path: root/drivers/acpi/scan.c
diff options
authorRafael J. Wysocki <rjw@sisk.pl>2008-11-26 17:53:13 -0500
committerLen Brown <len.brown@intel.com>2008-11-26 17:53:13 -0500
commit65df78473ffbf3bff5e2034df1638acc4f3ddd50 (patch)
tree7fd62d4e040fc66d9db3a574fb20e467ba575453 /drivers/acpi/scan.c
parent40599072dca3ec7d4c9ff8271978be169f974638 (diff)
ACPI suspend: Blacklist boxes that require us to set SCI_EN directly on resume
Some Apple boxes evidently require us to set SCI_EN on resume directly, because if we don't do that, they hung somewhere in the resume code path. Moreover, on these boxes it is not sufficient to use acpi_enable() to turn ACPI on during resume. All of this is against the ACPI specification which states that (1) the BIOS is supposed to return from the S3 sleep state with ACPI enabled (SCI_EN set) and (2) the SCI_EN bit is owned by the hardware and we are not supposed to change it. For this reason, blacklist the affected systems so that the SCI_EN bit is set during resume on them. [NOTE: Unconditional setting SCI_EN for all system on resume doesn't work, because it makes some other systems crash (that's to be expected). Also, it is not entirely clear right now if all of the Apple boxes require this workaround.] This patch fixes the recent regression tracked as http://bugzilla.kernel.org/show_bug.cgi?id=12038 Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Tested-by: Tino Keitel <tino.keitel@gmx.de> Tested-by: Bob Copeland <me@bobcopeland.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/scan.c')
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