diff options
Diffstat (limited to 'drivers/acpi/video.c')
| -rw-r--r-- | drivers/acpi/video.c | 45 |
1 files changed, 43 insertions, 2 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 826884392e6..fcbda105616 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -82,9 +82,9 @@ 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; +static int use_native_backlight_param = -1; module_param_named(use_native_backlight, use_native_backlight_param, int, 0444); -static bool use_native_backlight_dmi = false; +static bool use_native_backlight_dmi = true; static int register_count; static struct mutex video_list_lock; @@ -417,6 +417,12 @@ static int __init video_set_use_native_backlight(const struct dmi_system_id *d) return 0; } +static int __init video_disable_native_backlight(const struct dmi_system_id *d) +{ + use_native_backlight_dmi = false; + return 0; +} + static struct dmi_system_id video_dmi_table[] __initdata = { /* * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 @@ -720,6 +726,41 @@ static struct dmi_system_id video_dmi_table[] __initdata = { DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"), }, }, + + /* + * These models have a working acpi_video backlight control, and using + * native backlight causes a regression where backlight does not work + * when userspace is not handling brightness key events. Disable + * native_backlight on these to fix this: + * https://bugzilla.kernel.org/show_bug.cgi?id=81691 + */ + { + .callback = video_disable_native_backlight, + .ident = "ThinkPad T420", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"), + }, + }, + { + .callback = video_disable_native_backlight, + .ident = "ThinkPad T520", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"), + }, + }, + + /* The native backlight controls do not work on some older machines */ + { + /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */ + .callback = video_disable_native_backlight, + .ident = "HP ENVY 15 Notebook", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"), + }, + }, {} }; |