Re: Rpi4B needs power off reboot for TV hat

On 12/06/2025 09:01, Richard Kettlewell wrote:

Joerg Walther <joerg.walther@magenta.de> writes:

The Natural Philosopher wrote:

 

Finally identified something I had been suspecting for some time.
Issuing a 'reboot' command results in tvheadend unable to find the DVB
adapter, but a power off reset finds it.

>
I had similar behaviour with a network card some while ago. Apparently
the reboot leaves the device in a state which makes it impossible for
the OS to detect it after the reboot. This actually is a bug in the
driver for the adapter, which you could report to the maintainer. When
you switch if off completely, "something" is set to standard values,
thus making the DVB adapter again available for the OS.

 That sounds more like a bug in the device? i.e. not honoring the
reset signal from the host after reboot.
 

Well hardware and software always blame each other :-)
In the end though, its the software's job to sort it out.
Wouldn't be the first time I've seen software engaging in some complex shenanigans to overcome a hardware default.
A unix that wouldn't boot untril I phoned the company themselves in the USA who listened patently while I read out the onscreen information.
"Ah., Its hung checking for the maths co processor"
"What maths co processor?"
"the one that should have a jumper saying if its not there"
"Are you sure, how do you know"
"I know because I wrote the boot script"
Windows booted perfectly on the unit. Irrespective of jumper setting.
--
“Puritanism: The haunting fear that someone, somewhere, may be happy.”
H.L. Mencken, A Mencken Chrestomathy