Commit d21a9162 authored Dec 17, 2019 by Hans de Goede Committed by Rafael J. Wysocki Dec 19, 2019

ACPI: video: Do not export a non working backlight interface on MSI MS-7721 boards

Despite our heuristics to not wrongly export a non working ACPI backlight
interface on desktop machines, we still end up exporting one on desktops
using a motherboard from the MSI MS-7721 series.

I've looked at improving the heuristics, but in this case a quirk seems
to be the only way to solve this.

While at it also add a comment to separate the video_detect_force_none
entries in the video_detect_dmi_table from other type of entries, as we
already do for the other entry types.

Cc: All applicable <stable@vger.kernel.org>
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1783786


Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 53870cf0

drivers/acpi/video_detect.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -352,6 +352,11 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
		DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
		},
		},

		/*
		* Desktops which falsely report a backlight and which our heuristics
		* for this do not catch.
		*/
		{
		.callback = video_detect_force_none,
		.ident = "Dell OptiPlex 9020M",
		@@ -360,6 +365,14 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
		DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
		},
		},
		{
		.callback = video_detect_force_none,
		.ident = "MSI MS-7721",
		.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
		DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
		},
		},
		{ },
		};

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