I'm having trouble with two DVB-T2 tuners that have similar hardware and work well separately but cause trouble when attached at the same time. These are the two receviers:
1. TechnoTrend TVStick CT2-4400 (bus ID 0b48:3014)
2. Hauppauge WinTV SoloHD (bus ID 2040:8268)
Booting with both devices attached shows the following lines in dmesg:
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[Di Jan 8 12:45:41 2019] em28xx 1-4:1.0: New device HCW soloHD @ 480 Mbps (2040:8268, interface 0, class 0)
[Di Jan 8 12:45:41 2019] em28xx 1-4:1.0: DVB interface 0 found: bulk
[Di Jan 8 12:45:41 2019] em28xx 1-4:1.0: chip ID is em28178
[Di Jan 8 12:45:41 2019] usb 1-3: dvb_usb_v2: found a 'TechnoTrend TVStick CT2-4400' in warm state
[Di Jan 8 12:45:41 2019] usb 1-3: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
[Di Jan 8 12:45:41 2019] dvbdev: DVB: registering new adapter (TechnoTrend TVStick CT2-4400)
[Di Jan 8 12:45:41 2019] usb 1-3: dvb_usb_v2: MAC address: bc:ea:2b:44:0f:89
[Di Jan 8 12:45:41 2019] i2c i2c-6: Added multiplexed i2c bus 7
[Di Jan 8 12:45:41 2019] si2168 6-0064: Silicon Labs Si2168-B40 successfully identified
[Di Jan 8 12:45:41 2019] si2168 6-0064: firmware version: B 4.0.2
[Di Jan 8 12:45:41 2019] si2157 7-0060: Silicon Labs Si2147/2148/2157/2158 successfully attached
[Di Jan 8 12:45:41 2019] usb 1-3: DVB: registering adapter 0 frontend 0 (Silicon Labs Si2168)...
[Di Jan 8 12:45:41 2019] usb 1-3: dvb_usb_v2: 'TechnoTrend TVStick CT2-4400' successfully initialized and connected
[Di Jan 8 12:45:41 2019] usbcore: registered new interface driver dvb_usb_dvbsky
[Di Jan 8 12:45:43 2019] em28xx 1-4:1.0: EEPROM ID = 26 00 01 00, EEPROM hash = 0xccc2c180
[Di Jan 8 12:45:43 2019] em28xx 1-4:1.0: EEPROM info:
[Di Jan 8 12:45:43 2019] em28xx 1-4:1.0: microcode start address = 0x0004, boot configuration = 0x01
[Di Jan 8 12:45:43 2019] em28xx 1-4:1.0: AC97 audio (5 sample rates)
[Di Jan 8 12:45:43 2019] em28xx 1-4:1.0: 500mA max power
[Di Jan 8 12:45:43 2019] em28xx 1-4:1.0: Table at offset 0x27, strings=0x0e6a, 0x1888, 0x087e
[Di Jan 8 12:45:43 2019] em28xx 1-4:1.0: Identified as PCTV tripleStick (292e) (card=94)
[Di Jan 8 12:45:43 2019] em28xx 1-4:1.0: dvb set to bulk mode.
[Di Jan 8 12:45:43 2019] usbcore: registered new interface driver em28xx
[Di Jan 8 12:45:43 2019] em28xx 1-4:1.0: Binding DVB extension
[Di Jan 8 12:45:43 2019] i2c i2c-9: Added multiplexed i2c bus 10
[Di Jan 8 12:45:43 2019] si2168 9-0064: Silicon Labs Si2168-B40 successfully identified
[Di Jan 8 12:45:43 2019] si2168 9-0064: firmware version: B 4.0.2
[Di Jan 8 12:45:43 2019] si2157 10-0060: Silicon Labs Si2147/2148/2157/2158 successfully attached
[Di Jan 8 12:45:43 2019] dvbdev: DVB: registering new adapter (1-4:1.0)
[Di Jan 8 12:45:43 2019] em28xx 1-4:1.0: DVB: registering adapter 1 frontend 0 (Silicon Labs Si2168)...
