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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, 06:49 AM |#2  
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@LahKeda

Are you trying to fix that issue.
That contrast bug is very annoying.
1st June 2017, 07:56 PM |#3  
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On which ROM?
12th October 2017, 01:17 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, 05:04 PM |#5  
LahKeda's Avatar
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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
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