/dev/pmu & questions

[felix]

Just a couple of quick questions/error messages.

When I log into my Ubuntu system, I get an error message that reads 
'permissions on the file /dev/pmu are broken' ... what is it and how can I 
fix the permissions? 

During the bootup, I get an error message that reads 'radeonfb: invalid ROM 
signature 0 should be 0x0c500038c' 

Cdrecord doesn't work properly, I get the following error message, 
'cdrecord: No such file or directory. Cannot open '/dev/pg*'. Cannot open 
SCSI driver' 

Anyone have any ideas? 

This is an awesome distro, I think it has alot of potential, I like it 
better than Yellowdog Linux.