[Di Jan 8 12:45:43 2019] em28xx 1-4:1.0: DVB extension successfully initialized
[Di Jan 8 12:45:43 2019] em28xx: Registered (Em28xx dvb Extension) extension
[Di Jan 8 12:45:45 2019] e1000e: enp0s25 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
[Di Jan 8 12:45:45 2019] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s25: link becomes ready
[Di Jan 8 12:45:45 2019] si2168 6-0064: firmware: direct-loading firmware dvb-demod-si2168-b40-01.fw
[Di Jan 8 12:45:45 2019] si2168 6-0064: downloading firmware from file 'dvb-demod-si2168-b40-01.fw'
[Di Jan 8 12:45:46 2019] si2168 6-0064: firmware version: B 4.0.11
[Di Jan 8 12:45:46 2019] si2157 7-0060: found a 'Silicon Labs Si2157-A30'
[Di Jan 8 12:45:46 2019] si2157 7-0060: firmware version: 3.0.5
[Di Jan 8 12:45:46 2019] si2168 9-0064: firmware: direct-loading firmware dvb-demod-si2168-b40-01.fw
[Di Jan 8 12:45:46 2019] si2168 9-0064: downloading firmware from file 'dvb-demod-si2168-b40-01.fw'
[Di Jan 8 12:45:46 2019] si2168 9-0064: firmware version: B 4.0.11
[Di Jan 8 12:45:46 2019] si2157 10-0060: found a 'Silicon Labs Si2157-A30'
[Di Jan 8 12:45:46 2019] si2157 10-0060: firmware version: 3.0.5
[Di Jan 8 12:46:46 2019] dmxdev: DVB (dvb_dmxdev_filter_start): could not set feed
[Di Jan 8 12:46:46 2019] dvb_demux: dvb_demux_feed_del: feed not in list (type=1 state=0 pid=ffff)
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Jan 08 12:36:08 mypc kernel: sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:14.0/usb1/1-3/dvb'
Jan 08 12:36:08 mypc kernel: CPU: 2 PID: 19877 Comm: modprobe Not tainted 4.19.0-1-amd64 #1 Debian 4.19.12-1
Jan 08 12:36:08 mypc kernel: Hardware name: /NUC5i3RYB, BIOS RYBDWi35.86A.0371.2018.0709.1155 07/09/2018
Jan 08 12:36:08 mypc kernel: Call Trace:
Jan 08 12:36:08 mypc kernel: dump_stack+0x5c/0x80
Jan 08 12:36:08 mypc kernel: sysfs_warn_dup.cold.4+0x17/0x2a
Jan 08 12:36:08 mypc kernel: sysfs_create_dir_ns+0xa7/0xd0
Jan 08 12:36:08 mypc kernel: kobject_add_internal+0xbc/0x270
Jan 08 12:36:08 mypc kernel: kobject_add+0x7d/0xb0
Jan 08 12:36:08 mypc kernel: ? _cond_resched+0x15/0x30
Jan 08 12:36:08 mypc kernel: ? kmem_cache_alloc_trace+0x155/0x1d0
Jan 08 12:36:08 mypc kernel: get_device_parent.isra.29+0x197/0x1c0
Jan 08 12:36:08 mypc kernel: device_add+0xea/0x690
Jan 08 12:36:08 mypc kernel: device_create_groups_vargs+0xd1/0xf0
Jan 08 12:36:08 mypc kernel: device_create+0x49/0x60
Jan 08 12:36:08 mypc kernel: ? _cond_resched+0x15/0x30
Jan 08 12:36:08 mypc kernel: ? kmem_cache_alloc_trace+0x155/0x1d0
Jan 08 12:36:08 mypc kernel: dvb_register_device+0x229/0x2c0 [dvb_core]
Jan 08 12:36:08 mypc kernel: dvb_usbv2_probe+0x54d/0x10d0 [dvb_usb_v2]
