From bd38add8120c2f6915d2e117b697843bd23ce573 Mon Sep 17 00:00:00 2001 From: Corentin Chary Date: Wed, 13 Jun 2012 09:32:04 +0200 Subject: [PATCH] acpi/video_detect: blacklist samsung x360 commit 084940d5b101e9ca91a689eb5048151b14076839 upstream. On Samsung X360, the BIOS will set a flag (VDRV) if the 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(). Signed-off-by: Corentin Chary Signed-off-by: Matthew Garrett Signed-off-by: Ben Hutchings --- drivers/acpi/video_detect.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c index f3f0fe7e255a..b84d4d55182d 100644 --- 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)) { -- 2.39.5