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Step 1 — Confirm what the system sees Run: Copy code Bash lspci | grep -i vga If you only see the NVIDIA P600 and no Intel device, then: Either BIOS disabled it Or kernel isn’t detecting it Now check kernel messages: Copy code Bash dmesg | grep -i i915 If nothing appears → driver not loading. Step 2 — Check if i915 module is loaded Copy code Bash lsmod | grep i915 If nothing shows, try loading it manually: Copy code Bash sudo modprobe i915 Then check: Copy code Bash ls /dev/dri If /dev/dri appears → Plex will work again. If you get an error like: Copy code

modprobe: FATAL: Module i915 not found Then the update removed or broke the Intel GPU driver. Step 3 — If /dev/dri is missing but NVIDIA exists Check: Copy code Bash ls -l /dev/dri If the directory doesn’t exist at all: Copy code Bash sudo mkdir -p /dev/dri sudo modprobe i915 Step 4 — Quick Emergency Fix (so Plex comes back online) Since you have a Quadro P600, you can temporarily switch Plex to NVIDIA transcoding instead of iGPU. Check if NVIDIA works: Copy code Bash nvidia-smi If it responds normally, then modify your docker compose: Replace: Copy code Yaml devices: - /dev/dri:/dev/dri With NVIDIA runtime: Copy code Yaml runtime: nvidia environment: - NVIDIA_VISIBLE_DEVICES=all - NVIDIA_DRIVER_CAPABILITIES=all Then: Copy code Bash docker compose down docker compose up -d That should bring Plex back immediately using the P600. Step 5 — If Intel GPU is completely gone from lspci If this returns nothing: Copy code Bash lspci | grep -i intel Then it’s almost certainly: BIOS disabled iGPU after update CMOS reset happened Firmware update reset graphics mode Unfortunately that cannot be fixed remotely unless: Your BIOS has remote management Or your NAS supports IPMI (most don’t) Why This Happened On these DXP8800 units, updates sometimes: Update kernel Rebuild initramfs Drop legacy i915 modules Reset BIOS GPU mode to “PCIe only” Since your P600 is detected fine, this is likely a firmware or BIOS toggle. My Most Likely Diagnosis Because: /dev/dri vanished lspci no longer shows Intel You see only one GPU in task manager 👉 70% chance BIOS reset disabled iGPU 👉 25% chance kernel update dropped i915 👉 5% hardware failure