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docs: show how to debug nvidia init failures (#12216) 

This debug setting can help troubleshoot obscure initialization failures.
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Daniel Hiltgen 2025-09-08 11:39:00 -07:00 committed by GitHub
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docs/troubleshooting.md
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@ -92,6 +92,9 @@ If none of those resolve the problem, gather additional information and file an
- Set `CUDA_ERROR_LEVEL=50` and try again to get more diagnostic logs - Set `CUDA_ERROR_LEVEL=50` and try again to get more diagnostic logs
- Check dmesg for any errors `sudo dmesg | grep -i nvrm` and `sudo dmesg | grep -i nvidia` - Check dmesg for any errors `sudo dmesg | grep -i nvrm` and `sudo dmesg | grep -i nvidia`
You may get more details for initialization failures by enabling debug prints in the uvm driver. You should only use this temporarily while troubleshooting
- `sudo rmmod nvidia_uvm` then `sudo modprobe nvidia_uvm uvm_debug_prints=1`
## AMD GPU Discovery ## AMD GPU Discovery