I am using S21 Ultra (Exynos version) firmware G99BXXUU1AUB8. I observed a weird bug where the S21 heat problem is related to power saving mode turned on from Bixby routine
My phone is working fine initially with the heat is under acceptable range.
One day, I turned on power saving mode using bixby routine. The phone is working as intended with reduced brightness and reduce cpu power and etc... no problem.
But, after I turned off the power saving mode by myself. The weird heating problem started..
A simple browsing/open apps/any normal action on the phone will cause huge heat from the phone. sometimes I even received the message where phone is overheating.
Toggling power saving mode off/on doesnt helps anything and it seems irrecoverable.
I tried wipe cache and then reset app setting but it is to no avail.
Only when I entered to bootloader mode, do a cache wipe and factory reset, the phone is back to normal
To my curiosity, I don't believe a power saving mode could cause such a huge heat problem.
So, I tried to setup my phone again, making sure the phone is working normal.
I use bixby to turned on power saving mode again then manually turned off power saving mode.
Woalah, the heat problem comes back!
Total I tried for 3 times and indeed turned on power saving mode from bixby routine and turned off manually will cause a continuous heat problem on samsung s21 ultra.
