After fixing a Manjaro’s Grub issue here on the Forum by adding
amdgpu.dc=0 to Grub, i installed Ubuntu in Dual boot, in order to use Upwork, and since then manjaro boot goes to the black screen again. But manjaro’s grub is still as it was when it was working right before i installed ubuntu along side manjaro. The
amdgpu.dc=0 is still exactly where it was on Manjaro Grub before,
Any idea of why ?