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author | Andree Buschmann <AndreeBuschmann@t-online.de> | 2010-03-29 17:58:17 +0000 |
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committer | Andree Buschmann <AndreeBuschmann@t-online.de> | 2010-03-29 17:58:17 +0000 |
commit | 10023adf727391cd165be7b5290e83a4710d0129 (patch) | |
tree | 20f141c4b87be108bfe09fbdfb84b8be910f24af | |
parent | dedf08a6e15daa676176221cea19b0ab0e93df12 (diff) | |
download | rockbox-10023adf727391cd165be7b5290e83a4710d0129.tar.gz rockbox-10023adf727391cd165be7b5290e83a4710d0129.zip |
Add new section 'Optimising battery runtime' to the manual (FS#11148).
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25382 a1c6a512-1295-4272-9138-f99709370657
-rw-r--r-- | manual/advanced_topics/main.tex | 95 | ||||
-rw-r--r-- | manual/configure_rockbox/display_options.tex | 4 | ||||
-rw-r--r-- | manual/configure_rockbox/playback_options.tex | 4 | ||||
-rw-r--r-- | manual/configure_rockbox/system_options.tex | 4 |
4 files changed, 101 insertions, 6 deletions
diff --git a/manual/advanced_topics/main.tex b/manual/advanced_topics/main.tex index 47d4305f72..b13a76712b 100644 --- a/manual/advanced_topics/main.tex +++ b/manual/advanced_topics/main.tex | |||
@@ -580,3 +580,98 @@ current version. | |||
580 | 580 | ||
581 | \opt{archos}{\input{advanced_topics/archos-flashing.tex}} | 581 | \opt{archos}{\input{advanced_topics/archos-flashing.tex}} |
582 | 582 | ||
583 | \section{Optimising battery runtime} | ||
584 | Rockbox offers a lot of settings that have high impact on the battery runtime | ||
585 | of your \dap{}. The largest power savings can be achieved through disabling | ||
586 | unneeded hardware components -- for some of those there are settings | ||
587 | available. | ||
588 | \opt{swcodec}{ | ||
589 | Another area of savings is avoiding or reducing CPU boosting | ||
590 | through disabling computing intense features (e.g. sound processing) or | ||
591 | using effective audio codecs. | ||
592 | } The following provides a short overview of the most relevant settings and | ||
593 | rules of thumb. | ||
594 | |||
595 | \nopt{ondio}{ | ||
596 | \subsection{Display backlight} | ||
597 | The active backlight consumes a lot of power. Therefore choose a setting that | ||
598 | disables the backlight after timeout (for setting \setting{Backlight} see | ||
599 | \reference{ref:Displayoptions}). Avoid to have the backlight enabled all the | ||
600 | time. | ||
601 | } | ||
602 | |||
603 | \opt{lcd_sleep}{ | ||
604 | \subsection{Display power-off} | ||
605 | Shutting down the display and the display controller saves a reasonable amount | ||
606 | of power. Choose a setting that will put the display to sleep after timeout | ||
607 | (for setting \setting{Sleep} see \reference{ref:Displayoptions}). Avoid to | ||
608 | have the display enabled all the time -- even, if the display is transflective | ||
609 | and is readable without backlight. Depending on your \dap{} it might be | ||
610 | significantly more efficient to re-enable the display and its backlight for a | ||
611 | glimpse a few times per hour than to keep the display enabled. | ||
612 | } | ||
613 | |||
614 | \opt{accessory_supply}{ | ||
615 | \subsection{Accessory power supply} | ||
616 | As default your \dap{}'s accessory power supply is always enabled to ensure | ||
617 | proper function of connected accessory devices. Disable this power supply, if | ||
618 | -- or as long as -- you do not use any accessory device with your \dap{} while | ||
619 | running Rockbox (see \reference{ref:AccessoryPowerSupply}). | ||
620 | } | ||
621 | |||
622 | \opt{lineout_poweroff}{ | ||
623 | \subsection{Line Out} | ||
624 | Rockbox allows to switch off the line-out on your \dap{}. If you do not need | ||
