Xperia SP flickering screen when flashing new kernels / ROMs.

[LoizosAristides]

Hey,
Whenever I try to flash another kernel which is required to flash a new rom to my SP, everything works just fine. Except that when I finish the flashing and boot up to the ROM, the screen seems to flicker a lot...
I tried turning auto brightness off, flashing another compatible kernel, and flashing a couple of scripts that claimed to fix the issue...
I am currently at the stock firmware, rooted and with unlocked bootloader.
What is weird is, when I flash the stock 12.1.A.1.205 firmware back...the screen stops flickering.
Any ideas?
Thanks in advance

 

[win32r]

Hey,
Whenever I try to flash another kernel which is required to flash a new rom to my SP, everything works just fine. Except that when I finish the flashing and boot up to the ROM, the screen seems to flicker a lot...
I tried turning auto brightness off, flashing another compatible kernel, and flashing a couple of scripts that claimed to fix the issue...
I am currently at the stock firmware, rooted and with unlocked bootloader.
What is weird is, when I flash the stock 12.1.A.1.205 firmware back...the screen stops flickering.
Any ideas?
Thanks in advance

it is bug cm11 kernel. (cm kernel based 12.1.A.0.266 kernel …=> flickeris bug

 

[LoizosAristides]

it is bug cm11 kernel. (cm kernel based 12.1.A.0.266 kernel …=> flickeris bug

It's not only the cm11 kernel, other kernels like DooMLoRD kernel, which is based on the stock fw also has this problem..
Are you saying that I use a lower firmware kernel on a newer firmware?

 

[win32r]

It's not only the cm11 kernel, other kernels like DooMLoRD kernel, which is based on the stock fw also has this problem..
Are you saying that I use a lower firmware kernel on a newer firmware?

DooMLoRD kernel based 12.1.A.0.266.
I advise you use cm11 for LBL + wiliams kernel v7.. => no flickeris bug

 

[LoizosAristides]

DooMLoRD kernel based 12.1.A.0.266.
I advise you use cm11 for LBL + wiliams kernel v7.. => no flickeris bug

Oh I didn't know that it's based on the .266
Thanks man, I hope Williams kernel works

 

[LoizosAristides]

DooMLoRD kernel based 12.1.A.0.266.
I advise you use cm11 for LBL + wiliams kernel v7.. => no flickeris bug

Ok so I should've mentioned that my bl is unlocked...
Also, williams kernel v7 is for 4.3...
I'm trying to flash cm11, for cm11 there's williams kernel v4...
I tried both the stock cm11 kernel and williams one and they both gave me flickering screen...
Any other ideas?

 

[win32r]

Any other ideas?

add to build.prop this lines:

# System property for cabl
ro.qualcomm.cabl=0

 

[LoizosAristides]

add to build.prop this lines:

# System property for cabl
ro.qualcomm.cabl=0

Can you tell me what does it do?

 

[win32r]

Can you tell me what does it do?

It is fix flikers bug! :laugh:

 

[LoizosAristides]

It is fix flikers bug! :laugh:

Hmm I'll try it tomorrow
Thanks for helping me dude...

 

[win32r]

Forget it)

 

[LoizosAristides]

Forget it)

Ok so I tested it out today...and it doesn't work
I am now convinced that it's a kernel problem, since I tried a lot of different versions of cm11, but I also used 4 different kernels, each one at the latest version, NOTHING!
Any other ideas?

 

[win32r]

Any other ideas?

Hm... I don't know..=( sorry
I tried to write in support of the CM. But the answer is no.

 

[LoizosAristides]

Hm... I don't know..=( sorry
I tried to write in support of the CM. But the answer is no.

That's ok...
Thanks for your time anyway

 

[pec0ra]

As win32r said, you should try a cm11 based ROM but for locked bootloader (they work for ubl too). With these roms you can use a kernel based on stock ( for example stock kernel or Williams kernel Sony version) which should fix your issue.
All roms that are for LBL will work with the stock kernel or Williams kernel v7. I wrote something about this in the Williams kernel website : http://williams-kernel.tk/help.php and I'll probably write this info on xda too if I have some time.

 

[LoizosAristides]

Wow. Apparently, your kernel is the only one that that doesn't give me a flickering screen
I tried an unofficial cm11 build along with it and it worked like a charm!
I just can't thank you both enough...
Finally I got a fully working cm11 on my SP