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[Clip+] Power consumption issues with 3.11.2

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Tigran Ghardashyan:
Ok, this problem is not 3.11.2 issue, it's not even a RockBox issue I think.
Turns out that some memory cards consume much more energy than others. I got 16+ hours of playback from internal memory/ my 2 GB Verbatim and 4 GB SanDisk memory cards. But I get ~11 hours of work from mentioned 32 GB SanDisk card. I have upgraded to this card after 3.11.2 release, that's why I thought it's RB issue.  :)
P.S. It seems that track changing background noise ( described here - http://www.rockbox.org/tracker/task/11907 ) loudness is proportional to memory card's power consumption amount.
Thanks,
Best regards.

saratoga:

--- Quote from: Tigran Ghardashyan on May 08, 2012, 04:00:25 AM ---Turns out that some memory cards consume much more energy than others. I got 16+ hours of playback from internal memory/ my 2 GB Verbatim and 4 GB SanDisk memory cards. But I get ~11 hours of work from mentioned 32 GB SanDisk card.

--- End quote ---

Interesting.  Using my 16 GB card, battery life decreased by just a few minutes verses having no SD card on the Clip+. 

Tigran Ghardashyan:

--- Quote from: saratoga on May 08, 2012, 04:07:12 AM ---
Interesting.  Using my 16 GB card, battery life decreased by just a few minutes verses having no SD card on the Clip+. 

--- End quote ---

What I've found on ABI forums http://www.anythingbutipod.com/forum/showthread.php?t=61904

bertrik:
I remember reading that some cards put themselves in a kind of low-power mode after some time of SD bus inactivity.
It is very possible that not every card supports this, or supports this to the same extent.
Different sd cards even from the same manufacturer can differ in this behaviour.

It  could also be possible that we unknowingly do something in rockbox that prevents the card from entering the low-power mode, like not sending enough idle cycles after a command. Or perhaps something like the card not entering low-power mode when we issue a read-multiple command and not terminating the multi-read.

This is pure speculation so far, I think you should try to see if you get a runtime reduction too when using the original firmware to be sure.

Astrogoth:

--- Quote from: Tigran Ghardashyan on May 08, 2012, 04:00:25 AM ---Ok, this problem is not 3.11.2 issue, it's not even a RockBox issue I think.
Turns out that some memory cards consume much more energy than others. I got 16+ hours of playback from internal memory/ my 2 GB Verbatim and 4 GB SanDisk memory cards. But I get ~11 hours of work from mentioned 32 GB SanDisk card. I have upgraded to this card after 3.11.2 release, that's why I thought it's RB issue.  :)
P.S. It seems that track changing background noise ( described here - http://www.rockbox.org/tracker/task/11907 ) loudness is proportional to memory card's power consumption amount.
Thanks,
Best regards.

--- End quote ---

My 32GB Sandisk does the same. My old 4GB generic card went hours longer.

Glad you mentioned it, I thought I had a lemon.

 

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