Re: [PATCH 2/2] ACPI: Store NVS state even when entering suspend to RAM

Maxim Levitsky
2010-06-10T09:41:24Z

On Fri, 2010-05-28 at 16:32 -0400, Matthew Garrett wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=13931 describes a bug where
> a system fails to successfully resume after the second suspend. Maxim
> Levitsky discovered that this could be rectified by forcibly saving
> and restoring the ACPI non-volatile state. The spec indicates that this
> is only required for S4, but testing the behaviour of Windows by adding
> an ACPI NVS region to qemu's e820 map and registering a custom memory
> read/write handler reveals that it's saved and restored even over suspend
> to RAM. We should mimic that behaviour to avoid other broken platforms.
Any chance to see this patch in 2.6.35?

Best regards,
Maxim Levitsky