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Strange issues with P751TM1-G...

Computer Networking and Wireless Forum - forum.desktopreview.com
I've run into a couple weird issues with this laptop after putting it to sleep a few times in the same session:

- Can't adjust screen brightness using Fn+F8/Fn+F9 anymore

- The sleep button (Fn+F12), power button, and closing the lid stop working for putting it to sleep

- The laptop stops detecting the charger (thinks it's still plugged in when unplugged, and vice-versa)

#1 and #2 have easy workarounds, just adjust brightness in Windows and sleep from the Start Menu.

#3 is a bit more serious though. It doesn't throttle the CPU and GPU when running off battery because it thinks it's still plugged in (battery % drains but icon says "plugged in, not charging), which seems like an easy way to kill the battery. Imagine if I have a power outage while gaming and the laptop continues to run full-bore off battery power.

On the flip side, it also doesn't unthrottle the system if it thinks it's running off battery despite being plugged in.

I have to put the laptop to sleep and resume in order for it to correctly detect charger status every time I plug/unplug it.

These issues do not happen on a fresh boot, only after putting the laptop to sleep a few times.

Maybe this system's ACPI was designed for Windows 10 and doesn't play nice with Windows 7?

Or a BIOS/EC bug?

FWIW, I have FlexiCharger in BIOS disabled.

 


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