My thanks to Mauro for his work on this device. Eager to try it, I built sources yesterday following directions on http://linuxtv.org/wiki/index.php/How_to_Obtain,_Build_and_Install_V4L-DVB_Device_Drivers My environment is Tinycore Linux 4.7.5: Linux box 3.0.21-tinycore #3021 SMP Sat Feb 18 11:54:11 EET 2012 i686 GNU/Linux The PC hangs (not even REISUB working) as soon as I plug my device in usb port. Killing udevd and loading one module a time, I found that the crash occurs exactly when I load dvb-usb-rtl28xxu.ko AND the device is plugged. I.e., to crash I just need to sudo modprobe dvb-usb-rtl28xxu and plug. My device is as from subject, with lsusb giving 0bda:2838. It looks like this: http://www.hamradioscience.com/wp-content/uploads/2012/10/R820T-560x420.jpg I am quite sure it has a r820t tuner because sdr.osmocom.org logs told me so, and because I managed to make it work (as a DVB-T receiver) by patching some r820t code for an old kernel, see http://www.spinics.net/lists/linux-media/msg57707.html. Lars Buerding recently reported success on a newer kernel, so it might be a backport problem. However, I had similar results on a fresh Debian Wheezy yesterday. I append 1) the crash log (used klogd spitting on a -o sync mounted device). 2) lsusb -v for the device Regards, Marco ********************************* ********************************* May 6 12:56:50 box user.info kernel: usb 1-4: new high speed USB device number 4 using ehci_hcd May 6 12:56:50 box user.err kernel: WARNING: You are using an experimental version of the media stack. May 6 12:56:50 box user.err kernel: As the driver is backported to an older kernel, it doesn't offer May 6 12:56:50 box user.err kernel: enough quality for its usage in production. May 6 12:56:50 box user.err kernel: Use it with care. May 6 12:56:50 box user.err kernel: Latest git patches (needed if you report a bug to linux-media@xxxxxxxxxxxxxxx): May 6 12:56:50 box user.err kernel: 02615ed5e1b2283db2495af3cf8f4ee172c77d80 [media] cx88: make core less verbose May 6 12:56:50 box user.err kernel: a3b60209e7dd4db05249a9fb27940bb6705cd186 [media] em28xx: fix oops at em28xx_dvb_bus_ctrl() May 6 12:56:50 box user.err kernel: 4494f0fdd825958d596d05a4bd577df94b149038 [media] s5c73m3: fix indentation of the help section in Kconfig May 6 12:56:50 box user.err kernel: WARNING: You are using an experimental version of the media stack. May 6 12:56:50 box user.err kernel: As the driver is backported to an older kernel, it doesn't offer May 6 12:56:50 box user.err kernel: enough quality for its usage in production. May 6 12:56:50 box user.err kernel: Use it with care. May 6 12:56:50 box user.err kernel: Latest git patches (needed if you report a bug to linux-media@xxxxxxxxxxxxxxx): May 6 12:56:50 box user.err kernel: 02615ed5e1b2283db2495af3cf8f4ee172c77d80 [media] cx88: make core less verbose May 6 12:56:50 box user.err kernel: a3b60209e7dd4db05249a9fb27940bb6705cd186 [media] em28xx: fix oops at em28xx_dvb_bus_ctrl() May 6 12:56:50 box user.err kernel: 4494f0fdd825958d596d05a4bd577df94b149038 [media] s5c73m3: fix indentation of the help section in Kconfig May 6 12:56:50 box user.info kernel: usb 1-4: dvb_usb_v2: found a 'Realtek RTL2832U reference design' in warm state May 6 12:56:50 box user.info kernel: usbcore: registered new interface driver dvb_usb_rtl28xxu May 6 12:56:50 box user.alert kernel: BUG: unable to handle kernel NULL pointer dereference at 00000028 May 6 12:56:50 box user.alert kernel: IP: [<f11e171d>] 0xf11e171d May 6 