radeontool can be used to assist in debugging issues where the screen blanks like this. After installing it, you run it like this:
radeontool regmatch '*' > regdump_good.txt
radeontool regmatch '*' > regdump_broke.txt
Run it two times. Once when you have a good, working screen (for any driver including -vesa), and once in the broken case (either from the tty console or logged into the sick box remotely).
radeontool can be used to assist in debugging issues where the screen blanks like this. After installing it, you run it like this:
radeontool regmatch '*' > regdump_good.txt
radeontool regmatch '*' > regdump_broke.txt
Run it two times. Once when you have a good, working screen (for any driver including -vesa), and once in the broken case (either from the tty console or logged into the sick box remotely).