UX301 won't wake up or reboot : ACPI malfunction ?

Hi all.

I am experiencing troubles on my one year old UX301LA...

Two month ago, I updated all drivers directly from the manufacturers (Intel, Asus, Realtek...). Then, I installed Windows 8.1 update 1. Now, here are the symptoms :
- When I wake up from sleep (opening the lid or pressing a key), only the power led illuminates and the screen stays blank.
- When I shut down, only the power led stays on during at least 10 seconds. Cannot do anything until it full shuts down.
- When I reboot from Windows, same problem, and the computer shuts down. I have to press the button manually to restart.
- When I reboot from Ubuntu or BIOS ("save changes and exit"), then it shuts down normally but it won't restart neither.
- When I shut down from Ubuntu live, it seems to power off normally.

Here is what I tried to fix it :

- Updating BIOS to v.209
- Reinstalling Windows 8.1.1
- Using different drivers
- Uninstalling ISCT
- All possible BIOS settings
- All possible Asus software settings
- All possible Windows Settings
- Same tests after installing Windows, but only with Intel HD drivers installed
etc...

The strange things :
- Months ago, this happened when I tried to install Ubuntu. The bug fixed almost itself after a week using Windows. But I don't remember what I did.
- When I go to BIOS and switch both "Intel Virtualisation" and "VT-d" (no matter disable or enable), then my computer recovers his normal behaviour : When I save and exit, the computer reboot. I can go S3 and wake up normally. But after a second boot, then the problem comes back and I have to switch options again.

Big mistery, isn't it ?
Any ideas or aware users ?

Thanks, and sorry for my English.

 

Ok, I answer :

I finally fixed the bug myself. Here is what I did :

- Go to BIOS and switch "Intel Virtualisation" again in order to restore normal computer behaviour
- Install Windows 8.1.1
- Immediatly disable Windows Update to avoid drivers auto install
- Just install the oldest ATK drivers for UX301LA from Asus
- Download and install BIOS WinFlash from Asus
- Download and older BIOS (v.206)
- Reboot to ensure that power management is still working normally
- Flash the old BIOS using /nodate parameter for WinFlash
- Then, install all original drivers from Asus
- Flash lastest BIOS
- Achieve Windows Update
- This is magic ! All is working flawless now

I may have an explanation about what happened but I'm not sure and not good at English. So I will explain only if someone interested in.

EDIT : How can I set the topic title to RESOLVED ?

 

It could be the windows re install since quite a few people had issues going from 8 to 8.1

 

Well done.
You can't change the topic title except the moderators, but at least you left an EDIT note.