[PATCH][V2] ACPI: video: use ACPI backlight for HP 635 Notebook

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Default backlight interface is AMD's radeon_bl0 which does not work on
this system. As a result, let's for ACPI backlight interface for this
system.

BugLink: https://bugs.launchpad.net/bugs/1894667

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Alex Hung <alex.hung@xxxxxxxxxxxxx>
---

V2: correct Cc to stable

 drivers/acpi/video_detect.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 2499d7e..05047a3 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -282,6 +282,15 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
 		DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 		},
 	},
+	/* https://bugs.launchpad.net/bugs/1894667 */
+	{
+	 .callback = video_detect_force_video,
+	 .ident = "HP 635 Notebook",
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
+		},
+	},
 
 	/* Non win8 machines which need native backlight nevertheless */
 	{
-- 
2.7.4




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