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JJ jjvonblack at riseup.netHi everyone, Thanks for the osmo-fl2k gift! Unfortunately it seems I'm experiencing the same issue as the one reported by the original poster. I've compiled osmo-fl2k from source[1] and run it on Ubuntu 16.04 x86_64 both on a notebook and a desktop PC (with USB 3 ports) without noticing any detectable RF activity[2]. Is there any way to debug/tackle the issue? Is it VGA adapter dependent? Here are more information: dmesg: usb 2-1: new high-speed USB device number 7 using xhci_hcd usb 2-1: New USB device found, idVendor=1d5c, idProduct=2000 usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 $ timeout 120s fl2k_test -s 162e6 Reporting PPM error measurement every 10 seconds... Press ^C after a few minutes. Signal caught, exiting! User cancel, exiting... real sample rate: 15018460 current PPM: -907293 cumulative PPM: -907293 real sample rate: 15018133 current PPM: -907295 cumulative PPM: -907294 real sample rate: 15018646 current PPM: -907292 cumulative PPM: -907294 real sample rate: 15018427 current PPM: -907294 cumulative PPM: -907294 real sample rate: 15018391 current PPM: -907294 cumulative PPM: -907294 real sample rate: 15018312 current PPM: -907294 cumulative PPM: -907294 real sample rate: 15018434 current PPM: -907294 cumulative PPM: -907294 real sample rate: 15018472 current PPM: -907293 cumulative PPM: -907294 real sample rate: 15018498 current PPM: -907293 cumulative PPM: -907294 real sample rate: 15018216 current PPM: -907295 cumulative PPM: -907294 real sample rate: 15018345 current PPM: -907294 cumulative PPM: -907294 $ timeout 120s fl2k_test -s 100e6 Reporting PPM error measurement every 10 seconds... Press ^C after a few minutes. Signal caught, exiting! User cancel, exiting... real sample rate: 15018468 current PPM: -849815 cumulative PPM: -849815 real sample rate: 15018365 current PPM: -849816 cumulative PPM: -849816 real sample rate: 15018384 current PPM: -849816 cumulative PPM: -849816 real sample rate: 15018349 current PPM: -849817 cumulative PPM: -849816 real sample rate: 15018350 current PPM: -849816 cumulative PPM: -849816 real sample rate: 15018447 current PPM: -849816 cumulative PPM: -849816 real sample rate: 15018135 current PPM: -849819 cumulative PPM: -849816 real sample rate: 15018684 current PPM: -849813 cumulative PPM: -849816 real sample rate: 15018346 current PPM: -849817 cumulative PPM: -849816 real sample rate: 15018375 current PPM: -849816 cumulative PPM: -849816 real sample rate: 15018317 current PPM: -849817 cumulative PPM: -849816 $ timeout 120s fl2k_test -s 50e6 Reporting PPM error measurement every 10 seconds... Press ^C after a few minutes. Signal caught, exiting! User cancel, exiting... real sample rate: 15018520 current PPM: -699630 cumulative PPM: -699630 real sample rate: 15018385 current PPM: -699632 cumulative PPM: -699631 real sample rate: 15018272 current PPM: -699635 cumulative PPM: -699632 real sample rate: 15018553 current PPM: -699629 cumulative PPM: -699631 real sample rate: 15018344 current PPM: -699633 cumulative PPM: -699632 real sample rate: 15018424 current PPM: -699632 cumulative PPM: -699632 real sample rate: 15018236 current PPM: -699635 cumulative PPM: -699632 real sample rate: 15018548 current PPM: -699629 cumulative PPM: -699632 real sample rate: 15018338 current PPM: -699633 cumulative PPM: -699632 real sample rate: 15018347 current PPM: -699633 cumulative PPM: -699632 real sample rate: 15018426 current PPM: -699631 cumulative PPM: -699632 $ timeout 120s fl2k_test -s 15e6 Reporting PPM error measurement every 10 seconds... Press ^C after a few minutes. Signal caught, exiting! User cancel, exiting... real sample rate: 15000126 current PPM: 8 cumulative PPM: 8 real sample rate: 15000152 current PPM: 10 cumulative PPM: 9 real sample rate: 15000230 current PPM: 15 cumulative PPM: 11 real sample rate: 15000151 current PPM: 10 cumulative PPM: 11 real sample rate: 15000273 current PPM: 18 