[mythtv-users] Udev

Bill Meek keemllib at gmail.com
Wed Nov 28 21:34:33 UTC 2018


On 11/28/18 2:51 PM, Daryl McDonald wrote:
> On Wed, Nov 28, 2018 at 3:48 PM Bill Meek <keemllib at gmail.com> wrote:
> 
>> On 11/28/18 2:16 PM, Daryl McDonald wrote:
>>>>
>>>> Yes:  udevadm info -a -p $(udevadm info -q path -n
>> /dev/dvb/adapter0/dvr0)
>>>>
>>> Further testing, running the above command with only one tuner installed
>> at
>>> a time shows unique info for the two HP cards and identical info for the
>>> two PC800i cards. Would it be functional to have three Udev rules and
>> allow
>>> the second PC800i card to be labelled  what-ever?
>>
>> I *think* you'd be happy with a single rule. The question mark on the
>> KERNEL line
>> gets both of my tuners.
>>
>> Here's my rule for a single HVR-2200 card that has two tuners on it. Both
>> record
>> ATSC (not on different sources.) There's no unique information about the
>> tuners.
>>
>> SUBSYSTEM=="dvb", \
>>       KERNEL=="dvb?.frontend0", \
>>       ATTRS{subsystem_vendor}=="0x0070", \
>>       ATTRS{subsystem_device}=="0x8851", \
>>       SYMLINK+="dvb/hvr-2200-$minor", \
>>       TAG+="systemd"
>>
>> #Creates:
>> # lrwxrwxrwx 1 root root 18 Dec 27 23:27 /dev/dvb/hvr-2200-0 ->
>> adapter0/frontend0
>> # lrwxrwxrwx 1 root root 18 Dec 27 23:27 /dev/dvb/hvr-2200-4 ->
>> adapter1/frontend0
>>
>>     looking at device
>> '/devices/pci0000:00/0000:00:1c.4/0000:04:00.0/dvb/dvb0.frontend0':
>>       KERNEL=="dvb0.frontend0"
>>       SUBSYSTEM=="dvb"
>>       DRIVER==""
>>
>>     looking at device
>> '/devices/pci0000:00/0000:00:1c.4/0000:04:00.0/dvb/dvb1.frontend0':
>>       KERNEL=="dvb1.frontend0"
>>       SUBSYSTEM=="dvb"
>>       DRIVER==""
> 
> So what name do your tuners get? Can you tell which one recorded what?

Maybe my idea of name is different from yours. It's not automatic, just a
choice.

In backend setup, I just set Display name = ATSC-0.0 and ATSC-0.1 for the 1st
tuner (it has Max recordings set to two.) The 2nd one is ATSC-1.0 etc. I
suppose they could get reversed at boot time. To prevent that, Ian's earlier
suggestion sounds like it a good solution. I've not tried it.


-- 
Bill


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