iPod Battery Custom Build (v16179) ?

[racekites]

Hi guys

I've been running an unsupported build (iPodVideo64-v16179-PCFv03) for a while now and have seen very good performance in terms of battery life.

I've just upgraded to the latest build only to see a significant drop off in battery life. I'm very tempted to go back to the old build that I have.

However, I wondered what has happened to this series of builds.. I've searched and can't find it anywhere... what happened ?

If not is there any documentation as to what the mods were ?

Cheers
A

[saratoga]

That patch was committed to SVN, and therefore became unnecessary. 

[MarcGuay]

http://svn.rockbox.org/viewvc.cgi?view=rev&revision=16259

[racekites]

thanks guys...

this mean its rolled into the current build ??

i noticed a significant difference in play times between the two releases..

Cheers
A

[Llorean]

Have you done matching battery benchmarks?

[LurkAzusa]

By default the accessories power is set to on.  Change it to off.  I believe that should save some battery power.

[soap]

By default the accessories power is set to on.  Change it to off.  I believe that should save some battery power.

Accessory power was (IIRC) still on when we did those test builds.  This should not be his issue, but a good power-savings tip nonetheless.

[ryran]

Sounds to me like it could have to do with the part of Andree's patch that wasn't committed -- setting idle cpu to 24MHz.
racekites: What format/bitrate are your tracks in?

[Buschel]

Hi,

everything mentioned before is correct. Nearly all changes were submitted in February, except:
1) turning off accessory power supply (can be done via settings menu now)
2) lower normal clock (will only give more playtime when using mpc and/or flac, you may use http://www.rockbox.org/tracker/task/8668?pagenum=4 to achieve the same effect).

best wishes from my off-time in black forest, germany!

[racekites]

Hi guys...

thank you for the responses...

I'm typically playing audiobooks and radioshows at 64kb/s. I usually get 14+ hours from a single charge with the battery mod build. With the latest build i was supprised to get less than 10 hours play back with the same bit rates.

I'll do a more scientific test to get actual times rather than estimated. If anyone wants a copy of this battery mod release to test too, i'll upload the copy i have.

Cheers
A

[Buschel]

Hello racekites,

I've checked the pcf-03 patch against current svn. Accessory power supply (mentioned above) was definately switched off in pcf-03-builds. You should also deactivate this via menu with current builds.

Two more questions:

1. Can you use a svn-build, go into the debug menu "View PCF registers" and check the value of LPREGC1?
2. Can you use the pcf-03 build, go into the debug menu "Debug audio thread" and check the "boost ratio" when playing one of your typical tracks for some minutes?