Re: cx5000 default auto sleep mode

["Timothy D. Lenz" <tlenz@vorgon.com>]

On 4/14/2010 10:40 AM, Devin Heitmueller wrote:
> On Wed, Apr 14, 2010 at 1:29 PM, Timothy D. Lenz<tlenz@vorgon.com>  wrote:
>> Thanks to Andy Walls, found out why I kept loosing 1 tuner on a FusionHD7
>> Dual express. Didn't know linux supported an auto sleep mode on the tuner
>> chips and that it defaulted to on. Seems like it would be better to default
>> to off. If someone wants an auto power down/sleep mode and their software
>> supports it, then let the program activate it. Seems people are more likely
>> to want the tuners to stay on then keep shutting down.
>>
>> Spent over a year trying to figure out why vdr would loose control of 1 of
>> the dual tuners when the atscepg pluging was used thinking it was a problem
>> with the plugin.
>
> The xc5000 power management changes I made were actually pretty
> thoroughly tested with that card (between myself and Michael Krufky,
> we tested it with just about every card that uses the tuner).  In
> fact, we uncovered several power management bugs in other drivers as a
> result of that effort.  It was a grueling effort that I spent almost
> three months working on.
>
> Generally I agree with the premise that functionality like this should
> only be enabled for boards it was tested with.  However, in this case
> it actually was pretty extensively tested with all the cards in
> question (including this one), and thus it was deemed safe to enable
> by default.  We've had cases in the past where developers exercised
> poor judgement and blindly turned on power management to make it work
> with one card, disregarding the possible breakage that could occur
> with other cards that use the same driver -- this was *not* one of
> those cases.
>
> If there is a bug, it should be pretty straightforward to fix provided
> it can be reproduced.
>
> Regarding the general assertion that the power management should be
> disabled by default, I disagree.  The power savings is considerable,
> the time to bring the tuner out of sleep is negligible, and it's
> generally good policy.
>
> Andy, do you have any actual details regarding the nature of the problem?
>
> Devin
>

I turned debug back on yesterday and it's been running since. No tuners 
have gone down yet, but here are some logs:
http://24.255.17.209:2400/vdr/logs/

When/if a tuner goes down again I'll put fresh logs up