625 | the line-out, switch it off (see \reference{ref:LineoutOnOff}). | ||
626 | } | ||
627 | |||
628 | \opt{spdif_power}{ | ||
629 | \subsection{Optical Output} | ||
630 | Rockbox allows to switch off the S/PDIF output on your \dap{}. If you do not | ||
631 | need this output, switch it off (see \reference{ref:SPDIF_OnOff}). | ||
632 | } | ||
633 | |||
634 | \opt{disk_storage}{ | ||
635 | \subsection{Anti-Skip Buffer} | ||
636 | Having a large anti-skip buffer tends to use more power, and may reduce your | ||
637 | battery life. It is recommended to always use the lowest possible setting | ||
638 | that allows correct and continuous playback (see \reference{ref:AntiSkipBuf}). | ||
639 | } | ||
640 | |||
641 | \opt{swcodec,disk_storage,flash_storage}{ | ||
642 | \subsection{Audio format and bitrate} | ||
643 | \opt{swcodec}{ | ||
644 | In general the fastest decoding audio format will be the best in terms of | ||
645 | battery runtime on your \dap{}. An overview of different codec's performance | ||
646 | on different \dap{}s can be found at \wikilink{CodecPerformanceComparison}. | ||
647 | } | ||
648 | |||
649 | \opt{flash_storage}{ | ||
650 | Your target uses flash that consumes a certain amount of power during access. | ||
651 | The less often the flash needs to be switched on for buffering and the shorter | ||
652 | the buffering duration is, the lower is the overall power consumption. | ||
653 | Therefore the bitrate of the audio files does have an impact on the battery | ||
654 | runtime as well. Lower bitrate audio files will result in longer battery | ||
655 | runtime. | ||
656 | } | ||
657 | \opt{disk_storage}{ | ||
658 | Your target uses a hard disk which consumes a large amount of power while | ||
659 | spinning -- up to several hundred mA. The less often the hard disk needs to | ||
660 | spin up for buffering and the shorter the buffering duration is, the lower is | ||
661 | the power consumption. Therefore the bitrate of the audio files does have an | ||
662 | impact on the battery runtime as well. Lower bitrate audio files will result | ||
663 | in longer battery runtime. | ||
664 | } | ||
665 | |||
666 | Please do not re-encode any existing audio files from one lossy format to | ||
667 | another based upon the above mentioned. This will reduce the audio quality. | ||
668 | If you have the choice, select the best suiting codec when encoding the | ||
669 | original source material. | ||
670 | } | ||
671 | |||
672 | \opt{swcodec}{ | ||
673 | \subsection{Sound settings} | ||
674 | In general all kinds of sound processing will need more CPU time and therefore | ||
675 | consume more power. The less sound processing you use, the better it is for | ||
676 | the battery runtime (for options see \reference{ref:configure_rockbox_sound}). | ||
677 | } | ||
diff --git a/manual/configure_rockbox/display_options.tex b/manual/configure_rockbox/display_options.tex index f416e8418e..23673e2482 100644 --- a/manual/configure_rockbox/display_options.tex +++ b/manual/configure_rockbox/display_options.tex | |||
@@ -60,8 +60,8 @@ | |||
60 | \item[Sleep (After Backlight Off).] | 60 | \item[Sleep (After Backlight Off).] |
61 | This setting controls how long rockbox will wait before turning off the | 61 | This setting controls how long rockbox will wait before turning off the |
62 | display after the backlight is turned off. Turning off the display | 62 | display after the backlight is turned off. Turning off the display |
63 | saves a little bit of battery power but turning on the display takes | 63 | saves battery power but turning on the display takes noticeably longer |
64 | noticeably longer than just turning on the backlight. | 64 | than just turning on the backlight. |
65 | } | 65 | } |
66 | 66 | ||
