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mutter: Force mutter to send modifiers

Closed Olivier Fourdan requested to merge mutter-headless-nvidia into main

Set MUTTER_DEBUG_SEND_KMS_MODIFIERS=1 with mutter based compositors (mutter, gnome-kiosk) to avoid an issue with NVIDIA proprietary driver.

Without this, when running headless, mutter would send only the DRM_FORMAT_MOD_INVALID modifiers, and the NVIDIA driver would reject the buffers created by Xwayland, hence killing Xwayland.

See-also: https://gitlab.gnome.org/GNOME/mutter/-/issues/3060
See-also: https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3320

Edited by Olivier Fourdan

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