jkn <
jkn_gg@nicorp.f9.co.uk> wrote:
Hi all
a quick question to hopefully get some pointers...
I run Linux on an MSI B550-A Pro motherboard, with a Ryzen CPU. I have been running with a cheapish graphics card until recently - GT720 I think.
I have just upgraded this to an MSI GT1030 card - only because I need to
use a KVM and my setup means that this has to use Display Port rather
than HDMI, which I was using previously.
So, simple test - fit new graphics card, try previous HDMA cable, all fine. Swap to a known good HDMI cable - no output. The Monitor
(Dell U2412M) sees nothing whether the input is set to DisplayPort or 'Auto'.
I also tried plugging the video card DP output into my KVM; the LED
shows red which I presume means 'no input'.
I'm just trying to work out which world of pain I am now entering.
Assuming the eBayer I got the card from is telling the truth when they
say it was working for them via DP, is this likely to be a Linux
driver issue, a Bios issue, or perhaps something else? I guess
I am a bit surprised I don't even see the Bios, but DP is new to me and perhaps there is something I am missing...
That's odd, one HDMI cable works the other doesn't?
Or do you mean 'Swap to a known good DP cable'?
It's not unusual for GPUs to only display the BIOS on one output, or for the monitor to not sync to it (BIOSes often use a strange mode like 720x400). Sometimes monitors are just grumpy.
One thing you could try is wiring up the monitor with both HDMI and DP
cables. Then, using the one that works, go into settings and see if it can detect the other monitor. Try switching between inputs on the monitor until you can get both to work.
(Also, stupid thing because it's bitten me before: Ryzen mobos may have an
HDMI or DP socket on the mobo, but if there's no graphics in the CPU the
socket doesn't do anything. If you were fumbling about the back maybe you plugged into the useless socket?)
Try to get things working before setting up the KVM, because KVMs add
another layer of trouble into the mix. If you keep the HDMI running while fiddling with the DP settings, you can at least see to fiddle with them.
Another thing, you are using the proprietary NVIDIA Linux drivers? The
system may come up with nouveau (reverse engineered open source driver) by default, which isn't very reliable especially on more modern GPUs.
Theo
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