On 4/14/2010 10:40 AM, Devin Heitmueller wrote:
On Wed, Apr 14, 2010 at 1:29 PM, Timothy D. Lenz<tlenz@xxxxxxxxxx> 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
This morning a tuner was down. So the long runs it made, maybe where a
fluke. I still have options xc5000 no_poweroff=1 debug=1. I posted new
logs, to http://24.255.17.209:2400/vdr/logs/. The files with ".new" ext
are the new ones with lognig when the tuner went down.
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