fatal error: Unable to see card cannot find Radeon device

usage: avivotool [options] [command] --debug - show a little debug info --skip=1 - use the second radeon card regs <set> - show a listing of some random registers <set> restricts: all, core, mc, crtc1, cur1 regsrange <start> <end> - show registers for a given range (wrong range can result in lockup!) regmatch <pattern> - show registers matching wildcard pattern regset <pattern> <value> - set registers matching wildcard pattern romtables <path> - dumps the BIOS tables from either a given path or 'mmap' to get it from memory output <output> <enable|disable> - turns the specified output on or off i2c-monitor - do something i2c-monitor <gpio_in> <gpio_out> - do something