[mythtv-users] Where does the remote lag come from?

Robert Denham rjadenham at gmail.com
Tue Sep 18 05:25:30 UTC 2007

On Tue, 18 Sep 2007 10:08:32 am Rick wrote:
There is a card popular in Australia which has had problems with the remote.   
It is a leadtek dtv1000, and some people managed to get it to work with 
mythtv, but many people found that it was quite unresponsive, while others 
found it worked fine.  It turned out it was due to differences in polling in 
the kernel.  From the thread where it was discussed 
(http://forums.whirlpool.net.au/forum-replies.cfm?t=566843&p=3), a user wrote 

The kernel driver polls the card for IR keypresses, using a 1 ms timer. 
Unfortunately, the default Fedora (and others presumably) kernel 
configuration uses a jiffies tick of 250 Hz (4ms) so the card doesn't get 
polled often enough, and some keypresses are missed. This explains why some 
distro's can get this card working and others can't with the same patches.

Maybe your problem is similar to this?


> Hi Mike,
> Nothing has really changed in the orientation of the IR receiver... it
> kinda hangs down from the top of the entertainment unit.  The blaster
> portion is hidden from influence.  One thing that did occur to me to
> check was the batteries in the remote and they were good.
> I'll check on some of the other things you suggested in the next day or
> so.  I'll also dig out the other receiver and try that one in place of
> the one I've been using.  I will say that a buddy of mine is also
> experiencing the exact same thing with his similar setup. He is running
> the same version of Mandriva as I, however, my kernel and his are
> slightly different versions.

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