Question Lenovo Tab P12 2023 performance bug

[C-Jay]

So i have a lenovo Tab P12 (TB370FU, 8GB RAM, Dimensity 7050, 256GB storage) and i noticed the battery was draining a lot faster after i upgraded to android 15

A quick check from CPU-Z and i think i have discovered the problem, whenever the tablet receives input from the stylus/touchscreen/keyboard the CPU jumps to 100% clock speeds (2600 on the two P cores, 2000 on the six E cores), when it's not recieving any input it sits happily at the base clocks of 500 MHz (650 for the two P cores). Even simple stuff like resting your finger on the screen or touchpad makes it run fast which is kind of a big deal because i use this as my typing/sketching primary device [it's handier than booting a laptop afterall]

The build ID is TB370FU_ROW_OPEN_USER_V5_V_ZUI_17.0.187_ST_250817

The tablet's stopped recieving OS updates since it started off android 13

My question at hand, what would fix this? Should i try resetting the tablet or maybe look deeper into downgrading to older builds (presumably one on android 14?)

 

[C-Jay]

Mini update: factory reset didn't help, I guess I'll downgrade later in the day

 

[COLGeek]

How did you update to 15? From what source?

 

[C-Jay]

How did you update to 15? From what source?

The official one, from the settings ofcourse, I'm not the only one who has the bug, there has been an XDA post about it in around March too

I tried flashing back to android 14 yesterday (mtkclient) but it just didn't handshake so I don't want to push my luck

I'll wait for a patch i suppose

 

[sansart]

Your diagnosis with CPU-Z nails it: the Dimensity 7050's aggressive clocking (hitting max 2.6GHz on P-cores and 2GHz on E-cores) on even light touch input is a known quirk with the Lenovo Tab P12 (TB370FU), and it's gotten worse for some users after the Android 15/ZUI 17 update (your build, 17.0.187 from Aug 2025, is part of that wave). It's likely a firmware bug in how ZUI handles input polling or power management for the touchscreen/stylus/keyboard—causing the CPU to treat every contact as a "high-priority event" instead of throttling back efficiently. Idle at 500-650MHz is normal, but sustained max speeds during use explain the rapid drain (users report 20-30% drops in an hour of light sketching).