I'm having a strange issue with my ASUS laptop and I'm trying to figure out whether this is a hardware, BIOS/EC, or Windows power-management problem.

Specs:

• ASUS laptop
• Intel Core i5
• Intel Iris Xe graphics
• Windows 11

The problem

The laptop won't start unless I connect the charger.

Even when it does manage to start on battery, I often get a blank/black screen for an unknown amount of time. During this time, the laptop gets extremely hot even though I'm not doing anything.

Previously, I discovered a weird workaround: if I connected the laptop's USB-C port to a USB-A port using a data cable, the ASUS logo would sometimes appear and the laptop would continue booting. This workaround doesn't work anymore.

The CPU also reaches 80°C+ on average in HWiNFO, even when I don't expect it to be under heavy load.

Once Windows finally starts, I noticed that the power mode resets to the performance mode every time I boot. I deleted that plan in control panel. but it's will be there in next bootup.

If I manually select the appropriate power/performance mode in Windows/Control Panel, everything starts behaving normally. The CPU temperatures and performance are fine after that.

Things I've already tried

• Checked BIOS for relevant power settings — couldn't find anything useful.
• Tried setting ThrottleStop to start with Windows/at boot — didn't solve the issue
• Disabled performance boost in the Balanced power plan
• Checked ASUS/MyASUS settings
• Manually selecting the correct power mode after every boot temporarily fixes the high-temperature/performance issue

But the battery-only boot/black-screen problem remains.

I'm wondering if this could be related to the battery, Embedded Controller (EC), BIOS/firmware, ASUS power-management software, or Windows power plans.

Has anyone experienced something similar with an ASUS laptop? Any Solution