I still own an HP iPAQ. Granted it's getting on a bit but I can do everything the Orange SPV M2000 (Blue Angel) can, except make phone calls. It was a great little device and one of the best things about it was the battery lasted ages.
Granted it doesn't have to keep polling the radio signal every few seconds but there is one way I think that battery performace could be improved and that's by making the screen less bright.
Right now I find the screen is way too bright at night. I play games and read on it in bed.
Is there any way of programatically making the brightness levels finer grained? WM5 has 10 graduations whereas the iPAQ has about 30.
Through this one change alone, I know I could get about another 2/4 hours usage out of my Blue Angel.
Anyone (Helmi?) know if this is possible by simply increasing the number of divisions in the brightness slider?
Isn't this just a change of a variable in the code or does the hardware fundamentally not allow it?
Looking though the registry there is a reg value for the brigtness levels at..
HKEY_CURRENT_USERS/ControlPanel/Backligh/
[ACBrightNess] and [BrightNess]
At default, the maximum value of the BrightNess settings can be 10, the lowest 1, with any other number higher or lower apparently turning off the brightness. You can adjust the scale of the brightness levels, so you can have 30 diffrent levels of controll by editing the [DefaultACBrightNess] and [DefaultBrightNess] values to 30, but this doesn't work too well on my device and value 1 is just as bright as it was before.
One extra little thing though, is that on the same registery folder is a value [QKeyLedTimeout] which controls the timeout of the blue lights behind the slide out keyboard, in seconds. I've set this to 30 which seems to be better then the mear 10 seconds you are normally given.
Thanks for that Percz
I'm going to download a registry editor from somewhere and give it a shot.
Did you work all this out by playing around with the registry?
I found in the same folder
HKEY_CURRENT_USERS/ControlPanel/Backligh/
the two keys MaxACBrightness and MaxBrightness. I set those to 30 and now I've got 30 graduations in the slider but only the first 10 work.
I guess there must be another two keys somewhere that set the actual low brightness and high brightness values.
I'll keep digging around and see if I can find something.
Well I have a HP Jornada 720 Handheld PC and it is 6 years old and still has the original battery in it and I find it lasts about 7 hours easy and I use it every week or so now but before I would be using for a couple of hours a day and it just keeps going a reset every few months but other than that it is fine. With the BA reset it 3 times a day, carry a extra battery just so it makes it through the day and then you still have other problems.
Related
how much diffrence between Auto backlight&manual in battery consuming
is there any experience ???
nobody knows?
One week ago, I changed the option for backlight to 5 min instead of normal 30sec. I even changed the backlight on while making calls (tweak cabfile). I don't notice any more batteryconsumption. This is a overall experience.
I think more brightness on the display will be more battery consuming than backlight settings.
neptunes50 said:
One week ago, I changed the option for backlight to 5 min instead of normal 30sec. I even changed the backlight on while making calls (tweak cabfile). I don't notice any more batteryconsumption. This is a overall experience.
I think more brightness on the display will be more battery consuming than backlight settings.
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Click to collapse
Thanks! I think you are right
What ever option you choose that cuts Electricity flow saves Batts.
So yes turning the screen all the way down when only doing calls and at night helps a lot!
Note also that the auto-dim function doesn't ever dim the light right down (no matter how dark it gets) - the lowest it reaches is equivalent to the manual brightness level 3.
Mathew
I have seen pretty many ROMs here, but am unable to make out which ROM is best optimized keeping battery life in mind. Could anyone please help suggest me a ROM or two that give the most of the battery life. Please.
You could take any ROM that will work with a kernel supporting OC/UV (like Setiron's) and use Xan's voltage app to limit the top speed of the CPU to something less than stock (1ghz is stock, your choices would be 800, 400, 200, 100)
Then apply an undervolt as low as you can go while still being stable.
This will of course result in a slower device, but that's the tradeoff. Less speed for more battery life.
Do note that the screen is the largest user of power by far and thus you can make the most difference by keeping the backlight as low as tolerable and shut it off whenever you aren't actively using it.
Da_G said:
You could take any ROM that will work with a kernel supporting OC/UV (like Setiron's) and use Xan's voltage app to limit the top speed of the CPU to something less than stock (1ghz is stock, your choices would be 800, 400, 200, 100)
Then apply an undervolt as low as you can go while still being stable.
This will of course result in a slower device, but that's the tradeoff. Less speed for more battery life.
Do note that the screen is the largest user of power by far and thus you can make the most difference by keeping the backlight as low as tolerable and shut it off whenever you aren't actively using it.
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Thanks Da_G. I did use SetCPU, and set the speed to 800, but for some reason it is giving me lower battery life compared to without SetCPU. So took it out.
Also, I have my screen brightness turned all the way down with auto set to off.
I meant to ask for a ROM that has all the battery hogging stuff in it removed/optimized.
I am currently like 45% left after about 8 hours with moderate usage. Trying to see if I can stretch more than this.
My today's usage statistics:
1. 11 hours 25 min 4 secs since unplugged
2. Battery remaining: 63%
3. Voice calls: 1h 10m 15s
4. Display: 1h 15m 42s
5. 2 gmail accounts with push turned on with about 10 mails delivered today
6. google voice with push all time with about 100-120 messages delivered using push
a. I do not have SetCPU.
b. I have my brightness set to 0, with auto-brightness turned off.
c. I used SamServMode to turn on EDGE, and 3G turned off since the phone was off charging hook. In short, on EDGE all the time.
d. Static but nice, colored wall paper.
