The HP Pavilion g6-1d80nr predates Windows 8, so it defaults to using
acpi_video# for backlight control, but this is non functional on
this model.

Add a DMI quirk to use the native backlight interface which does
work properly.

Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
 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 fb526ba8825b..c660dd6f896e 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -618,6 +618,15 @@ static const struct dmi_system_id video_detect_dmi_table[] 
= {
                DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
                },
        },
+       {
+        .callback = video_detect_force_native,
+        /* HP Pavilion g6-1d80nr / B4U19UA */
+        .matches = {
+               DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+               DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
+               DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
+               },
+       },
        {
         .callback = video_detect_force_native,
         /* Samsung N150P */
-- 
2.39.0

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