4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Hans de Goede <hdegoede@xxxxxxxxxx> commit bbf038618a24d72e2efc19146ef421bb1e1eda1a upstream. Just like many other Samsung models, the 670Z5E needs to use the acpi-video backlight interface rather then the native one for backlight control to work, add a quirk for this. Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1557060 Cc: All applicable <stable@xxxxxxxxxxxxxxx> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/acpi/video_detect.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -214,6 +214,15 @@ static const struct dmi_system_id video_ }, }, { + /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */ + .callback = video_detect_force_video, + .ident = "SAMSUNG 670Z5E", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"), + }, + }, + { /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */ .callback = video_detect_force_video, .ident = "SAMSUNG 730U3E/740U3E",