Instead of using directly acpi_video_unregister(), use
acpi_video_dmi_promote_vendor() (and make it call
acpi_video_unregister() if needed)

Signed-off-by: Corentin Chary <[email protected]>
---
 drivers/platform/x86/acer-wmi.c       |   11 ++++-------
 drivers/platform/x86/apple-gmux.c     |    2 ++
 drivers/platform/x86/samsung-laptop.c |   22 ++++++++++++----------
 3 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index c1a3fd8..a3f2f1b 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -2036,14 +2036,11 @@ static int __init acer_wmi_init(void)
 
        set_quirks();
 
+       if (dmi_check_system(video_vendor_dmi_table))
+               acpi_video_dmi_promote_vendor();
        if (acpi_video_backlight_support()) {
-               if (dmi_check_system(video_vendor_dmi_table)) {
-                       acpi_video_unregister();
-               } else {
-                       interface->capability &= ~ACER_CAP_BRIGHTNESS;
-                       pr_info("Brightness must be controlled by "
-                               "acpi video driver\n");
-               }
+               interface->capability &= ~ACER_CAP_BRIGHTNESS;
+               pr_info("Brightness must be controlled by acpi video driver\n");
        }
 
        if (wmi_has_guid(WMID_GUID3)) {
diff --git a/drivers/platform/x86/apple-gmux.c 
b/drivers/platform/x86/apple-gmux.c
index 6dcef4f..39e047d 100644
--- a/drivers/platform/x86/apple-gmux.c
+++ b/drivers/platform/x86/apple-gmux.c
@@ -193,6 +193,7 @@ static int __devinit gmux_probe(struct pnp_dev *pnp,
         * backlight control and supports more levels than other options.
         * Disable the other backlight choices.
         */
+       acpi_video_dmi_promote_vendor();
        acpi_video_unregister();
        apple_bl_unregister();
 
@@ -213,6 +214,7 @@ static void __devexit gmux_remove(struct pnp_dev *pnp)
        release_region(gmux_data->iostart, gmux_data->iolen);
        kfree(gmux_data);
 
+       acpi_video_dmi_demote_vendor();
        acpi_video_register();
        apple_bl_register();
 }
diff --git a/drivers/platform/x86/samsung-laptop.c 
b/drivers/platform/x86/samsung-laptop.c
index e2a34b4..2cbccc1 100644
--- a/drivers/platform/x86/samsung-laptop.c
+++ b/drivers/platform/x86/samsung-laptop.c
@@ -26,7 +26,7 @@
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
 #include <linux/ctype.h>
-#if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
+#ifdef CONFIG_ACPI_VIDEO
 #include <acpi/video.h>
 #endif
 
@@ -1530,15 +1530,18 @@ static int __init samsung_init(void)
        samsung->quirks = quirks;
 
 
-#if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
+#ifdef CONFIG_ACPI
+       if (samsung->quirks->broken_acpi_video)
+               acpi_video_dmi_promote_vendor();
+
        /* Don't handle backlight here if the acpi video already handle it */
        if (acpi_video_backlight_support()) {
-               if (samsung->quirks->broken_acpi_video) {
-                       pr_info("Disabling ACPI video driver\n");
-                       acpi_video_unregister();
-               } else {
-                       samsung->handle_backlight = false;
-               }
+               samsung->handle_backlight = false;
+       } else if (samsung->quirks->broken_acpi_video) {
+               pr_info("Disabling ACPI video driver\n");
+#ifdef CONFIG_ACPI_VIDEO
+               acpi_video_unregister();
+#endif
        }
 #endif
 
@@ -1552,8 +1555,7 @@ static int __init samsung_init(void)
 
 #ifdef CONFIG_ACPI
        /* Only log that if we are really on a sabi platform */
-       if (acpi_video_backlight_support() &&
-           !samsung->quirks->broken_acpi_video)
+       if (acpi_video_backlight_support())
                pr_info("Backlight controlled by ACPI video driver\n");
 #endif
 
-- 
1.7.9.5

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