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acer-wmi: Add acpi_backlight=video quirk for the Acer KAV80
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The acpi-video backlight interface on the Acer KAV80 is broken, and worse
it causes the entire machine to slow down significantly after a suspend/resume.

Blacklist it, and use the acer-wmi backlight interface instead. Note that
the KAV80 is somewhat unique in that it is the only Acer model where we
fall back to acer-wmi after blacklisting, rather then using the native
(e.g. intel) backlight driver. This is done because there is no native
backlight interface on this model.

BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1128309
Cc: stable@vger.kernel.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
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Hans de Goede authored and Darren Hart committed Oct 28, 2014
1 parent 5a1426c commit 183fd8f
Showing 1 changed file with 11 additions and 0 deletions.
11 changes: 11 additions & 0 deletions drivers/platform/x86/acer-wmi.c
Original file line number Diff line number Diff line change
Expand Up @@ -579,6 +579,17 @@ static const struct dmi_system_id video_vendor_dmi_table[] __initconst = {
DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
},
},
{
/*
* Note no video_set_backlight_video_vendor, we must use the
* acer interface, as there is no native backlight interface.
*/
.ident = "Acer KAV80",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
},
},
{}
};

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