[mythtv-users] Re: Tearing in playback

[Tom Hughes]

In message <A4164F60-60AD-11D9-99CC-000393CDF554 at cse.unsw.edu.au>
        William Uther <willu.mailingLists at cse.unsw.edu.au> wrote:

> On 07/01/2005, at 9:51 PM, Tom Hughes wrote:
>
>> If you're root then that seems odd. The only things I would have
>> thought likely to do that are the permissions on /dev/rtc which
>> should be irrelevant as root can open any file. The other thing
>> would be the dev.rtc.max-user-freq kernel configuration value but
>> that only limits non-root users.
>>
>> Maybe your kernel (or your hardware) has some hard limit on the
>> setting of the RTC frequency?
>
> I guess I lied slightly. :)  I'm running the front end setuid root.
> Maybe the front end is dropping root privs in the relevant thread
> before trying to do what it is doing?  Hmm, /dev/rtc is rw by group
> audio, and user mythtv is in that group.

That sounds likely. I'd try checking the other setting with:

  sysctl dev.rtc.max-user-freq

If it is less than 1024 then that is probably the problem. You
can increase it with:

  sysctl -w dev.rtc.max-user-freq=1024

and add it to /etc/sysctl.conf to make it permanent.

Tom

-- 
Tom Hughes (tom at compton.nu)
http://www.compton.nu/