[mythtv-users] Kernel Crash when starting up in au0828-video.c line 895

[Mark Lord]

On 12-04-08 04:01 PM, Mark Lord wrote:
> On 12-04-08 02:34 AM, f-myth-users at media.mit.edu wrote:
>>     > Date: Sat, 07 Apr 2012 20:56:23 -0400
>>     > From: Mark Lord <mythtv at rtr.ca>
>>
>>     > I should add that, even with the above workarounds, there is STILL an issue
>>     > when mythbackend starts up:  If you have "multi-rec" enabled (more than one
>>     > virtual tuner per physical HVR-950Q), then the backend will have several
>>     > near-simultaneous "tune to initial channel" calls into the drivers.
>>
>>     > This will cause tuner failure.
>>
>> I haven't been following this thread closely (not my hardware), but
>> would it be possible to tune using an external tuner script that uses
>> a mutex and some sleeps to avoid simultaneous tunes?  I have no idea
>> if the way multirec tunes this hardware is amenable to breaking it
>> out externally like that.
> 
> Mythtv doesn't offer external channel change scripts for all digital tuners,
> dunno if it has the option for the 950Q or not.
> 
> But the place for the mutex is somewhere in one of the drivers that manages
> the 950Q, probably in the au0828 driver.  At some point I suspect I'll go in
> there and just fix the danged thing myself.  But for now, disabling multirec
> keeps it working well enough.

Another related thing might be to fix mythbackend to NOT issue channel tuning
requests to virtual tuners when the physical tuner is already tuned appropriately.