The problem was the HDMI cable. It appears theres some sort of bug in the latest 5.14.8 kernel that causes some issues with the latest ryzen chips (5700g in my case) and hdmi.
I swapped the hdmi for a displayport cable and now everything works fine =)
I fixed it! It was the HDMI cable. quite strange. I swapped it for a displayPort cable and now everything works fine. No more black screen flashing in mprime and i can set the resolution to 75 hz just fine.
I had tried many different hdmi cables so it wasnt a broken cable. Appareantly...
Already did that
On Nix OS the equivalente is the following
# Upadte microcode.
hardware.cpu.amd.updateMicrocode = true;
According to the documentatio, this does the following:
Update the CPU microcode for AMD processors.
Update. I got my hands on an AMD HD 7970 (very old) and ran mprime again. No screen flashing black now. And I can set the refresh rate to 75 hz no problem.
I'm guessing it's a problem with the BIOS and these new Ryzen chips???
Or maybe there'll be better support with kernel 5.15?
I'm using Nix OS with kernel 5.14.8. and I'm loading the amdgpu drivers. I benchmarked the GPU and it's working fine.
This problem isn't distro specific. I've tried arch and Ubuntu. Same problem.
It's a desktop.
I've been experiencing some CPU instability. (I think)
Every once in a while my screen turns black for a second. I found out I can force this behaviour by running mprime. Firstly, mprime gets stuck at test 1 and shortly after the screen starts flashing black every 30 seconds or so.
This...
Nope. Im using the integrated vega graphics in the 5700g.
the resolution is 2560x1080, nothing fancy.
Besides, it can run at 75 hz. I can change the refresh rate to 74 hz and it runs fine. The problem happens once I try to login again with this refresh rate setting, I get a black screen...
but I was running linux on my prev computer on this same monitor, same hdmi cable 75 hz. the monitor only has hdmi. its an LG 29WL500. on the website it says it support 75Hz and apparently has some sort of RADEON FreeSync technology.
I'm experiencing a weird problem with my new build.
AMD Ryzen 5700G
Fatal1ty B450 Gaming-ITX/ac (BIOS 4.60)
Corsair vengeance CL16 3600 mhz
PNY 500 GB NVME M.2
I've tried installing several distros:
Pop OS
Ubuntu
Nix OS
Manjaro
I even tried with a different motherboard (gigabyte A520I AC)...