

Please let me know if there is anything else I can do.

Thanks, Tino

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