ACPI video: dmi check for broken _BQC on Acer Aspire 5720

On Acer Aspire 5720, _BQC always returns a value 9 smaller than
the actual brightness level.  Add dmi quirk for this laptop.

http://bugzilla.kernel.org/show_bug.cgi?id=13121

Tested-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index cd4fb75..7e8ee49 100644 (file)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -538,6 +538,33 @@ acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
        return -EINVAL;
 }
 
+/*
+ * For some buggy _BQC methods, we need to add a constant value to
+ * the _BQC return value to get the actual current brightness level
+ */
+
+static int bqc_offset_aml_bug_workaround;
+static int __init video_set_bqc_offset(const struct dmi_system_id *d)
+{
+       bqc_offset_aml_bug_workaround = 9;
+       return 0;
+}
+
+static struct dmi_system_id video_dmi_table[] __initdata = {
+       /*
+        * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
+        */
+       {
+        .callback = video_set_bqc_offset,
+        .ident = "Acer Aspire 5720",
+        .matches = {
+               DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
+               DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
+               },
+       },
+       {}
+};
+
 static int
 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
                                        unsigned long long *level)
@@ -557,6 +584,7 @@ acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
                                *level = device->brightness->levels[*level + 2];
 
                        }
+                       *level += bqc_offset_aml_bug_workaround;
                        device->brightness->curr = *level;
                        return 0;
                } else {
@@ -2287,6 +2315,8 @@ EXPORT_SYMBOL(acpi_video_register);
 
 static int __init acpi_video_init(void)
 {
+       dmi_check_system(video_dmi_table);
+
        if (intel_opregion_present())
                return 0;