[pvrusb2] EPA Power Saving - HVR-1950 When Scanning EPG Data

[Mike Isely]

Roger:

One has *nothing* to do with the other.

On Sun, 1 Nov 2009, Roger wrote:

> Just curious as to whether we could expect (patched firmware?) which
> would fix the HVR-1950's 24/7 scanning for EPG data?

The firmware doesn't do that scan, the application has to do it, like 
MythTV.  The firmware only does what it is told by the driver (e.g. 
pvrusb2), which only does what it is told by the application (e.g. 
MythTV)...


> 
> >From what I understand, when tuners do scan for EPG data, they consume
> much more power then when actually in standby.

Actually, in this case I doubt it makes any difference.  The concept of 
"scanning for EPG data" does not exist in the device.  It's a function 
of the application, e.g. application just has a for-loop which 
successively tunes each known station, monitors it a bit to find the EPG 
data, then goes onto the next station.  That's all driven by the 
application.  Heck, the hardware doesn't even know what those 
frequencies are, since that's a function of the frequency table which 
only the application knows.


> 
> (There was a recent LCD TV performing this, which in turn, spurred the
> EPA to update it's docs/requisites for power saving.  The fix to this is
> to only scan for EPG data for a maximum count per day, instead of every
> second.)

Completely irrelevant for the pvrusb2 driver or anything it drives.

  -Mike


-- 

Mike Isely
isely @ isely (dot) net
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