12:56:50 box user.warn kernel: *pde = 00000000 May 6 12:56:50 box user.emerg kernel: Oops: 0000 [#1] SMP May 6 12:56:50 box user.warn kernel: Modules linked in: dvb_usb_rtl28xxu dvb_usb_v2 rtl2830 dvb_core rc_core rt73usb rt2x00usb rt2x00lib mac80211 cfg80211 acpi_cpufreq cpufreq_userspace mperf cpufreq_stats cpufreq_powersave cpufreq_conservative squashfs scsi_wait_ May 6 12:56:50 box user.warn kernel: Pid: 52, comm: kworker/1:2 Tainted: P C 3.0.21-tinycore #3021 FUJITSU SIEMENS AMILO Li1705/AMILO Li1705 May 6 12:56:50 box user.warn kernel: EIP: 0060:[<f11e171d>] EFLAGS: 00010246 CPU: 1 May 6 12:56:50 box user.warn kernel: EAX: 00000000 EBX: ed07ff02 ECX: 00000000 EDX: ffffffff May 6 12:56:50 box user.warn kernel: ESI: ed232038 EDI: 00000000 EBP: eee06a00 ESP: ed901f54 May 6 12:56:50 box user.warn kernel: DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 May 6 12:56:50 box user.emerg kernel: Process kworker/1:2 (pid: 52, ti=ed900000 task=ed839030 task.ti=ed900000) May 6 12:56:50 box user.emerg kernel: Stack: May 6 12:56:50 box user.warn kernel: 00000000 ed232000 c05af00c eee03078 00000001 eee03030 243e1b2c 00000000 May 6 12:56:50 box user.warn kernel: ed8f2d80 ed232038 eee026c0 eee06a00 c013b0be eee02700 00000000 f11e1597 May 6 12:56:50 box user.warn kernel: eee06a05 ed8f2d80 eee026c0 ed8f2d90 ed839030 c013bc6f ed8f2d90 ee867f34 May 6 12:56:50 box user.emerg kernel: Call Trace: May 6 12:56:50 box user.warn kernel: [<c013b0be>] ? 0xc013b0be May 6 12:56:50 box user.warn kernel: [<f11e1597>] ? 0xf11e1597 May 6 12:56:50 box user.warn kernel: [<c013bc6f>] ? 0xc013bc6f May 6 12:56:50 box user.warn kernel: [<c013bbc6>] ? 0xc013bbc6 May 6 12:56:50 box user.warn kernel: [<c013e3a8>] ? 0xc013e3a8 May 6 12:56:50 box user.warn kernel: [<c013e345>] ? 0xc013e345 May 6 12:56:50 box user.warn kernel: [<c0417936>] ? 0xc0417936 May 6 12:56:50 box user.emerg kernel: Code: 00 00 8b 44 24 14 e8 54 fc ff ff 8b 43 c8 8b 50 70 83 c4 10 85 d2 74 10 8b 44 24 04 ff d2 85 c0 89 c7 0f 88 bd 06 00 00 8b 43 c8 May 6 12:56:50 box user.emerg kernel: 3> 78 28 00 74 67 8b 53 cc b9 30 00 00 00 8d 83 a8 01 00 00 8d May 6 12:56:50 box user.emerg kernel: EIP: [<f11e171d>] SS:ESP 0068:ed901f54 May 6 12:56:50 box user.emerg kernel: CR2: 0000000000000028 May 6 12:56:50 box user.warn kernel: ---[ end trace 604313c755d73a7e ]--- May 6 12:56:50 box user.alert kernel: BUG: unable to handle kernel paging request at fffffffc May 6 12:56:50 box user.alert kernel: IP: [<c013e501>] 0xc013e501 May 6 12:56:50 box user.warn kernel: *pde = 005b9067 *pte = 00000000 May 6 12:56:50 box user.emerg kernel: Oops: 0000 [#2] SMP May 6 12:56:50 box user.warn kernel: Modules linked in: dvb_usb_rtl28xxu dvb_usb_v2 rtl2830 dvb_core rc_core rt73usb rt2x00usb rt2x00lib mac80211 cfg80211 acpi_cpufreq cpufreq_userspace mperf cpufreq_stats cpufreq_powersave cpufreq_conservative squashfs scsi_wait_ May 6 12:56:50 box user.warn kernel: Pid: 52, comm: kworker/1:2 Tainted: P D C 3.0.21-tinycore #3021 FUJITSU SIEMENS AMILO Li1705/AMILO Li1705 May 6 12:56:50 box user.warn kernel: EIP: 0060:[<c013e501>] EFLAGS: 00010002 CPU: 1 May 6 12:56:50 box user.warn kernel: EAX: 00000000 EBX: eee05700 ECX: 00000001 EDX: 00000001 May 6 12:56:50 box user.warn kernel: ESI: 00000001 EDI: ed839030 EBP: ed839030 ESP: ed901dac May 6 12:56:50 box user.warn kernel: DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 May 6 12:56:50 box user.emerg kernel: Process kworker/1:2 (pid: 52, ti=ed900000 task=ed839030 task.ti=ed900000) May 6 12:56:50 box user.emerg kernel: Stack: May 6 12:56:50 box user.warn kernel: c013bf2a eee05700 00000000 ed839030 c0415549 ee824980 c01c7389 00000001 May 6 12:56:50 box user.warn kernel: c05b1700 ed8391c8 c05b1700 00000034 ee844650 ee844640 00000034 ed83858c May 6 12:56:50 box user.warn kernel: ed838584 ed83b040 00000002 ee803a40 00000246 c015fd31 ed839030 ed839030 May 6 12:56:50 box user.emerg kernel: Call Trace: May 6 12:56:50 box user.warn kernel: [<c013bf2a>] ? 