This bug can be workaround using the Linux booting argument "radeon.dpm=0"
begin:vcard fn:Savochenko Roman n:Savochenko;Roman org:OpenSCADA Team adr:;;;Kamjanske;;51940;Ukraine email;internet:rom_as@oscada.org title:OpenSCADA author and main developer tel;cell:+380679859815 url:http://oscada.org version:2.1 end:vcard