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High contrast bug

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Hi,
it has been a long time since the last discussion about high contrast bug and here we are discussing it again .
This morning "Muh Hisyam Kamil" has sent me his dmesg log and I found that
Quote:

[ 8055.440820] 66D
[ 8055.590956] 66U
[ 8059.959035] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 100
[ 8059.959059] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 22
[ 8059.977964] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 99
[ 8059.977987] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 22
[ 8060.013459] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 98
[ 8060.013481] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 22
[ 8060.025496] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 95
[ 8060.025519] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 22
[ 8060.043586] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 91
[ 8060.043607] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 23
[ 8060.058801] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 88
[ 8060.058823] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 23
[ 8060.078772] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 85
[ 8060.078798] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 23
[ 8060.092008] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 81
[ 8060.092031] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 24
[ 8060.108827] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 78
[ 8060.108850] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 24
[ 8060.128235] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 75
[ 8060.128258] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 25
[ 8060.142150] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 71
[ 8060.142171] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 25
[ 8060.163874] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 68
[ 8060.163904] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 26
[ 8060.175561] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 65
[ 8060.175585] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 26
[ 8060.193389] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 61
[ 8060.193411] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 26
[ 8060.208609] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 58
[ 8060.208631] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 27
[ 8060.225783] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 55
[ 8060.225806] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 27
[ 8060.242260] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 51
[ 8060.242283] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 28
[ 8060.258772] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 48
[ 8060.258795] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 28
[ 8060.278017] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 45
[ 8060.278045] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 28
[ 8060.328830] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 41
[ 8060.328853] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 29
[ 8060.346277] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 38
[ 8060.346306] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 29
[ 8060.408776] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 37
[ 8060.408800] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 29
[ 8060.425322] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 33
[ 8060.425346] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 30
[ 8060.693047] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 24
[ 8060.693070] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 31
[ 8060.743916] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 23
[ 8060.743938] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 31
[ 8060.859006] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 21
[ 8060.859032] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 31
[ 8060.875243] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 19
[ 8060.875267] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 32
[ 8062.108925] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 20
[ 8062.108949] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 32
[ 8062.125551] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 24
[ 8062.125574] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 31
[ 8062.142152] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 27
[ 8062.142175] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 31
[ 8062.162943] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 30
[ 8062.162965] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 30
[ 8062.175797] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 34
[ 8062.175821] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 30
[ 8062.192087] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 37
[ 8062.192109] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 29
[ 8062.210260] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 40
[ 8062.210283] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 29
[ 8062.225554] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 44
[ 8062.225577] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 29
[ 8062.242007] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 47
[ 8062.242030] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 28
[ 8062.260576] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 50
[ 8062.260598] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 28
[ 8062.275670] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 54
[ 8062.275693] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 27
[ 8062.292031] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 57
[ 8062.292053] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 27
[ 8062.310856] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 60
[ 8062.310879] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 27
[ 8062.328084] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 64
[ 8062.328107] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 26
[ 8062.343660] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 67
[ 8062.343683] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 26
[ 8062.359139] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 70
[ 8062.359162] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 25
[ 8062.392392] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 72
[ 8062.392416] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 25
[ 8062.408633] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 73
[ 8062.408656] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 25

The screen brightness starts at so high density and gradually decreases to low value (from 100 to 73) and when I take kmsg log while I open my device i found that
Quote:

<4>[96652.836489] 116D
<4>[96652.976105] 116U
<4>[96653.221964] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 163
<4>[96653.453635] [BACKLIGHT] ktd253b_backlight_update_status ==> user_intensity : 163
<4>[96653.453648] [BACKLIGHT] ktd259b_backlight_update_status ==> tune_level : 16

so if look at the density values you would see a huge difference between the 2 devices. I assume that might be a kernel issue
I've created this thread so that all further discussions would be here and If there's something to test you guys post the results here .
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27th May 2017, 05:49 AM |#2  
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@LahKeda

Are you trying to fix that issue.
That contrast bug is very annoying.
1st June 2017, 06:56 PM |#3  
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On which ROM?
12th October 2017, 12:17 PM |#4  
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Hmm.. I could try to add an sysfs path so the user can set those values ...
12th October 2017, 04:04 PM |#5  
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where technology located
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Quote:
Originally Posted by psych.half

Hmm.. I could try to add an sysfs path so the user can set those values ...

it would be appreciated.
BTW, there's a guy messaged me on FB and said that he fixed the issue by using this app
https://play.google.com/store/apps/d...ara.wakelocker

tested this app in rom cm13
24th February 2018, 03:36 PM |#6  
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I dont think you guys still work on this device.....but still....
I've noticed that high contrast bug appears when the device goes into deepsleep and then is woken up by the user..... @LahKedathat app from that guy on FB works by not letting the device into deepsleep.....you already know this, don't you?.
26th February 2018, 02:48 AM |#7  
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Quote:
Originally Posted by Sansky12

I dont think you guys still work on this device.....but still....
I've noticed that high contrast bug appears when the device goes into deepsleep and then is woken up by the user..... @LahKedathat app from that guy on FB works by not letting the device into deepsleep.....you already know this, don't you?.

deepsleep is a feature where the cpu frequency would go to the lowest clock when the screen is off. if you disabled this, it'll drain your battery alot by still running at full frequency even if you're not using it.
2nd March 2018, 05:22 AM |#8  
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Quote:
Originally Posted by RJinxed

deepsleep is a feature where the cpu frequency would go to the lowest clock when the screen is off. if you disabled this, it'll drain your battery alot by still running at full frequency even if you're not using it.

Yup I know
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