0xc013bf2a May 6 12:56:50 box user.warn kernel: [<c0415549>] ? 0xc0415549 May 6 12:56:50 box user.warn kernel: [<c01c7389>] ? 0xc01c7389 May 6 12:56:50 box user.warn kernel: [<c015fd31>] ? 0xc015fd31 May 6 12:56:50 box user.warn kernel: [<c012e01b>] ? 0xc012e01b May 6 12:56:50 box user.warn kernel: [<c04158f7>] ? 0xc04158f7 May 6 12:56:50 box user.warn kernel: [<c012f3d5>] ? 0xc012f3d5 May 6 12:56:50 box user.warn kernel: [<c014dd19>] ? 0xc014dd19 May 6 12:56:50 box user.warn kernel: [<c0104d6b>] ? 0xc0104d6b May 6 12:56:50 box user.warn kernel: [<c0411f49>] ? 0xc0411f49 May 6 12:56:50 box user.warn kernel: [<c041209c>] ? 0xc041209c May 6 12:56:50 box user.warn kernel: [<c011ba09>] ? 0xc011ba09 May 6 12:56:50 box user.warn kernel: [<c0410001>] ? 0xc0410001 May 6 12:56:50 box user.warn kernel: [<c011b8c8>] ? 0xc011b8c8 May 6 12:56:50 box user.warn kernel: [<c041715a>] ? 0xc041715a May 6 12:56:50 box user.warn kernel: [<c011b8c8>] ? 0xc011b8c8 May 6 12:56:50 box user.warn kernel: [<f11e171d>] ? 0xf11e171d May 6 12:56:50 box user.warn kernel: [<c013b0be>] ? 0xc013b0be May 6 12:56:50 box user.warn kernel: [<f11e1597>] ? 0xf11e1597 May 6 12:56:50 box user.warn kernel: [<c013bc6f>] ? 0xc013bc6f May 6 12:56:50 box user.warn kernel: [<c013bbc6>] ? 0xc013bbc6 May 6 12:56:50 box user.warn kernel: [<c013e3a8>] ? 0xc013e3a8 May 6 12:56:50 box user.warn kernel: [<c013e345>] ? 0xc013e345 May 6 12:56:50 box user.warn kernel: [<c0417936>] ? 0xc0417936 May 6 12:56:50 box user.emerg kernel: Code: 89 f0 83 e0 1f c1 ee 05 8d 14 85 78 c1 41 c0 89 d8 c1 e6 02 29 f2 e8 0e ab fe ff 81 4b 0c 00 00 00 04 5b 5e c3 8b 80 6c 01 00 00 <8b> 40 fc c3 31 c0 c3 57 ba c6 ee 47 c0 56 53 64 8b 35 c4 d4 5a May 6 12:56:50 box user.emerg kernel: EIP: [<c013e501>] SS:ESP 0068:ed901dac May 6 12:56:50 box user.emerg kernel: CR2: 00000000fffffffc May 6 12:56:50 box user.warn kernel: ---[ end trace 604313c755d73a7f ]--- May 6 12:56:50 box user.alert kernel: Fixing recursive fault but reboot is needed! ********************************* ********************************* Bus 001 Device 006: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x0bda Realtek Semiconductor Corp. idProduct 0x2838 RTL2838 DVB-T bcdDevice 1.00 iManufacturer 1 Realtek iProduct 2 RTL2838UHIDIR iSerial 3 00000013 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 34 bNumInterfaces 2 bConfigurationValue 1 iConfiguration 4 USB2.0-Bulk&Iso bmAttributes 0x80 (Bus Powered) MaxPower 500mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 255 Vendor Specific Subclass bInterfaceProtocol 255 Vendor Specific Protocol iInterface 5 Bulk-In, Interface 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 0 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 255 Vendor Specific Subclass bInterfaceProtocol 255 Vendor Specific Protocol iInterface 5 Bulk-In, Interface Device Qualifier (for other device speed): bLength 10 bDescriptorType 6 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 bNumConfigurations 2 Device Status: 0x0000 (Bus Powered) -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
