Help LAG Galaxy Note 4 (SM-N910F) lollipop 5.1.1

broli95 · Nov 24, 2015

Hello everybody, hope you can help me. The problem is, everytime I use a 3D game (almost all of them), after the phone heats up a bit there's a massive fps drop and it stays like that even if i change game. By using trepn profiler i saw that it's stuck at 200mhz of gpu frequency and 20% of cpu; when i use the recent apps button and go back it's ultra smooth, then after 3 seconds it lags again. What can I do? It's really annoying since the same games go perfectly on my note 3 :/

touringhaggis · Nov 25, 2015

Hi,

First of all, welcome to the forum!

Obviously the phone is throttling the CPU/GPU because of the temperature rise. The question would be: why is the temperature rising so fast. Is this a problem that you have always had with the Note 4 or has it started after an update or some other known change? For example: have you tested the same phone with kitkat? I also have the 910F with kitkat and have never had this issue.

Regards,
Eric.

broli95 · Nov 25, 2015

I had it with lollipop 5.0.1 and it already had the problem, same when updated to 5.1.1

broli95 · Nov 25, 2015

touringhaggis said:
Hi,

First of all, welcome to the forum!

Obviously the phone is throttling the CPU/GPU because of the temperature rise. The question would be: why is the temperature rising so fast. Is this a problem that you have always had with the Note 4 or has it started after an update or some other known change? For example: have you tested the same phone with kitkat? I also have the 910F with kitkat and have never had this issue.

Regards,
Eric.

I had it with lollipop 5.0.1 and it already had the problem, same when updated to 5.1.1

touringhaggis · Nov 26, 2015

Given that nobody else is chiming in, I am going to assume that this is not a common problem. I would suspect a hardware issue at this point (unless you have the phone in a very thick case that insulates heat really well). You may want to take it back to the shop / Samsung service center to see if they can help.

One other thing that you could try, to rule out a battery fault, would be to take out the battery and boot the phone running of the charging cable (you could also leave off the back cover and remove any SD cards you have installed). If you still have the problem then I would be most suspicious of the hardware.

Regards,
Eric.

broli95 · Nov 26, 2015

touringhaggis said:
Given that nobody else is chiming in, I am going to assume that this is not a common problem. I would suspect a hardware issue at this point (unless you have the phone in a very thick case that insulates heat really well). You may want to take it back to the shop / Samsung service center to see if they can help.

One other thing that you could try, to rule out a battery fault, would be to take out the battery and boot the phone running of the charging cable (you could also leave off the back cover and remove any SD cards you have installed). If you still have the problem then I would be most suspicious of the hardware.

Regards,
Eric.

Ehy that's not a bad idea, thanks! I'll try

broli95 · Nov 26, 2015

touringhaggis said:
Given that nobody else is chiming in, I am going to assume that this is not a common problem. I would suspect a hardware issue at this point (unless you have the phone in a very thick case that insulates heat really well). You may want to take it back to the shop / Samsung service center to see if they can help.

One other thing that you could try, to rule out a battery fault, would be to take out the battery and boot the phone running of the charging cable (you could also leave off the back cover and remove any SD cards you have installed). If you still have the problem then I would be most suspicious of the hardware.

Regards,
Eric.

Ok unfortunately the note 4 can't boot even if it's with the charging cable only. Even tried to boot it with both battery and cable, then tried to remove the battery, it immediately goes black and shuts down

touringhaggis · Nov 27, 2015

broli95 said:
Ok unfortunately the note 4 can't boot even if it's with the charging cable only. Even tried to boot it with both battery and cable, then tried to remove the battery, it immediately goes black and shuts down

Damn, that's weird, I would have expected that to work. Ok, similar test: Take the back cover off and start a power hungry app. Feel where the heat is coming from. If it is the top of the phone (above the battery) then that is the CPU/GPU, if it is lower down then it is the battery.

Regards,
Eric.

broli95 · Nov 27, 2015

touringhaggis said:
Damn, that's weird, I would have expected that to work. Ok, similar test: Take the back cover off and start a power hungry app. Feel where the heat is coming from. If it is the top of the phone (above the battery) then that is the CPU/GPU, if it is lower down then it is the battery.

Regards,
Eric.

Ok there isn't much of a difference but i think it's above the battery

broli95 · Nov 28, 2015

touringhaggis said:
Damn, that's weird, I would have expected that to work. Ok, similar test: Take the back cover off and start a power hungry app. Feel where the heat is coming from. If it is the top of the phone (above the battery) then that is the CPU/GPU, if it is lower down then it is the battery.

Regards,
Eric.

Tried again with CSR Racing 2, the battery is completely normal ( doesn't even seem to heat up), instead the part above it heats up way more, not a lot but enough to say the temperature is different enough

AZgl1500 · Nov 28, 2015

I have a Note 4 that I just acquired about a week ago.

I do not play games at all, so no reference point there.
so far, it is smooth as glass.

broli95 · Nov 28, 2015

AZgl1500 said:
I have a Note 4 that I just acquired about a week ago.

I do not play games at all, so no reference point there.
so far, it is smooth as glass.

Why did you write a post then? Glad it's smooth for you but it doesn't help me

touringhaggis · Nov 30, 2015

broli95 said:
Tried again with CSR Racing 2, the battery is completely normal ( doesn't even seem to heat up), instead the part above it heats up way more, not a lot but enough to say the temperature is different enough

Hmm, when I am analysing my chess games with my phone (I know I should use a computer for that), the phone heats up like crazy which I would expect (I can feel the heat through the screen, it is that hot), but I never see a performance drop. I am guessing here, but I would say that your phone is almost fine, but the temperature sensor is out of whack causing it to throttle the CPU aggressively. I think at this point a call to Samsung,a visit to a service center or your shop would be warranted. I hope they can fix your phone quickly and without too much stress.

Regards,
Eric.

Help LAG Galaxy Note 4 (SM-N910F) lollipop 5.1.1

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