Increasing usbcore.usbfs_memory_mb or decreasing the number/size of the buffers requested in rtlsdr_read_async fixes this for me.
On Mon, Aug 12, 2013 at 9:55 AM, Anton Komarov anton.komarov@gmail.comwrote:
Tested several rtl dongles with linux 3.9.1 on Debian Jessie (testing) and got disappointing results 2 dongles simultaneously working ok if using 3 or more than 3rd dongle not working (1st and 2nd working ok)
in Debian Wheezy i did manage to run 5 dongles simultaneously (kernel 3.2) i suppose developers should pay attention to than fact. -- public PGP key http://pastebin.com/dqZqgyVE