Do you have the same behaviour when the kernel drivers aren't loaded ? It's generelly recommended to blacklist all the rtl* related kernel drivers when you don't need them ... /etc/modprobe.d/99-blacklist-rtlsdr.conf ---------------------------------------- # blacklist rtlsdr blacklist dvb_usb_rtl28xxu blacklist dvb_usb_v2 blacklist rtl_2830 blacklist rtl_2832 blacklist rtl2832_sdr blacklist r820t ----------------------------------------