That's basically how this problem is born. Intel_pstate and the default ASPM bios settings eventually make the mobo's Embedded Controller go crazy and persist in this state until the battery is detached from the motherboard. Only do so when running on AC, and please repeat Stage 3 (no matter how boring) of this manual once you are done. There are a few sad cases, like reinstalling Ubuntu itself, where you will _have_ to boot from a live USB utilizing the problematic intel_pstate driver. If you try to, you will merely reproduce the problem once again, and will subsequently have to disassemble your Zenbook once again. Take care, however, not to _ever_ use any live USB stick or installation / recovery CDs based on Linux and using the intel_pstate driver and / or the default BIOS settings for ASPM.

The only way to reset it is to detach the battery for a few minutes.Ĥ. With certain power management settings on the OS side, the EC (Embedded Controller) goes crazy and thus needs resetting. There are plenty of youtube videos showing how to safely disassemble the various Asus laptops. Shut down the device, carefully remove the bottom cover and detach the big battery (not the tiny CMOS battery) from the motherboard for five minutes. Install the package tlp from ppa:linrunner/tlp an set at least the following values in /etc/default/tlpģ. Intel_pstate=disable pcie_aspm=force acpi_osi='Windows 2009' acpi_os_name='Windows 2009'ĭon't forget to execute sudo update-grub afterwards!Ģ. Add the following boot arguments _both_ to GRUB_CMDLINE_LINUX_DEFAULT and GRUB_CMDLINE_LINUX in /etc/default/grub.cfg: This seems to be working with any Asus laptop suffering from unexpected shutdowns and / or hangs while running on battery:ġ. How to recompile kernel for Ubuntu 12.04 LTS and ux31eįinally, a reliable solution for unexpected shutdowns and hangs was discovered!.

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