I'm having trouble getting an output for a dedicated graphics card (Radeon HD 7970). I know that the card is capable in my current setup it works fine with windows 10 ,but I don't really want to use windows 10 because numa/multi-socket configs are kinda gimped on win 10.
My setup is as follows:
10x8Gb ddr3 1600Mhz ecc
Some c602 oem motherboard bios and other sources report it as: Inventec B800_1G P/N: 1395T2491604
Saphire Radeon HD 7970 (Have also tried with a GTX 480)
psu is a evga 750w 80+ gold
adata sp600 64gb for storage
I've tried to get a display for the dedicated card ,but for some reason it only wants to use the integrated display adapter (Some Aspeed graphics device: "1a03:2000" also reported as ast3200 in bios). This graphics device only has a single standard vga output ,and I need more than one monitor. I've attempted to find a setting in bios to change default graphics device or disable on board device ,but it seems that this is not an option on the motherboard(Possibly because of the ipmi's kvm over ip implementation). I've attempted multiple solutions found on google for Ubuntu 14.04, Ubuntu 16.04, and Debian 8.3 with both the GTX 480 and the HD 7970.
I think the closest solution I have found is use manually configured xorg.conf ,but last attempt at this seems to have broken display output altogether(xrandr prints "can't open display"). This last attempt was on debian 8.3. I'm going to give Ubuntu 12.04 a go ,but i'm doubtful that this will change much.