RTX 5070 Ti with RTX 3050

[Vladimir Dergachev]

Hard to tell from the log snippet - is the error from the 3050 card or 
5xxx card ?

If the latter, you can instruct xorg to only pay attention to one card - I 
think the device section in the xorg.conf would do it.

You don't need xorg to run CUDA on the card.

best

Vladimir Dergachev

On Sat, 17 May 2025, Stephan Lloyd wrote:

> I have a weird situation,  I have laboratory PCs setup with gigabyte B760-DS3H-AX or z790 UD AX, with i9 14900KF, and 128 or 256 kingston RAM.  On each I have either RTX 5070 Ti or RTX 5090 in pcie
> 4 or 5 slot, and a GTX 3050 in the PCIe 16x slot for graphics.  The PCs are for running molecular, AI, or genetics based software, the 5070 or 5090, and the 3050 for graphics (2x LGA 27 " screens). 
> The software will only compile and work with the blackwells using nvidia-570-open or nvidia-575-open.  However I get the following errors with xorg:
> 
> [ 578.225] (II) NVIDIA(G0): [DRI2] VDPAU driver: nvidia
> [ 578.225] (EE)
> [ 578.225] (EE) Backtrace:
> [ 578.225] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x14c) [0x64c2bc60803c]
> [ 578.225] (EE) 1: /lib/x86_64-linux-gnu/libc.so.6 (__sigaction+0x50) [0x7cda06045330]
> [ 578.225] (EE) 2: /usr/lib/xorg/Xorg (InitOutput+0x4aa) [0x64c2bc4ce07a]
> [ 578.225] (EE) 3: /usr/lib/xorg/Xorg (InitFonts+0x1d0) [0x64c2bc48ccf0]
> [ 578.226] (EE) 4: /lib/x86_64-linux-gnu/libc.so.6 (__libc_init_first+0x8a) [0x7cda0602a1ca]
> [ 578.226] (EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0x8b) [0x7cda0602a28b]
> [ 578.226] (EE) 6: /usr/lib/xorg/Xorg (_start+0x25) [0x64c2bc475395]
> [ 578.226] (EE)
> [ 578.226] (EE) Segmentation fault at address 0x10
> [ 578.226] (EE)
> Fatal server error:
> [ 578.226] (EE) Caught signal 11 (Segmentation fault). Server aborting
> [ 578.226] (EE)
> 
> and no graphics.  If I use the nvidia-570 or 575, the xorg works fine through the RTX 3050, but none of the software will run, as the RTX 5070/90 are not detected.  Is there a way to get xorg
> working with the nvidia-575-open drivers?  I can find nothing on the internet regarding this, very few posts with the specific error message regarding memory.  The proprietary drvers no longer
> support the new cards, and they refer people to the nvidia-570 or 575-open now, however I tried the cuda-570 and this gives the same error.  My software is compiled with Cuda-12.9.  In addition,
> almost all new motherboards no longer allow selecting the pci used for graphics, defaulting to the first device detected, at the PCIe 5 slot.  And, using CPUs with built in graphics lowers overall
> software performance, as the CPU is being used for graphics.  The graphics in addition on CPUs does not support higher end graphics for molecular biology.  I wondered if anyone knows how to get xorg
> working with this setup?
> 
>