67 | \opt{backlight_brightness}{ | 67 | \opt{backlight_brightness}{ |
diff --git a/manual/configure_rockbox/playback_options.tex b/manual/configure_rockbox/playback_options.tex index 8ac9548eaf..5f61b0b0e2 100644 --- a/manual/configure_rockbox/playback_options.tex +++ b/manual/configure_rockbox/playback_options.tex | |||
@@ -62,7 +62,7 @@ you to configure settings related to audio playback. | |||
62 | The setting \setting{FF/RW Min Step} controls the initial speed and \setting{FF/RW Accel} controls the acceleration. | 62 | The setting \setting{FF/RW Min Step} controls the initial speed and \setting{FF/RW Accel} controls the acceleration. |
63 | 63 | ||
64 | \opt{disk_storage}{ | 64 | \opt{disk_storage}{ |
65 | \section{Anti-Skip Buffer} | 65 | \section{\label{ref:AntiSkipBuf}Anti-Skip Buffer} |
66 | This setting controls how early Rockbox starts refilling the music buffer | 66 | This setting controls how early Rockbox starts refilling the music buffer |
67 | from the hard drive when playing. A longer Anti-Skip Buffer helps prevent | 67 | from the hard drive when playing. A longer Anti-Skip Buffer helps prevent |
68 | skips in music playback if Rockbox has trouble reading from the disk. | 68 | skips in music playback if Rockbox has trouble reading from the disk. |
@@ -204,7 +204,7 @@ you to configure settings related to audio playback. | |||
204 | }%\opt{swcodec} | 204 | }%\opt{swcodec} |
205 | 205 | ||
206 | \opt{spdif_power}{ | 206 | \opt{spdif_power}{ |
207 | \section{Optical Output} | 207 | \section{\label{ref:SPDIF_OnOff}Optical Output} |
208 | Enables or disables the optical S/PDIF output to | 208 | Enables or disables the optical S/PDIF output to |
209 | allow a digital connection to a suitable external decoder. To enable | 209 | allow a digital connection to a suitable external decoder. To enable |
210 | optical output, set to \setting{Yes} | 210 | optical output, set to \setting{Yes} |
diff --git a/manual/configure_rockbox/system_options.tex b/manual/configure_rockbox/system_options.tex index d2eb992b89..af7695ed48 100644 --- a/manual/configure_rockbox/system_options.tex +++ b/manual/configure_rockbox/system_options.tex | |||
@@ -152,7 +152,7 @@ This sub menu relates to limits in the Rockbox operating system. | |||
152 | } | 152 | } |
153 | 153 | ||
154 | \opt{accessory_supply}{ | 154 | \opt{accessory_supply}{ |
155 | \subsection{Accessory Power Supply} | 155 | \subsection{\label{ref:AccessoryPowerSupply}Accessory Power Supply} |
156 | This option turns the accessory power supply \setting{On} and \setting{Off}. | 156 | This option turns the accessory power supply \setting{On} and \setting{Off}. |
157 | The Apple accessory protocol has been partially implemented in Rockbox, and | 157 | The Apple accessory protocol has been partially implemented in Rockbox, and |
158 | thus there is a reasonable chance that your favourite accessory will work. | 158 | thus there is a reasonable chance that your favourite accessory will work. |
@@ -162,7 +162,7 @@ this option \setting{On}. If it is not required, then turning this setting | |||
162 | } | 162 | } |
163 | 163 | ||
164 | \opt{lineout_poweroff}{ | 164 | \opt{lineout_poweroff}{ |
165 | \subsection{Line Out} | 165 | \subsection{\label{ref:LineoutOnOff}Line Out} |
166 | This option turns the \dap{}'s line-out \setting{On} and \setting{Off}. On some | 166 | This option turns the \dap{}'s line-out \setting{On} and \setting{Off}. On some |
167 | devices an enabled line-out will consume some power even if not used. If it is | 167 | devices an enabled line-out will consume some power even if not used. If it is |
168 | not required, then turning this setting \setting{Off} will save battery and | 168 | not required, then turning this setting \setting{Off} will save battery and |