[PATCH 2/6][SRU][N] Revert "UBUNTU: SAUCE: ACPI: video: Dell AIO UART backlight detection"

[AceLan Kao]

From: "Chia-Lin Kao (AceLan)" <acelan.kao at canonical.com>

BugLink: https://bugs.launchpad.net/bugs/2083800

This reverts commit e45b1cda283d20d5deb0bb64f13185aee67f1c86.

There is a same mechanism implemented by the upstream. We'll use the
equivalent one from upstream.
cd8e468efb4fb ("ACPI: video: Add Dell UART backlight controller detection")

Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao at canonical.com>
---
 drivers/acpi/video_detect.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 675d653b39796..d29ddec3eecc2 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -950,7 +950,6 @@ enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto
 	static DEFINE_MUTEX(init_mutex);
 	static bool nvidia_wmi_ec_present;
 	static bool apple_gmux_present;
-	static bool dell_uart_backlight_present;
 	static bool native_available;
 	static bool init_done;
 	static long video_caps;
@@ -965,7 +964,6 @@ enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto
 				    &video_caps, NULL);
 		nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
 		apple_gmux_present = apple_gmux_detect(NULL, NULL);
-		dell_uart_backlight_present = acpi_dev_found("DELL0501");
 		init_done = true;
 	}
 	if (native)
@@ -996,9 +994,6 @@ enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto
 	if (apple_gmux_present)
 		return acpi_backlight_apple_gmux;
 
-	if (dell_uart_backlight_present)
-		return acpi_backlight_vendor;
-
 	/* Use ACPI video if available, except when native should be preferred. */
 	if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
 	     !(native_available && prefer_native_over_acpi_video()))
-- 
2.43.0