acpi/video_detect: blacklist samsung x360

[~andy/linux] / drivers / acpi / video_detect.c

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 942fa2a998f79b22aacc6099216e8c673992bbc8..b728880ef10e92d4baac018babd1b515c9c06f5f 100644 (file)
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -132,6 +132,33 @@ find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
        return AE_OK;
 }
 
+/* Force to use vendor driver when the ACPI device is known to be
+ * buggy */
+static int video_detect_force_vendor(const struct dmi_system_id *d)
+{
+       acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
+       return 0;
+}
+
+static struct dmi_system_id video_detect_dmi_table[] = {
+       /* On Samsung X360, the BIOS will set a flag (VDRV) if generic
+        * ACPI backlight device is used. This flag will definitively break
+        * the backlight interface (even the vendor interface) untill next
+        * reboot. It's why we should prevent video.ko from being used here
+        * and we can't rely on a later call to acpi_video_unregister().
+        */
+       {
+        .callback = video_detect_force_vendor,
+        .ident = "X360",
+        .matches = {
+               DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+               DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
+               DMI_MATCH(DMI_BOARD_NAME, "X360"),
+               },
+       },
+       { },
+};
+
 /*
  * Returns the video capabilities of a specific ACPI graphics device
  *
@@ -164,6 +191,8 @@ long acpi_video_get_capabilities(acpi_handle graphics_handle)
                 *              ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
                 *}
                 */
+
+               dmi_check_system(video_detect_dmi_table);
        } else {
                status = acpi_bus_get_device(graphics_handle, &tmp_dev);
                if (ACPI_FAILURE(status)) {