Graphics error after boot menu, boot unsuccessful.

[Cactus2580]

Outstanding work.  Need a bit to process. 

On the off-chance you are around at this minute, what happens if you just append
vga=ask
Do you even get any text at all or does it stay rainbow snow?

Sorry, didn't get to this earlier. If I append VGA=ask it does the same thing as if I use the F7-ask boot flag presented by the bootloader. Green text asking me my resolution. Picking the correct resolution ends in undefined video mode, picking any other resolution ends up with more rainbow but less snow, some of them are just endless scrolling lines. Either way, I've tried every option it gives and no luck so far. Did see a bit on forcing the Radeon driver using kernel commands from a Google search last night, so will try that a bit later and report back. 

Thanks again for your help!

[grindstone]

Appreciate the report. Thank you for the patience and for all the work. Was wondering if you tried xorg=radeon on the RC7, too. Got interrupted today as well so gotta hit it another later but more to come.

[Cactus2580]

Appreciate the report.  Thank you for the patience and for all the work.  Was wondering if you tried xorg=radeon on the RC7, too.  Got interrupted today as well so gotta hit it another later but more to come.

No worries! As for xorg=Radeon, yes, have tried that to no effect, but that was before moving firmware from AntiX to DSL so I will give it a shot on the reroll as well and see if it is any different.