Could anyone suggest me if this is good enough. And any ROM that could get me battery atleast on par with what I am getting.
A few of my ideas:
1. Use a dark colored theme. Our nice SUPER AMOLED screens don't use up much power to draw black - so the more black - the merrier.
2. Be careful of what extra apps running. Things like widget locker are one more app to run. Go slender. Theme's are okay if they replace files like frameworkres.apk but if they run in background (see it under processes) then that's bad.
3. Be extra careful of making sure you are fully charged when you flash. This means, charge, turn off, charge, turn on, charge, flash. I get a little more charge when I go back to eclair stock .
also note that 95% of battery is the screen
Everything else that was said before me was spot on so try that too.
fatttire said:
A few of my ideas:
1. Use a dark colored theme. Our nice SUPER AMOLED screens don't use up much power to draw black - so the more black - the merrier.
2. Be careful of what extra apps running. Things like widget locker are one more app to run. Go slender. Theme's are okay if they replace files like frameworkres.apk but if they run in background (see it under processes) then that's bad.
3. Be extra careful of making sure you are fully charged when you flash. This means, charge, turn off, charge, turn on, charge, flash. I get a little more charge when I go back to eclair stock .
also note that 95% of battery is the screen
Everything else that was said before me was spot on so try that too.
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Click to collapse
Thank you kind sir. I shall do this. But I am not flashing anymore.
I loaded the AOSP ROM from Spaceman here
Code:
http://forum.xda-developers.com/showthread.php?t=827153&page=36
and am getting pretty much the battery backup I was getting with stock.
Thanks a bunch everyone who helped me on this.
I got my replacement unit yesterday (screen lift on an 8GB model) and decided to check the white balance out of curiosity.
I used the Flashlight app from flash-the-brain, which offers a full range of brightness values, though without any numbers to go with them, so the actual brightness is only approximate. I used a Spyder 2 colorimeter (old and slow, but produced readings in line with a newer iDisplay I borrowed a while ago) and the monitor WB pre-calibration mode from my calibration software. Readings were taken where the measurement stabilised, and I generally waited around 30secs to be sure.
100%: 6305
90%: 6225
80%: 6187
70%: 6210
60%: 6235
50%: 6243
40%: 6252
30%: 6212
20%: 6034
10%: 6292
The dip at 20% was reproducible. Below 10% it was impossible to get a stable reading, probably because of light leakage along the glossy screen.
I've calibrated quite a few monitors over the years, and these numbers out-of-the-box are pretty damn good IMHO. But there's no guarantee this will have any relation to the white-balance on other displays.
[Note: For those who aren't into screen calibration, the numbers are all supposed to be 6500K. LCD screens typically vary from this number, in some cases by thousands of Kelvin]
Good data, what color did you use, white? Have you tried a few tones of grey to see how it handles the LCD color but consistent backlight? ie: Leave backlight at whatever is reasonable, 75%, higher? And adjust the background tone.
Not sure if that app will let you do that, but you could create a few png's and view them in JustPictures.
I just used a flashlight app with adjustable colour - the numbers on the left are approximate grey values. The actual backlight intensity remained the same throughout.
Guys, today i successfully got root and first of all slightly changed the values in sysmon.cfg. Changed maximum brightness level (255) from first value till next four values, so there`s first five values set on maximum brightness, 255. And then the brightness gradually goes lower and lower till minimum (100) value. I did the same thing on my previous phone, Xperia T, and had no issues with this. What do you think, everyting will be OK with Z ? I don`t play games so much , more often surfing, music, movies. But when the screen is changing brightnes this is so annoying, so i`ve changed this values, but a little bit worry, because the screen is bigger and quad-core processor, so what do you think ?
Well, i guess noone knows exactly answer on this question, and in the meantime i changed the values, and set first 10 values to maximum (255) brightness level, and have no issues with this. Instead i have maximum brightness level of the screen when surfing and listening the music, but in games the screen still makes darker, when the temperature of the phone becomes too high, and in this condition i think the screen is better to be a darker indeed, to not to let the phone become too hot and not to damage it. But in the normal state i think that the screen in maximum brightness won`t damage the device. I hope so
Loving the Mi 8, especially after the 10.1.1 update, however the "auto" brightness Useless. Virtually every time you unlock the phone in low(ish) light its reset to a very low setting. I've had phones from many manufacturers over the last few years and they all seem to have managed to string together a half decent auto-brightness offering.
Does anyone know of this is something they're working on?
I have the same issue
I love everything about the new update but that issue made me hate the update. Anyone with a fix? Appreciate it.
Not sure if the same brightness bug is impacting AOD too, which reacts to light levels but so aggressively at night that it actually turns off.
Auto Brightness on MIUI has always been dodgy as ****. There's workarounds - check out Velis auto brightness - but they're an additional battery drain since the app is constantly running.
I felt like it's not that bad on the MI 8 though.
Cheers
Just giving Lux Lite Dash a go and seems to be doing the trick. You can manually adjust when needed but then commit to memory for the next time a specific lux is reached. I guess over time, like most phones, it will then be customised how you like it.
Will see what battery life is like though...
So far so good. Battery seems to be at the same level with Lux Lite Dash running.
Lux Lite had issues in the end. The max brightness was lower than that of the phone. Switched to Velis which seems to have an option to allow the phones auto (and max brightness) to kick in when there's bright sunlight.