From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121]:61284 "EHLO cdptpa-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752773AbZJ2NiE (ORCPT ); Thu, 29 Oct 2009 09:38:04 -0400 Message-ID: <4AE99ABE.1000007@acm.org> Date: Thu, 29 Oct 2009 06:38:06 -0700 From: Bob Cunningham MIME-Version: 1.0 To: Devin Heitmueller CC: linux-media@vger.kernel.org Subject: Re: HVR-950Q problem under MythTV References: <4AE8F99E.5010701@acm.org> <829197380910282040t6fce747aoca318911e76aa23f@mail.gmail.com> <4AE91E54.2030409@acm.org> <829197380910282156l6bea177g79f38eb973335e27@mail.gmail.com> <4AE92913.4050209@acm.org> <829197380910290559u78b05d89x9342f440d2067be5@mail.gmail.com> In-Reply-To: <829197380910290559u78b05d89x9342f440d2067be5@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: On 10/29/2009 05:59 AM, Devin Heitmueller wrote: > On Thu, Oct 29, 2009 at 1:33 AM, Bob Cunningham wrote: >> I spoke too soon: Switching between SD and HD channels (or vice-versa) >> always works the first time, but generally dies the next time I try. The >> behavior is very inconsistent: If I switch from SD to HD 720p or higher, >> the tuner goes away the next time I try to tune an SD channel. If I switch >> between SD and 480i HD channels, I can do so up to 4 times before it stops >> working. >> >> I can switch among SD channels with no problem, and I can switch between HD >> channels of any resolution with no problem. Only switching back and forth >> between HD and SD causes the problem, and it always happens, sooner or >> later. >> >> Is there a way to force a "quick& dirty" device reinitialization? Right >> now, I'm killing mythfrontend and mythbackend, re-plugging the HVR-950Q, and >> restarting mythbackend and mythfrontend. Probably overkill. Is there an >> easier way? > > In this context, we are not talking about SD versus HD - we're talking > about analog versus digital. You should have no trouble switching > between SD ATSC channels and HD ATSC channels (since the hardware > literally cannot tell the difference). However, it's not *too* > surprising to find issues going back and forth between analog and > digital. If I wait at least 30 seconds between changing channels, the lockups rarely occur. I'm wondering if this may be a MythTV issue related to buffering, rather than an HVR-950Q issue. I rarely watch LiveTV, and I'm using it now only to validate all my channels against the EPG content (correct XMLID), after which this shouldn't be a problem. > Are you sure you put both the analog and digtial video sources into > the same recording group? If not, it's possible that MythTV will > attempt to use both the analog and digtial parts of the card at the > same time, which is not permitted by the hardware. They are in the same group, and the digital side is opened "only when needed" (no EIT scan unless tuned). > Devin -BobC