No DVB-T channels found

[Steu851]

I am migrating my HTPC from windows 10 to Ubuntu 25.04.
On windows side Next PVR works fine, I have installed it under Ubuntu (same hardware, dual boot) and after some issue finally installation completed and I can access NextPVR conf web page.
It detect TV Tuner as "adapter0/frontend0 (Silicon Labs Si2168)" I start channel scan with "It-All" country (I live in Italy) but it doesn't find any channel.
Into the log file I can see all frequency tested but without any channel found.
----------
2025-05-02 18:39:52:012 [DEBUG] Scanning from /usr/share/dvb/dvb-t/it-All
2025-05-02 18:39:52:012 [DEBUG] Channel config will be saved to /var/opt/nextpvr/adapter0-DVB-T-channels-scan.conf
2025-05-02 18:39:52:087 [DEBUG] >>> Scanning@next
2025-05-02 18:39:52:087 [DEBUG] >>> Scanning 177500000
2025-05-02 18:39:56:112 [DEBUG] >>> Scanning@continue3
2025-05-02 18:39:56:113 [DEBUG] >>> Scanning@next
2025-05-02 18:39:56:113 [DEBUG] >>> Scanning 184500000
......
----------
Can someone  help me?
Thanks
Thanksadapter0/frontend0 (Silicon Labs Si2168)

[mvallevand]

Detecting the adapter is only part of the install, check dmesg for any missing firmware message like this https://forums.nextpvr.com/showthread.ph...#pid600433

Martin

[bgowland]

Open a Terminal and redirect output of dmesg as follows...

Code:

sudo dmesg > dmesg.txt

Zip and attach the txt file here.

Cheers,
Brian

[Steu851]

thank you, firmware missing was the problem, found, installed an now it works

[DoctorOctagonapus]

Anyone here in the future who also owns a Si2168-based tuner and is wondering why no channels are appearing even after they've downloaded firmware, you also need dvb-tuner-si2141-a10-01.fw in your /lib/firmware directory. dmesg didn't say a thing about that one, it wasn't until I found it mentioned on a random page and grabbed it just in case.

[VictoryFox]

Anyone here in the future who also owns a Si2168-based tuner and is wondering why no channels are appearing even after they've downloaded firmware, you also need dvb-tuner-si2141-a10-01.fw in your /lib/firmware directory. dmesg didn't say a thing about that one, it wasn't until I found it mentioned on a random page and grabbed it just in case.

I've just bought a Si2168-based tuner (a T230C ) and have hit the same issue as the OP on this thread. I see no channels at all when I scan. I've set up the firmware as mentioned and based on dmesg it seems to load without error:

Code:

[  915.313089] usb 1-5: DVB: adapter 0 frontend 0 frequency 0 out of range (48000000..870000000)
[ 1043.250900] si2168 0-0064: firmware: direct-loading firmware dvb-demod-si2168-d60-01.fw
[ 1043.250906] si2168 0-0064: downloading firmware from file 'dvb-demod-si2168-d60-01.fw'
[ 1043.652304] si2168 0-0064: firmware version: D 6.0.2
[ 1084.110385] si2168 0-0064: firmware: direct-loading firmware dvb-demod-si2168-d60-01.fw
[ 1084.110391] si2168 0-0064: downloading firmware from file 'dvb-demod-si2168-d60-01.fw'
[ 1084.513657] si2168 0-0064: firmware version: D 6.0.2]

If I run "w_scan_cpp -c RS" on the machine my DVB tuner finds 31 channels. So it seems to me that the tuner HW is loaded and working correctly because it can find channels when not using NextPVR.

As this is my first time trying to set up NextPVR, there may be something I'm missing? I scan the channels with the "auto-Default" setting as there is no "RS" option from the drop down. Could that be the issue, and if so how can I remedy it? This is on a clean Linux install.

[mvallevand]

Right it doesn't appear to be the same problem so you should really have opened a new thread with the zipped logs so we can help. Also note Serbia has DVB-T DVB-C and DVB-S

The reason for now RS coptions is Linux is supported by users and no one from Serbai si bothering thing to keep it up to data. Based on this page https://viewersvault.com/List_of_terrest...ala_Tower) this might work. However there is a nuance that site notes there is no LCN so I am not sure what that will mean for the scan. If it doesn't work open a new thread with zipped logs.

Code:

[MUX1]
        DELIVERY_SYSTEM = DVBT2
        FREQUENCY = 482000000
        BANDWIDTH_HZ = 8000000
        CODE_RATE_HP = 1/2
        CODE_RATE_LP = NONE
        MODULATION = QPSK
        TRANSMISSION_MODE =2K
        GUARD_INTERVAL = 1/32
        HIERARCHY = NONE
        INVERSION = AUTO

[MUX2]
        DELIVERY_SYSTEM = DVBT2
        FREQUENCY = 530000000
        BANDWIDTH_HZ = 8000000
        CODE_RATE_HP = 1/2
        CODE_RATE_LP = NONE
        MODULATION = QPSK
        TRANSMISSION_MODE =2K
        GUARD_INTERVAL = 1/32
        HIERARCHY = NONE
        INVERSION = AUTO
[MUX3]
        DELIVERY_SYSTEM = DVBT2
        FREQUENCY = 666000000
        BANDWIDTH_HZ = 8000000
        CODE_RATE_HP = 1/2
        CODE_RATE_LP = NONE
        MODULATION = QPSK
        TRANSMISSION_MODE =2K
        GUARD_INTERVAL = 1/32
        HIERARCHY = NONE
        INVERSION = AUTO

Martin

[bgowland]

As this is my first time trying to set up NextPVR, there may be something I'm missing? I scan the channels with the "auto-Default" setting as there is no "RS" option from the drop down. Could that be the issue, and if so how can I remedy it? This is on a clean Linux install.

You could try auto-With167KHzOffset which tries all UHF frequencies but also with +/- 167KHx offsets.

Cheers,
Brian