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HOWTO: Reduce screen resolution, preserve battery life enhance framrate

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By Rotkaeqpchen, Senior Member on 1st December 2016, 10:59 AM
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I thought it would be good to have this in one seperate thread. The PRIV has a great qHD display but I don't think qHD resolutions make any sense on mobile devices. Problems like framedrops, low framerates, heat and battery draining can be the result.

Luckily, although the PRIV is unrootable, the commands wm density and wm size still work when applied through adb shell with USB debugging turned on. (If you don't know how to do this, there are many tutorials out there).

The PRIV has a native resolution of 2560x1440 @ 560ppi. We will change this to 1920x1080 @ 420ppi. To do so enter the following two lines:
Code:
adb shell wm size 1080y1920
adb shell wm density 420
Then reboot your device manually or simply enter:
Code:
adb reboot
To reset everything to normal enter:
Code:
adb shell wm size reset
adb shell wm density reset
Then reboot.

Hope this is helpful to you. Now I really like my PRIV and get stellar battery life and SoT:
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2nd December 2016, 09:53 AM |#2  
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WORKING ! thank You for that
2nd December 2016, 10:52 PM |#3  
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After applying and rebooting, only a third of the screen was filled by the UI in the center and was very small. The rest was blank, not even navigation displayed.

Tried on the Priv bought from Blackberry direct on the latest update.
4th December 2016, 04:29 PM |#4  
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Quote:
Originally Posted by Calnyx

After applying and rebooting, only a third of the screen was filled by the UI in the center and was very small. The rest was blank, not even navigation displayed.

Tried on the Priv bought from Blackberry direct on the latest update.

Worked for me.
did execute these commands in this order on my computer with adb:

adb shell wm size 1920x1080
adb shell wm density 420
adb reboot

Done.
5th December 2016, 04:49 PM |#5  
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its wrong because to put it correct should be

adb shell wm size 1080x1920 ( not 1920x1080 )

5th December 2016, 10:24 PM |#6  
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Been at 1080p for the past couple of months and haven't had any issues

Used this: http://forum.xda-developers.com/note...-root-t3217199

Sent from my STV100-3 using XDA-Developers mobile app
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8th December 2016, 12:18 AM |#7  
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Working
Nice, great man
17th December 2016, 06:57 AM |#8  
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Quote:
Originally Posted by Rotkaeqpchen

...
The PRIV has a native resolution of 2560x1440 @ 560ppi. We will change this to 1920x1080 @ 420ppi. To do so enter the following two lines:

Code:
adb shell wm size 1920x1080
adb shell wm density 420
...

Setting a higher density enlarges the fonts for better readability (which might be important for people in their 40ies ). I experienced setting values 450 or 480 is still OK. Higher values hide some things from the productivity bar.
Unfortunately, picture password is not working any more.

It seems that the display needs about 150 mAh per hour with the reduced resolution. Can someone check the initial energy consumtion to quantify the gain (if any).

Thanks
19th December 2016, 12:48 PM |#9  
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Here is a screenshot of the current energy consumption.

I will try out the commands later.
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19th December 2016, 06:34 PM |#10  
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For comparison:
Time on: 2h 4m 25s
Computed power use: 436 mAh
With default resolution.
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25th December 2016, 06:05 AM |#11  
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Anyone know how to correct the corrupt BBM icon in the HUB after the resolution/DPI change? The BBM icon turns huge on any density change and it looks incredibly ugly.
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