[Q] [CM9][ICS] Help! Touchscreen issue, Kernel irrelevant - Galaxy S II Q&A, Help & Troubleshooting

1st Post: Current status(Top), Problem (End)
2nd Post: Fix (doesn't work in the newest Build)
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The Problem is back with the new 02202012 Build:
kevuin said:
kevuin said:
Oddly enough the Problem with a unresponsive area on the touchscreen is back with this new build, even when I change the Touchscreen Sensitiveness in the new Setting menu. No matter which value (yes, even 10 which had worked before), the problem was there.
Even the old way through Terminal Emulator doesn't work anymore, i guess something has been changed there.
Help !
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codeworkx said:
are you sure it's no hardware defect? mud or water on the display?
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That's what I had thought at the beginning too, but it went away when i flashed Stock and also when I set it the sensitivity manually with Terminal Emulator (as written here)
It's unlikely that it's just a loose contact (a.k.a. Wackelkontakt) and that it only worked when I used the Fix/stock rom..
did you change anything else in the last build that could've affected this ?
Thanks for everything BTW !
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codeworkx said:
we just added the sgs2 settings which allows to do the same you've done via terminal emulator.
does it only happen if charger/usb cable is connected? could be a broken cable.
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kevuin said:
That's what I thought, i just tried 'cause you never know
It's definately not because of the charger (i know the problem with some certain inofficial charger where the touchscreen stops working when plugged in. but thats not it)
It's there all the time :/ I'd guess it's because of something else you might've changed in this build then.. any other ideas ?
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The Problem itself + everything already discussed:
After I didn't get any more help in the General Discussion Thread, I had no choice than opening another.
Here my problem and help so far:
kevuin said:
Hey Guys,
after i found some lag/problems with my touchscreen (like no response at all) sometimes, and it always helps/goes away when i turn my screen off and then back on again.
But now (idk if it's because of this build, or my hardware) i have a whole horizontal stripe not getting any information about where my fingers are at any time. That "dead" area starts after the first few pixels from the bottom (where the homebutton etc. is) and is about 1cm wide (direction top), reaching from left to right of the screen.
It's about the whole "Slide to Unlock" area on iPhones.
I thought it was a Hardware problem of mine.. so i got rid of my yellow triangle, flashed some old Stock backup i had laying around and i noticed that the problem was totally gone! next to some laggyness everywhere the area i described was acting normal !
After that i went back to CM9 and the problem is back =/
Any ideas what i can do about it or what this is caused by ?
Thanks alot !
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mudferret said:
^ re touch screen, its because of the lpb kernel; install lp6 kernel (cm9 one, not Chainfire)
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kevuin said:
i just flashed the kernel and oddly enough the problem is still there ! =S
now what ?
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Additionally to all of this, I managed that my phone worked normal again (on the 02172012 Build) after I deleted the market and reinstalled from some forum because it didn't work at all.
But the touchscreen problem was back after I rebooted and wiped all caches right after.
I wasn't able to replicate this fix ever since..
so now I know it's not a hardware problem (or maybe a loose contact? ..unlikely)
Picture:
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Any ideas what I can do about this ?
Any help and Ideas are welcome !

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Sadly enough, this fix doesn't help anymore in the latest build
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Thanks to the fast response of XpLoDWilD everything is fixed again !
XpLoDWilD said:
Can you please run this command in Terminal Emulator (or adb shell):
Code:
echo "10" > /sys/class/sec/sec_touchscreen/tsp_threshold
and tell me if it's better ?
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Thank you so much!!!
EDIT: For anyone who doesn't undestand
go to Terminal Emulator and type:
Code:
su
echo "10" > /sys/class/sec/sec_touchscreen/tsp_threshold
and then reboot so changes can take effect
If you have problems with touch sensivity:
XpLoDWilD said:
Just raise the "10" value. Something around 30 is nice, default is 50.
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alsgrigorjevs also made a video about this

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kevuin said:
Thanks to the fast response of XpLoDWilD everything is fixed again !
Thank you so much!!!
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i read the thread and i will post the XploDWilD's answer, i have read that 5 min ago lol

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It turned out that my phone had a Hardware defect after all, I flashed Stock and got it repaired !