[Lucid, Maverick] SRU: enable PCIEXP wakeup by clearing PCIEXP_WAKE_STS on resume

Stefan Bader stefan.bader at canonical.com
Wed Oct 6 13:13:25 UTC 2010


On 10/06/2010 01:22 PM, Colin King wrote:
> From: Colin Ian King <colin.king at canonical.com>
> 
> SRU Justification:
> 
> Impact: It has been observed on a AMD K325 netbook that resumes hang in the 
> BIOS if PCI Express ethernet is enabled on the 2nd or 3rd resume. Disabling 
> the ethernet has shown that the resume works flawlessly. This has been tracked 
> down to the fact that a PCI Express Wake event has occurred and the kernel 
> is not clearing the PM1 PCIEXP_WAKE_STS bit when coming out of resume.
> 
> Fix: Clearing PCIEXP_WAKE_STS on resume fixes the resume hang. 
> 
> Testcase: Without the patch, resume hangs in the BIOS after 2nd or 3rd resume.
> With the patch, resume works flawlessly everytime.
> 
> Patch is from upstream commit 573b638158029898caf9470c8214b7ddd29751e3
> 
> BugLink: http://bugs.launchpad.net/bugs/613381
> 
> Colin Ian King (1):
>   ACPI: enable repeated PCIEXP wakeup by clearing PCIEXP_WAKE_STS on
>     resume
> 
>  drivers/acpi/acpica/aclocal.h |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> 
In essence the same question as Tim had, though I had been thinking you had.
Otherwise looks good.

Acked-by: Stefan Bader <stefan.bader at canonical.com>




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