Ubuntu – Error parsing PCC subspaces from PCCT: ACPI PCC probe failed


I have a Lenovo Thinkpad e540 laptop with dual graphics, Intel integrated and Nvidia GT 740m Discrete. After changing from nouveau drivers to Nvidia binary driver 346.82 proprietary before login screen I've got a message:

[0.646495]Error parsing PCC subspaces from PCCT
[0.646521]ACPI PCC probe failed.

Kernel version:

3.19.0-26-generic #28~14.04.1-Ubuntu SMP Wed Aug 12 14:09:17 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

I've read somewhere that if I put in grub file quiet splash nomodeset that will fix this, but that doesn't work for me, then I get into login loop.

How can I fix this?

Best Answer

I had the same problem after installing Ubuntu 16.04 on the Lenovo w540 with preinstalled Win 8.1. It appeared that I didn't install Ubuntu with correct bootloader. The Windows was booting in UEFI mode while the Ubuntu in BIOS mode.So I've reinstalled Ubuntu, but this time I read:


  1. When I created a bootable USB key from the ISO image I made sure it will boot in UEFI mode = I used Rufus and chose 'GPR partition for UEFI' as a partition type for the bootable USB key (they say that there is a version of YUMI that support UEFI as well - didn't try it though )
  2. In my BIOS settings I've disallowed booting other than UEFI to make sure my USB key will boot with UEFI (I did the opposite of https://neosmart.net/wiki/enable-legacy-boot-mode/).
  3. The Ubuntu knew that it was booted from UEFI bootloader and it installed with UEFI bootloader as well.

The problem with the PCC parsing... didn't appear since then.

I don't know if it's relevant but I've installed Ubuntu on a separate drive with separate efi partition.In my BIOS settings I have now another entry on the boot order list: 'ubuntu'. It was placed by the Ubuntu installer on the first place so I moved it below the USB stuff but above the Windows Boot Manager so I can boot from USB key or choose from the GRUB2 boot menu which system to boot on each restart.

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