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Diffstat (limited to 'drivers/acpi/video.c')
-rw-r--r--drivers/acpi/video.c36
1 files changed, 30 insertions, 6 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 26eb70c8f518..cc79d3fedfb2 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -82,9 +82,15 @@ module_param(allow_duplicates, bool, 0644);
* For Windows 8 systems: used to decide if video module
* should skip registering backlight interface of its own.
*/
-static int use_native_backlight_param = -1;
+enum {
+ NATIVE_BACKLIGHT_NOT_SET = -1,
+ NATIVE_BACKLIGHT_OFF,
+ NATIVE_BACKLIGHT_ON,
+};
+
+static int use_native_backlight_param = NATIVE_BACKLIGHT_NOT_SET;
module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
-static bool use_native_backlight_dmi = true;
+static int use_native_backlight_dmi = NATIVE_BACKLIGHT_NOT_SET;
static int register_count;
static struct mutex video_list_lock;
@@ -237,15 +243,16 @@ static void acpi_video_switch_brightness(struct work_struct *work);
static bool acpi_video_use_native_backlight(void)
{
- if (use_native_backlight_param != -1)
+ if (use_native_backlight_param != NATIVE_BACKLIGHT_NOT_SET)
return use_native_backlight_param;
- else
+ else if (use_native_backlight_dmi != NATIVE_BACKLIGHT_NOT_SET)
return use_native_backlight_dmi;
+ return acpi_osi_is_win8();
}
bool acpi_video_verify_backlight_support(void)
{
- if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
+ if (acpi_video_use_native_backlight() &&
backlight_device_registered(BACKLIGHT_RAW))
return false;
return acpi_video_backlight_support();
@@ -414,7 +421,13 @@ static int __init video_set_bqc_offset(const struct dmi_system_id *d)
static int __init video_disable_native_backlight(const struct dmi_system_id *d)
{
- use_native_backlight_dmi = false;
+ use_native_backlight_dmi = NATIVE_BACKLIGHT_OFF;
+ return 0;
+}
+
+static int __init video_enable_native_backlight(const struct dmi_system_id *d)
+{
+ use_native_backlight_dmi = NATIVE_BACKLIGHT_ON;
return 0;
}
@@ -559,6 +572,17 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
},
},
+
+ /* Non win8 machines which need native backlight nevertheless */
+ {
+ /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
+ .callback = video_enable_native_backlight,
+ .ident = "Lenovo Ideapad Z570",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
+ },
+ },
{}
};