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 -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
