diff options
Diffstat (limited to 'acpi-video-Allow-forcing-native-backlight-on-non-win.patch')
| -rw-r--r-- | acpi-video-Allow-forcing-native-backlight-on-non-win.patch | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/acpi-video-Allow-forcing-native-backlight-on-non-win.patch b/acpi-video-Allow-forcing-native-backlight-on-non-win.patch new file mode 100644 index 000000000..2e6627be3 --- /dev/null +++ b/acpi-video-Allow-forcing-native-backlight-on-non-win.patch @@ -0,0 +1,73 @@ +From: Aaron Lu <aaron.lu@intel.com> +Date: Wed, 11 Mar 2015 14:14:56 +0800 +Subject: [PATCH] acpi: video: Allow forcing native backlight on non win8 + machines + +The native backlight behavior (so not registering both the acpi-video +and the vendor backlight driver) can be useful on some non win8 machines +too, so change the behavior of the video.use_native_backlight=1 or 0 +kernel cmdline option to be: if user has set video.use_native_backlight=1 +or 0, use that no matter if it is a win8 system or not. Also, we will +put some known systems into the DMI table to make them either use native +backlight interface or not, and the use_native_backlight_dmi is used to +reflect that. + +Original-by: Hans de Goede <hdegoede@redhat.com> +Signed-off-by: Aaron Lu <aaron.lu@intel.com> +Acked-by: Hans de Goede <hdegoede@redhat.com> +Signed-off-by: Hans de Goede <hdegoede@redhat.com> +--- + drivers/acpi/video.c | 19 +++++++++++++------ + 1 file changed, 13 insertions(+), 6 deletions(-) + +diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c +index db70d550f526..70ea37bea84f 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 +421,7 @@ 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; + } + |