- Status Closed
- Percent Complete
- Task Type Patches
- Category Operating System/Drivers
- Assigned To No-one
- Operating System Another
- Severity Low
- Priority Very Low
- Reported Version Daily build (which?)
- Due in Version Undecided
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Due Date
Undecided
- Votes
- Private
Attached to Project: Rockbox
Opened by prof_wolfff - 2012-01-08
Last edited by saratoga - 2012-04-11
Opened by prof_wolfff - 2012-01-08
Last edited by saratoga - 2012-04-11
FS#12521 - iPod Classic/6G: cpu freq scaling
This patch implements HAVE_ADJUSTABLE_CPU_FREQ capability, CPU and bus frequency is divided by 2 and core voltage is decreased from 1.2 to 1.1V when unboosted.
Tthe previous ipod6g_holdswitch_poll patch must be applied before, otherwise the system is very unstable.
ID | Project | Summary | Priority | Severity | Assigned To | Progress | |
---|---|---|---|---|---|---|---|
12520 | Rockbox | Very Low | Low |
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Tested this together with
FS#12520and it seems to be working fine on my 120GB classicI am testing a more aggressive configuration: CPU: 54MHz, bus: 108MHz, Vcore: 1.050 V., it seems stable but need to test it a bit more, i will try to post it as soon as possible.
Works very well for me too, I’ve been using it for weeks on two Classics (80GB and 120GB). In addition to #12520, I have applied also #12523 and I get noticeably longer battery life while the player is very stable. Good job!
Thanks! v1 patch seems very stable, the new v2 patch i am posting sets CPU=54MHz, buses=54/54MHz (not sure, it could be 108/54) and Vcore=1.050V, it increases battery life about 15-20% (vs cpu-freq-v1 patch).
Battery life could be similar to OF when using this patch in conjunction with lcd_sleep-v2 patch (#12523), one tester reported battery bench lasted for 36h45m on a new 160Gb iPod, OF reached about 38 hours under similar conditions: one continuous run, autorepeat folder (70min. mp3@320), headphones inserted, volumen=-35dB, no EQ/effects, holdswitch on. I wonder if CPU voltage could be decreased one or two more steps…
I’ve been running v2 of this patch (plus charger v1 and holdswitch-poll v1) for a day or so on my skinny 160GB, and the results are excellent so far.