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Old 10-07-2010, 03:32 PM
Leann Ogasawara
Default SRU: enable PCIEXP wakeup by clearing PCIEXP_WAKE_STS on resume

This appears to be making it's way into upstream stable [1]. Applied to
Maverick linux master as "pre-stable".


[1] http://lkml.org/lkml/2010/10/1/117

On Wed, 2010-10-06 at 13:22 +0100, Colin King wrote:
> From: Colin Ian King <colin.king@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(-)

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