1 files changed, 53 insertions, 13 deletions

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 14d6d81e536f..e85729fc481f 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -277,6 +277,43 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
 	},
 
 	/*
+	 * Models which need acpi_video backlight control where the GPU drivers
+	 * do not call acpi_video_register_backlight() because no internal panel
+	 * is detected. Typically these are all-in-ones (monitors with builtin
+	 * PC) where the panel connection shows up as regular DP instead of eDP.
+	 */
+	{
+	 .callback = video_detect_force_video,
+	 /* Apple iMac14,1 */
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
+		DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
+		},
+	},
+	{
+	 .callback = video_detect_force_video,
+	 /* Apple iMac14,2 */
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
+		DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
+		},
+	},
+
+	/*
+	 * Older models with nvidia GPU which need acpi_video backlight
+	 * control and where the old nvidia binary driver series does not
+	 * call acpi_video_register_backlight().
+	 */
+	{
+	 .callback = video_detect_force_video,
+	 /* ThinkPad W530 */
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
+		},
+	},
+
+	/*
 	 * These models have a working acpi_video backlight control, and using
 	 * native backlight causes a regression where backlight does not work
 	 * when userspace is not handling brightness key events. Disable
@@ -497,6 +534,14 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
 	},
 	{
 	 .callback = video_detect_force_native,
+	 /* Acer Aspire 3830TG */
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3830TG"),
+		},
+	},
+	{
+	 .callback = video_detect_force_native,
 	 /* Acer Aspire 4810T */
 	 .matches = {
 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
@@ -774,7 +819,7 @@ static bool prefer_native_over_acpi_video(void)
  * Determine which type of backlight interface to use on this system,
  * First check cmdline, then dmi quirks, then do autodetect.
  */
-static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
+enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
 {
 	static DEFINE_MUTEX(init_mutex);
 	static bool nvidia_wmi_ec_present;
@@ -799,6 +844,9 @@ static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
 		native_available = true;
 	mutex_unlock(&init_mutex);
 
+	if (auto_detect)
+		*auto_detect = false;
+
 	/*
 	 * The below heuristics / detection steps are in order of descending
 	 * presedence. The commandline takes presedence over anything else.
@@ -810,6 +858,9 @@ static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
 	if (acpi_backlight_dmi != acpi_backlight_undef)
 		return acpi_backlight_dmi;
 
+	if (auto_detect)
+		*auto_detect = true;
+
 	/* Special cases such as nvidia_wmi_ec and apple gmux. */
 	if (nvidia_wmi_ec_present)
 		return acpi_backlight_nvidia_wmi_ec;
@@ -829,15 +880,4 @@ static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
 	/* No ACPI video/native (old hw), use vendor specific fw methods. */
 	return acpi_backlight_vendor;
 }
-
-enum acpi_backlight_type acpi_video_get_backlight_type(void)
-{
-	return __acpi_video_get_backlight_type(false);
-}
-EXPORT_SYMBOL(acpi_video_get_backlight_type);
-
-bool acpi_video_backlight_use_native(void)
-{
-	return __acpi_video_get_backlight_type(true) == acpi_backlight_native;
-}
-EXPORT_SYMBOL(acpi_video_backlight_use_native);
+EXPORT_SYMBOL(__acpi_video_get_backlight_type);