[coreboot] AMD S3: Experiences with ACPI 2.0 method _BFS (Back From Sleep)

Paul Menzel paulepanter at users.sourceforge.net
Mon Feb 18 17:09:38 CET 2013

Dear coreboot folks,

searching for ACPI in the output of `dmesg` I noticed the following

        $ uname -v
        #1 SMP Debian 3.2.35-2
        $ dmesg | grep -i acpi
        [    0.154063] ACPI: BIOS offers _BFS
        [    0.154067] ACPI: If "acpi.bfs=1" improves resume, please notify linux-acpi at vger.kernel.org


   $ git grep _GTA

reveals that it is only implemented in the DSDT of AMD based boards. As
resuming currently does not work on the ASRock E350M1 [1], I cannot test

Was this ever tested by adding `acpi.bfs=1` to the Linux kernel command
line and what was the outcome? A test on AMD Persimmon would be very

It looks like support for this has been removed in the meantime though

        commit 3f6f49c7854c9294119437a82c5b35be78f9cea6
        Author: Len Brown <len.brown at intel.com>
        Date:   Thu Jul 26 20:08:54 2012 -0400
            ACPI: delete _GTS/_BFS support

since Linux Git tag v3.6-rc2.



[1] http://www.coreboot.org/ASRock_E350M1
[2] https://patchwork.kernel.org/patch/1246671/
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