Comment 2 for bug 725580

Hi Sergey "Shnatsel" Davidoff,
radeontool can be used to assist in debugging this issue. To install it from the command line, use this command:

    sudo apt-get install radeontool

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 working screen (for any driver), and once in the broken case (either from the tty console or logged into the sick box remotely). Attach both of those to this bug report, and we can then forward this issue upstream. Thanks ahead of time!