From: Hans de Goede hdegoede@redhat.com
[ Upstream commit 5ad26161a371e4aa2d2553286f0cac580987a493 ]
Commit 3a0cf7ab8df3 ("ACPI: video: Change how we determine if brightness key-presses are handled") made acpi_video_handles_brightness_key_presses() report false when none of the ACPI Video Devices support backlight control.
But it turns out that at least on a Dell Inspiron N4010 there is no ACPI backlight control, yet brightness hotkeys are still reported through the ACPI Video Bus; and since acpi_video_handles_brightness_key_presses() now returns false, brightness keypresses are now reported twice.
To fix this rename the has_backlight flag to may_report_brightness_keys and also set it the first time a brightness key press event is received.
Depending on the delivery of the other ACPI (WMI) event vs the ACPI Video Bus event this means that the first brightness key press might still get reported twice, but all further keypresses will be filtered as before.
Note that this relies on other drivers reporting brightness key events calling acpi_video_handles_brightness_key_presses() when delivering the events (rather then once during driver probe). This is already required and documented in include/acpi/video.h:
/* * Note: The value returned by acpi_video_handles_brightness_key_presses() * may change over time and should not be cached. */
Fixes: 3a0cf7ab8df3 ("ACPI: video: Change how we determine if brightness key-presses are handled") Link: https://lore.kernel.org/regressions/CALF=6jEe5G8+r1Wo0vvz4GjNQQhdkLT5p8uCHn6... Reported-and-tested-by: Ben Greening bgreening@gmail.com Signed-off-by: Hans de Goede hdegoede@redhat.com Acked-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Link: https://lore.kernel.org/r/20220713211101.85547-2-hdegoede@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/acpi_video.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
--- a/drivers/acpi/acpi_video.c +++ b/drivers/acpi/acpi_video.c @@ -73,7 +73,7 @@ module_param(device_id_scheme, bool, 044 static int only_lcd = -1; module_param(only_lcd, int, 0444);
-static bool has_backlight; +static bool may_report_brightness_keys; static int register_count; static DEFINE_MUTEX(register_count_mutex); static DEFINE_MUTEX(video_list_lock); @@ -1224,7 +1224,7 @@ acpi_video_bus_get_one_device(struct acp acpi_video_device_find_cap(data);
if (data->cap._BCM && data->cap._BCL) - has_backlight = true; + may_report_brightness_keys = true;
mutex_lock(&video->device_list_lock); list_add_tail(&data->entry, &video->video_device_list); @@ -1693,6 +1693,9 @@ static void acpi_video_device_notify(acp break; }
+ if (keycode) + may_report_brightness_keys = true; + acpi_notifier_call_chain(device, event, 0);
if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { @@ -2254,7 +2257,7 @@ void acpi_video_unregister(void) if (register_count) { acpi_bus_unregister_driver(&acpi_video_bus); register_count = 0; - has_backlight = false; + may_report_brightness_keys = false; } mutex_unlock(®ister_count_mutex); } @@ -2276,7 +2279,7 @@ void acpi_video_unregister_backlight(voi
bool acpi_video_handles_brightness_key_presses(void) { - return has_backlight && + return may_report_brightness_keys && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); } EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);