Jan 08 12:36:08 mypc kernel: ? __pm_runtime_set_status+0x247/0x260
Jan 08 12:36:08 mypc kernel: usb_probe_interface+0xe4/0x2f0 [usbcore]
Jan 08 12:36:08 mypc kernel: really_probe+0x235/0x3a0
Jan 08 12:36:08 mypc kernel: driver_probe_device+0xb3/0xf0
Jan 08 12:36:08 mypc kernel: __driver_attach+0xdd/0x110
Jan 08 12:36:08 mypc kernel: ? driver_probe_device+0xf0/0xf0
Jan 08 12:36:08 mypc kernel: bus_for_each_dev+0x76/0xc0
Jan 08 12:36:08 mypc kernel: ? klist_add_tail+0x3b/0x70
Jan 08 12:36:08 mypc kernel: bus_add_driver+0x152/0x230
Jan 08 12:36:08 mypc kernel: driver_register+0x6b/0xb0
Jan 08 12:36:08 mypc kernel: usb_register_driver+0x7a/0x130 [usbcore]
Jan 08 12:36:08 mypc kernel: ? 0xffffffffc09e5000
Jan 08 12:36:08 mypc kernel: do_one_initcall+0x46/0x1c3
Jan 08 12:36:08 mypc kernel: ? free_unref_page_commit+0x91/0x100
Jan 08 12:36:08 mypc kernel: ? _cond_resched+0x15/0x30
Jan 08 12:36:08 mypc kernel: ? kmem_cache_alloc_trace+0x155/0x1d0
Jan 08 12:36:08 mypc kernel: do_init_module+0x5a/0x210
Jan 08 12:36:08 mypc kernel: load_module+0x215c/0x2380
Jan 08 12:36:08 mypc kernel: ? __do_sys_finit_module+0xad/0x110
Jan 08 12:36:08 mypc kernel: __do_sys_finit_module+0xad/0x110
Jan 08 12:36:08 mypc kernel: do_syscall_64+0x53/0x100
Jan 08 12:36:08 mypc kernel: entry_SYSCALL_64_after_hwframe+0x44/0xa9
Jan 08 12:36:08 mypc kernel: RIP: 0033:0x7f3029f62309
Jan 08 12:36:08 mypc kernel: Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
Jan 08 12:36:08 mypc kernel: RSP: 002b:00007ffefc69b4c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
Jan 08 12:36:08 mypc kernel: RAX: ffffffffffffffda RBX: 0000555d0528bde0 RCX: 00007f3029f62309
Jan 08 12:36:08 mypc kernel: RDX: 0000000000000000 RSI: 0000555d0528ebd0 RDI: 0000000000000006
Jan 08 12:36:08 mypc kernel: RBP: 0000555d0528ebd0 R08: 0000000000000000 R09: 0000000000000000
Jan 08 12:36:08 mypc kernel: R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000000
Jan 08 12:36:08 mypc kernel: R13: 0000555d0528be60 R14: 0000000000040000 R15: 0000555d0528bde0
Jan 08 12:36:08 mypc kernel: kobject_add_internal failed for dvb with -EEXIST, don't try to register things with the same name in the same directory.
Jan 08 12:36:08 mypc kernel: dvbdev: dvb_register_device: failed to create device dvb0.net0 (-17)
Jan 08 12:36:08 mypc kernel: usb 1-3: dvb_usb_v2: dvb_net_init() failed=-17
Jan 08 12:36:08 mypc kernel: dvb_usb_dvbsky: probe of 1-3:1.0 failed with error -17
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dvb_usb_v2
dvb_usb_dvbsky
em28xx
em28xx_dvb
dvb_core
m88ds3103
si2157
si2168
I have no idea how to solve this. Unfortunately the first tuner isn't available any more and I could only return the second one.
Regards, Piotrusch