Classification: Kernel Architecture & Display Subsystem Recovery Status: Implemented & Verified

Executive Summary#

This report covers root-cause diagnosis, driver stack reinstallation, and display provider synchronization on a hybrid graphics architecture (Intel Core i9-13900HX / NVIDIA RTX 4090 Mobile) running under non-systemd (Artix) Linux with XFCE Desktop Environment. It details the recovery protocol following a desktop environment collapse (corrupted font/theme subsystems and session manager crashes) and the resolution of xrandr discrete output provider drops.

Failure Modes & Diagnostic Log#

1. Display Server & Session Collapse#

  • Symptoms: The XFCE desktop environment rendered text as bordered fallback blocks, displayed empty menus, and crashed upon user interaction.
  • Log Telemetry:
    • Failed to execute child process /usr/bin/pm. (No such file or directory)
    • Gdk-WARNING: Native Windows wider or taller than 32767 pixels are not supported.
    • ICE I/O Error / Disconnected from session manager. (Total session crash)
  • Root Cause: Corrupted font rendering libraries, missing GTK theme assets, and mismatched NVIDIA kernel module hooks following an underlying update.

2. Hybrid PRIME Provider Detection Failure#

  • Symptoms: External high-resolution monitors (Acer XZ322QU V3) connected through discrete GPU paths remained unpowered and unresponsive.
  • Log Telemetry: xrandr --listproviders reported only a single active provider, failing to synchronize the discrete bridge despite nvidia-drm.modeset=1 kernel parameters being active.

Remediation Protocol#

1. Desktop & Theme Library Reinstallation#

Reinstalled core XFCE session components, GTK themes, and font rendering libraries to resolve corrupted interface assets:

sudo pacman -Syu xfce4-session xfce4-goodies xfce4-panel xfce4-settings
sudo pacman -Syu gtk2 gtk3 adwaita-icon-theme greybird-themes fontconfig freetype

2. Configuration Reset#

Isolated corrupted user session configuration directories to force clean desktop initialization:

mv ~/.config/xfce4 ~/.config/xfce4.BAK

3. Driver Stack Rebuild & Ramdisk Regeneration#

Verified hardware bridges (lspci -k | grep -A 3 VGA), reinstalled the proprietary NVIDIA driver stack (575.64.03), and regenerated initial ramdisk kernel images:

sudo pacman -Syu nvidia-dkms nvidia-utils lib32-nvidia-utils
sudo mkinitcpio -P

4. Display Provider Synchronization#

Synchronized the Xorg output provider mapping to bridge discrete NVIDIA rendering paths to physical display outputs, restoring external display detection.

Operational Verification#

  • Session Stability: Restored full Xorg sessions with complete GTK font rendering and active session persistence.
  • Multi-Monitor Pipeline: Verified dual-provider visibility under xrandr, enabling hardware-accelerated rendering across external displays via the discrete pipeline.

Key Takeaway#

Hardware recovery requires bottom-up diagnosis. Resolving display subsystem failures requires verifying kernel parameters, regenerating driver ramdisk hooks, and validating display server provider maps before troubleshooting desktop configuration files.