Partial Lock

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williamatwood
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Posts: 45
Joined: Sun Feb 12, 2017 8:08 pm
Canada

Partial Lock

Post by williamatwood » Tue Feb 23, 2021 2:56 am

When attempting to watch a channel (any channel), I get the following message
Signal 100%|S/N 2.5 dB|BE 0|(TL___) Partial Lock

mythbackend version: fixes/0.28 [v0.28.2-6-g9031599] www.mythtv.org
OS Version: Ubuntu 16.04.7 LTS
Tuner: Hauppauge WinTV-HVR-955Q

Signal path:
UHF antenna on roof -> amplifier -> combiner -> 50 foot cable -> power inserter -> splitter
VHF antenna on roof --------------------^
The splitter goes to the TV and the 955Q

Swapping the TV and the 955Q wires has no effect.

All (local) channels come into the TV at 100%, and display with no dropouts.

I can find diagnostic tools for DVB under Linux, but this is ATSC.
Does anyone have any ideas for how to troubleshoot?

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kmdewaal
Developer
Posts: 250
Joined: Wed Dec 07, 2016 8:01 pm
Netherlands

Re: Partial Lock

Post by kmdewaal » Tue Feb 23, 2021 7:28 am

It could be that your tuner needs firmware and that this firmware is not present. Look at the "dmesg" output for messages from your tuner.

williamatwood
Junior
Posts: 45
Joined: Sun Feb 12, 2017 8:08 pm
Canada

Re: Partial Lock

Post by williamatwood » Wed Feb 24, 2021 2:19 am

Thank you. dmesg showed that the utility that manages the card had failed to allocate a buffer. So, the solution was to re-boot the computer.

One line in dmesg did seem strange:

[ 14.812035] cx231xx 2-3:1.1: Unknown tuner type configuring SIF

Is this an indication that I should be upgrading something?

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kmdewaal
Developer
Posts: 250
Joined: Wed Dec 07, 2016 8:01 pm
Netherlands

Re: Partial Lock

Post by kmdewaal » Wed Feb 24, 2021 7:23 am

Also the reference dmesg output in https://www.linuxtv.org/wiki/index.php/ ... V-HVR-955Q shows this message.
It is possibly related to the analog part of the device which is not supported in Linux as I understand it.
If your device works OK then do not worry!

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