This patch is in 3.8 kernel.
commit a2a96f0c7221806c8a8072b662e6deaa119833da
Author: AceLan Kao <acelan....@canonical.com>
Date: Wed Oct 3 11:26:31 2012 +0200
asus-wmi: add display toggle quirk
For machines with AMD graphic chips, it will send out WMI event and ACPI
interrupt at the same time while hitting the hotkey. BIOS will notify the
system the next display output mode throught WMI event code, so that
windows' application can show an OSD to tell the user which mode will be
taken effect. User can hit the display toggle key many times within 2
seconds to choose the mode they want. After 2 seconds, WMI dirver should
send a WMIMethod(SDSP) command to tell the BIOS which mode the user chose.
And then BIOS will raise another ACPI interrupt to tell the system to
really switch the display mode.
In Linux desktop, we don't have this kind of OSD to let users to choose
the mode they want, so we don't need to call WMIMethod(SDSP) to have
another ACPI interrupt. To simplify the problem, we just have to ignore
the WMI event, and let the first ACPI interrupt to send out the key event.
For the need, here comes another quirk to add machines with this kind of
behavior. When the WMI driver receives the display toggle WMI event, and
found the machin is in the list, it will do nothing and let ACPI video
driver to report the key event.
Signed-off-by: AceLan Kao <acelan....@canonical.com>
Signed-off-by: Corentin Chary <corenti...@iksaif.net>
Signed-off-by: Matthew Garrett <matthew.garr...@nebula.com>
** Changed in: linux (Ubuntu Quantal)
Status: In Progress => Triaged
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https://bugs.launchpad.net/bugs/1052278
Title:
[ASUS][X501U][X401U] Fn + F8 display mode switch hot key will switch
the mode 2 times by one single key stroke
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