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HomeClockworkMod (CWM) Recovery easy install for RK3066 and RK3188 -- TWRP/CWM Flash-Tool and root for RK3288
 Please donate to support OMA and CrewRKTablets firmware work, thank you !
2013/10/16
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Hi guys!
Sorry for my bad english 
I installed 1.3.3 version on my GoClever R83.2 (Mediacom 875S2) and brightness adjustment not worked for me because system trying to write brightness level toÂ
/sys/class/backlight/rk28_bl/brightness
istead of
/sys/class/backlight/rk30_bl/brightness
I have mounted system.img to my file system and using grep I found this path using in compiled library /system/lib/hw/lights.rk30board.so
Then using HEX editor I replace only two bytes (in text: 28 -> 30) and IT WORKS!!!
Now I have not time to build patch, but may be one of you can do it?
Download and replace your lights.rk30board.so
OR
Flash your device used patched system.img (1.3.3 Oma's image. only this lib replaced)
ACHTUNG!!! Don't forget: you must set permissions to this file!
it possible from terminal or via adb: chmod 777Â /sys/class/backlight/rk30_bl/brightness
Enjoy!
Tomorrom I will try to build patch for using via CWM
The following users say thank you to uncoder for this useful post:
Alucard1989pl, admin, Oma7144
Moderator
Firmware Guru
2012/10/06
Online
Cool. Well done!
I can do a CWM fix if you are ok with that?
- Oma -
Per aspera ad astra, we rock the Tablets !
If you like our firmwares, please consider making a donation to support our work.
Thank you!
2013/07/02
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That will sounds so gay but ... I LOVE YOU uncoder! 
. This fix works on my GoClever R974.2 ^^. I can't wait for cwm package by Oma7144 .
admin
2010/09/11
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Great find uncoder.
Just thinking about another way to fix the problem without patching files, would it also work by making a symlink from /sys/class/backlight/rk28_bl/brightness to /sys/class/backlight/rk30_bl/brightness  ?
Cheers.
If you like our web site, applications and firmwares, feel free to support our site. Donations are used to pay the bills for our server hosting costs, development tools and purchase new tablets to support.
2013/10/16
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Oma, of course!
Alucard, Thanks
2013/10/16
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admin, I don't know how to write to realtime sysfs /sys partition 
I cant' create any files/folders here. only chown.
And it is my first ROMÂ reverse engineering experience
P.S. if it possible do with patching script - it would be great!
2013/07/02
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@uncoder i find some problem after changing permissions. After every restart my device i must change this permission again. It's possible to set this permissions permanently or i must extract boot.img and change the permission in ramdisk?.
2013/10/16
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@Alucard
hm.. I have not restarted device If you can change permissions in boot.img may be you can create symlink mentioned by admin? And then my hack would not be needed
I will try do this, but tomorrowÂ
2013/07/02
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@up i'll try fix permissions in boot.img ramdisk tonight. I hope it will work 
.
2013/10/16
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first try create symlink from /sys/class/backlight/rk28_bl/brightness to /sys/class/backlight/rk30_bl/brightness in boot.img - It would be better solution than hacking proprietary library
2013/07/02
Offline
@up in init.rk30board.rc i found this line:
"#backlight
   chown system system /sys/class/backlight/rk28_bl/brightness"
 so i'll try change it to:
 #backlight
   chmod 0777 /sys/class/backlight/rk30_bl/brightness"
 -------------------------------------------
F**k yeah! I fixed the permissions. Now it works perfectly on every boot . Now boot.img must me flashed with RKAndroidTool v1.35.
Firmware Guru
2013/06/11
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I hope I fixed it right the brightness:
Can anyone please test it?
netlars
Per aspera ad astra, we rock the Tablets !
 If you like our firmwares, please consider making a donation to support our work.
Thank you!
Moderator
Firmware Guru
2012/10/06
Online
boot.img: http://crewrktablets.arctablet.com/?wpfb_dl=1227
patched lib: http://crewrktablets.arctablet.com/?wpfb_dl=1238
Both way will work, won't they?
- Oma -
Per aspera ad astra, we rock the Tablets !
If you like our firmwares, please consider making a donation to support our work.
Thank you!
Moderator
Firmware Guru
2012/10/06
Online
May I ask for feedback?
- Oma -
Per aspera ad astra, we rock the Tablets !
If you like our firmwares, please consider making a donation to support our work.
Thank you!
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