CM7 Touch Screen freezes / Input failures from time to time

[Guest rapidone]

Hello everybody,

I have a 1st gen SF TFT (UK) and I'm using CM7 Nightly 38. When I boot my phone the touch screen works perfectly. Then after clicking around or play, it starts to produce errors.

1) It doesn't point to the right point. -> You can touch in the middle of the screen and it points to the top of the screen

2) It completeley freezes / stops to work

After some seconds 15-30 everything is fine again.

Any hint what I should do to fix it?

EDIT 1:

N36 was no help for me. It's even getting worser as I got totally touch screen freezes at lockoff screen. No fun to take off the battery all the time. :)

EDIT 2:

Maybe I restored something from 2.2 (Fou-lus hint).

I wiped(factory reset phone), cleared cache and dalvik cache and installed CM7 stable. Still the freeze issue :)

EDIT 3:

I installed CM7 special touchscreen kernel Touchscreen fix

No freeze for 10 minutes.... but again problems.... :)

EDIT 4:

I downgraded to RC4. It was better, but the probs came back

EDIT 5:

Switched to Swedish Spring RLS5 (factory reset, cache and dalvik cache reset). It worked fine for some days. But freezes came back...

Edited April 24, 2011 by rapidone

[Guest Fou-lu]

Hello everybody,

I have a 1st gen SF TFT (UK) and I'm using CM7 Nightly 38. When I boot my phone the touch screen works perfectly. Then after clicking around or play, it starts to produce errors.

1) It doesn't point to the right point. -> You can touch in the middle of the screen and it points to the top of the screen

2) It completeley freezes / stops to work

After some seconds 15-30 everything is fine again.

Any hint what I should do to fix it?

did you restore anything from 2.2? apps via titanium etc.

Edited April 12, 2011 by Fou-lu

[Guest alex1alex2alex3alex4]

Hello everybody,

I have a 1st gen SF TFT (UK) and I'm using CM7 Nightly 38. When I boot my phone the touch screen works perfectly. Then after clicking around or play, it starts to produce errors.

1) It doesn't point to the right point. -> You can touch in the middle of the screen and it points to the top of the screen

2) It completeley freezes / stops to work

After some seconds 15-30 everything is fine again.

Any hint what I should do to fix it?

"Downgrade" to N36, that's the last nightly I found to be stable and non-freezing.

[Guest rapidone]

"Downgrade" to N36, that's the last nightly I found to be stable and non-freezing.

Thanks for the hint.. I downgraded. The issue is not completely solved but a lot better.

[Guest rapidone]

... still the freezing issue ...

[Guest isambard]

Does pressing the power button to turn off screen and then back again un-freeze it?

Also, on the other touchscreen freeze thread, somebody posted a patched CM7 kernel. You could see if that fixes it...

[Guest rapidone]

Does pressing the power button to turn off screen and then back again un-freeze it?

Also, on the other touchscreen freeze thread, somebody posted a patched CM7 kernel. You could see if that fixes it...

I installed the new kernel and no, top Button trick didn't help.

I rebooted the phone again. At the moment it works. Hope that it's fixed now.

I'm thinking of switching back to FROYO again. Do you think that'll help?

[Guest Rotmann]

If you get alternative freezes it may be your digitizer. Flash a 2.1 or a 2.2 and look, if you still have the problem it's the digitizer, the most common blade failure as it's badly designed and placed.

[Guest rapidone]

If you get alternative freezes it may be your digitizer. Flash a 2.1 or a 2.2 and look, if you still have the problem it's the digitizer, the most common blade failure as it's badly designed and placed.

I downgraded to CM7 RC4 and don't have touch screen problems any more. So something in the new ROMs was changed that causes problems on my phone.

[Guest rapidone]

I downgraded to CM7 RC4 and don't have touch screen problems any more. So something in the new ROMs was changed that causes problems on my phone.

Probs are back - I updated first post. What can I do now to solve the prob? Change the digitizer? But a lot of people have severe probs after doing that.

[Guest heavyduty00]

I think if you reboot phone, and leave it for 5-10 minutes to load everything properly, touchscreen freezes will go? Not sure if it works for everyone though, and i am on cm7 stable but helps me, as when i instantly use my phone after a reboot, the touchscreen fails and I have some immense lag.

[Guest ThrashMan]

I had the touch screen reporting my finger location incorrectly this morning. After much messing about I dismantled the phone and reseated the LCD screen. May have been a dodgy contact but all seems ok now.

[Guest darkado]

I had the touch screen reporting my finger location incorrectly this morning. After much messing about I dismantled the phone and reseated the LCD screen. May have been a dodgy contact but all seems ok now.

how exactly to do this?