cumulative PPM: 13 real sample rate: 14999886 current PPM: -8 cumulative PPM: 9 real sample rate: 15000499 current PPM: 33 cumulative PPM: 13 real sample rate: 15000221 current PPM: 15 cumulative PPM: 13 real sample rate: 15000182 current PPM: 12 cumulative PPM: 13 real sample rate: 15000234 current PPM: 16 cumulative PPM: 13 real sample rate: 15000160 current PPM: 11 cumulative PPM: 13 $ sudo lsusb -d 1d5c:2000 -vv Bus 002 Device 004: ID 1d5c:2000 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.10 bDeviceClass 239 Miscellaneous Device bDeviceSubClass 2 ? bDeviceProtocol 1 Interface Association bMaxPacketSize0 64 idVendor 0x1d5c idProduct 0x2000 bcdDevice 2.00 iManufacturer 0 iProduct 0 iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 269 bNumInterfaces 3 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 98mA Interface Association: bLength 8 bDescriptorType 11 bFirstInterface 0 bInterfaceCount 3 bFunctionClass 14 Video bFunctionSubClass 1 Video Control bFunctionProtocol 3 iFunction 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 16 bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 1 bNumEndpoints 2 bInterfaceClass 16 bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 0 ** UNRECOGNIZED: 04 21 00 01 ** UNRECOGNIZED: 06 25 01 00 00 00 ** UNRECOGNIZED: 06 25 02 00 00 00 ** UNRECOGNIZED: 0a 22 01 00 05 00 02 00 00 00 ** UNRECOGNIZED: 06 25 01 00 00 00 ** UNRECOGNIZED: 0a 22 02 00 10 00 14 00 0d 00 ** UNRECOGNIZED: 0a 23 03 00 0d 00 05 00 00 00 ** UNRECOGNIZED: 06 25 02 00 01 00 ** UNRECOGNIZED: 10 26 01 00 00 00 00 00 64 00 00 00 01 00 00 00 ** UNRECOGNIZED: 0a 24 01 00 14 00 00 00 00 00 ** UNRECOGNIZED: 06 25 03 00 01 00 ** UNRECOGNIZED: 0a 24 02 00 02 00 00 00 00 00 ** UNRECOGNIZED: 06 25 03 00 01 00 ** UNRECOGNIZED: 06 25 0c 00 00 00 ** UNRECOGNIZED: 06 25 09 00 02 00 ** UNRECOGNIZED: 06 25 0b 00 01 00 ** UNRECOGNIZED: 14 27 00 00 01 00 3c 00 01 00 02 00 03 00 00 00 00 00 02 00 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 16 bInterfaceSubClass 2 bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 1 bNumEndpoints 4 bInterfaceClass 16 bInterfaceSubClass 2 bInterfaceProtocol 1 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 25 Transfer Type Isochronous Synch Type Adaptive Usage Type Feedback wMaxPacketSize 0x0004 1x 4 bytes bInterval 7 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 9 Transfer Type Isochronous Synch Type Adaptive Usage Type Data wMaxPacketSize 0x1400 3x 1024 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 16 bInterfaceSubClass 2 bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x83 EP 3 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 1 Binary Object Store Descriptor: bLength 5 bDescriptorType 15 wTotalLength 22 bNumDeviceCaps 2 USB 2.0 Extension Device Capability: bLength 7 bDescriptorType 16 bDevCapabilityType 2 bmAttributes 0x00000002 Link Power Management (LPM) Supported SuperSpeed USB Device Capability: bLength 10 bDescriptorType 16 bDevCapabilityType 3 bmAttributes 0x00 wSpeedsSupported 0x000c Device can operate at High Speed (480Mbps) Device can operate at SuperSpeed (5Gbps) bFunctionalitySupport 2 Lowest fully-functional device speed is High Speed (480Mbps) bU1DevExitLat 10 micro seconds bU2DevExitLat 20 micro seconds Device Status: 0x0000 (Bus Powered) $ sudo lspci -s 00:14.0 -vv 00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04) (prog-if 30 [XHCI]) Subsystem: Dell 8 Series USB xHCI HC Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 42 Region 0: Memory at f7d00000 (64-bit, non-prefetchable) [size=64K] Capabilities: [70] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0-,D1-,D2-,D3hot+,D3cold+) Status: D0 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME+ Capabilities: [80] MSI: Enable+ Count=1/8 Maskable- 64bit+ Address: 00000000fee002b8 Data: 0000 Kernel driver in use: xhci_hcd [1]: osmo-fl2k, commit d5c4dcc59750052a1a95b5185aca3548a5b951de. [2]: apart from the signal on 7.5 MHz generated by `fl2k_test -s 15e6`. Thanks, JJ