id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,device_name 275,strange 50hz hum fading in after some time - saffire le,furenku,,After an upgrade to Ubuntu 10.04_ I finally got my Saffire LE working; however_ after a couple minutes of working fine_ a strange hum (50 hz) that sounds like PM fades in_ until it becomes quite loud. \r\n\r\nStopping Jack makes it stop_ but when restarting it_ its there. The humming stays when jack restarts even if i disconnect the interface from the computer or even disconnect it from power and reconnect it to power and FW.\r\n\r\nafter the first appearance of the hum_ it may even come when the soundcard is disconnected from firewire... however after rebooting_ and before starting jack_ there's absolutely no hum.\r\n\r\nAny ideas_ where this could come from? \r\n\r\nI already tried jack with another sound card (edirol fa-101) and that worked without problems_ and without any xruns.\r\n\r\nmaybe_ since the hum is 50 hz_ it has something to do with the power supply for the saffire? i'm not using the factory one_ but the one i have definitely fits the specs.\r\n\r\nI'm using Ubuntu 10.04 with a -rt kernel. \r\n\r\nThanks in advance.,bug,closed,critical,,generic,FFADO 2.0.0,duplicate,hum_ saffire_ noise,,