If your issue is that you get normal just a black screen, and if downgrading just grub restores your graphics (as per comment #22) this implies that grub is leaving the graphics card in a state that the kernel cannot recover from. To diagnose this we need to get the output of intel_reg_dumper in both cases, ie changing only grub. Please attach both dumps here.
If your issue is that you get normal just a black screen, and if downgrading just grub restores your graphics (as per comment #22) this implies that grub is leaving the graphics card in a state that the kernel cannot recover from. To diagnose this we need to get the output of intel_reg_dumper in both cases, ie changing only grub. Please attach both dumps here.