https://bugs.kde.org/show_bug.cgi?id=400668

--- Comment #1 from Mauro Carvalho Chehab <mchehab+sams...@kernel.org> ---
(In reply to Ed from comment #0)
> SUMMARY
> 
> Must rescan for channels EVERY time I bring up Kaffeine.
>  
> After scanning for channels, I get a populated list and can display live TV
> as expected.  However, after exiting Kaffeine and immediately restarting the
> app, I can see the channel list but get the message "No device found".  But
> the device is in fact present and I can do another scan and watch
> programming.
> 
> I have two devices, a Hauppauge 1800 PCI and a Hauppauge 940Q.  I have used
> both these devices with Kaffeine previously to watch TV.  However, after
> moving from Mint 19 Cinnamon to Mint 19 Xfce, something has gone amiss.
> 
> STEPS TO REPRODUCE
> 1.  Scan for channels, watch TV. 
> 2.  Exit Kaffeine, restart Kaffeine.
> 3.  Message "No device found.
> 
> OBSERVED RESULT
> No device found, but device is available

That sounds really weird. Re-scan shouldn't even work if the device was not
found.

Hmm... I remember that there were some issue in the past related to both the
error message and some specific DVB-S situations:

f83a71be4a1e dvbliveview: improve error message when DVB device is not set
daa7865398d0 dvbmanager: Improve config.dvb parsing error message
26d6ce62732b dvbmanager: higherVoltage exists only for DVB-S

Those patches were applied to version 2.0.15.

Could you please test Kaffeine from git?

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