[Vivid SRU] Improve and match PCI ASPM behaviours to Windows

[Andy Whitcroft]

On Fri, Apr 24, 2015 at 02:59:00PM +0800, Alex Hung wrote:
> SRU Justification: 
> 
> Impact: 
>  ACPI's FADT has a flag "PCIe ASPM Controls" is defined "If set, indicates to
>  OSPM that it must not enable OSPM ASPM control on this platform." It means
>  OS should leave ASPM configurated by BIOS, not OS should disable ASPM.
> 
> Fix:
>  This patch changes ASPM behaviours to leave it is instead of disabling
>  it when FADT sets "PCIe ASPM Controls". This also matches Windows'
>  behaviours.
> 
> The commit is 387d37577fdd05e9472c20885464c2a53b3c945f in upstream kernel
> 
> BugLink: http://bugs.launchpad.net/bugs/1441335
> 

I see you have submitted this for Trusty and Vivid, does this need to be
considered, and tested on Utopic as well ?

-apw