[Clip+, Clip Zip, ClipV2, FuzeV2] Improve battery life, part 2

[saratoga]

We thought about 3 level power management for many years. There are ways it could be implemented, but it would be complex and the benefits may be small so I'm not sure how worthwhile it would be.

[Mihail Zenkov]

Maybe we could turn off USB and enable/disable it inside a menu.

We already shutdown USB when it not in use.

We thought about 3 level power management for many years. There are ways it could be implemented, but it would be complex and the benefits may be small so I'm not sure how worthwhile it would be.

You mean 'idle' state? AFAIK it rarely used and have little sense. Or I wrong?

[saratoga]

One way to do it would be to have codecs inform the playback engine of their estimated complexity (or have playback measure it). Than the boost and/or unboosted frequency could be changed depending on the codec being decoded. So FLAC might set a very low unboosted frequency or ape a higher boosted frequency.

[g.orlandini]

Hi Saratoga and Mikhail,
maybe we could have different frequency presets (normal and boost) that we can select from menu (after a rebooting if needed) so if we listen to files easy on CPU we can select from menu an appropriate set of normal and boost frequencies. For example preset could be 32-128, 38-192, 38-256 and so on...

[asymsucon]

Hey, sorry for the delay in my tests, had a bit of rough week.
Sandisk 128GB is still giving me 200+ reinits, even on basic playback and seeking with v.6
Sandisk 200GB - 1 reinit (tried IT, MOD and Opus)
Samsung 128GB - 1 reinit same tests

So it appears only the Sandisk 128GB is demanding.

[Mihail Zenkov]

asymsucon:
Try http://knk.square7.ch/cvdd2/rockbox-clip+-cvdd2_scaling-9.zip as it best what we have for today.

[asymsucon]

Had a kernel panic with v.9 yesterday:

[Mihail Zenkov]

asymsucon:
Bit strange as no big changes between v6 and v9. You have it only once or can reproduce?

[asymsucon]

Yes, only once so far. It happened during fast forwarding an Opus file.

[johnb]

Mihail, should I coninue testing clip+-cvdd2_scaling-9 or do you plan for any other changes soon?

[Mihail Zenkov]

I update links to v11. v11 same as v9 but based on fresh git.
If it working without big problems - I want know which minimum CVDD2 we can set for each player. To check that you should  extract sd card and play music from internal memory. Then step-by-step set lower CVDD2 in debug menu (don't change volume - it reset CVDD2). After each step switch to next track and check what you have in debug menu "SD retry stats". When you got "internal flash reinit" > 0 - check is internal memory freeze (you don't see files or can't paly it) or not (you can play next file but reinit rising as it was with sd cards).

I want know:
1. Name and variant of player.
2. On which value of CVDD2 you got reinit?
3. Is internal memory freeze on reinit or not?
4. With which value of CVDD2 you can play music for long time (> 1h) without reinit?

[johnb]

Just to confirm: the procedure/experiments you describe are WITHOUT  SDcard, i.e. we are testing the standalone player?

[Mihail Zenkov]

Just to confirm: the procedure/experiments you describe are WITHOUT  SDcard, i.e. we are testing the standalone player?

yes

[johnb]

On a clip+ variant 0:
 
Installing -11, shutdown, rebooting and then playing a  song I got a panic (pic 1), but this happened only once.

N.B.: sometimes the value of CVDD2 resets to 88, even if I never used the volume keys. So I checked back on the debug setting regularly.

I manage to go (step by step) down to 76. Stats stayed at 0,0,0,0. Also bookmark creation during shutdown worked. I have a long playlist running right now.

However, getting safely down to 76 is the tricky part. For instance, after the successful shutdown I had a hard time getting safely back to 76.
If you try several increments at a time, it can get stuck. Anything can happen from
not responsive at all,
WPS updating when skipping, but no playback
to crash with dc_write_callback (pic 2).


Once the stats values start to increase it almost never recovers.

What seems to work is: play song (and pause), decrease CVDD2  1 per 2sec, go back to WPS, play, skip ...

So far 75 has not worked for me.

I will report back on the playlist.

[Mihail Zenkov]

johnb:
Great result! I got only 87 on first my clip zip (variant 1) and 88 for second (also variant 1) on long playing.

If you try several increments at a time, it can get stuck.

Should be fixed in v12. I update links.