6.1-stable review patch. If anyone has any objections, please let me know.
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From: Hans de Goede hdegoede@redhat.com
commit a5b92be2482e5f9ef30be4e4cda12ed484381493 upstream.
Older Asus laptops change the backlight level themselves and then send WMI events with different codes for different backlight levels.
The asus-wmi.c code maps the entire range of codes reported on brightness down keypresses to an internal ASUS_WMI_BRN_DOWN code:
define NOTIFY_BRNUP_MIN 0x11 define NOTIFY_BRNUP_MAX 0x1f define NOTIFY_BRNDOWN_MIN 0x20 define NOTIFY_BRNDOWN_MAX 0x2e
if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX) code = ASUS_WMI_BRN_UP; else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX) code = ASUS_WMI_BRN_DOWN;
This mapping is causing issues on new laptop models which actually send 0x2b events for printscreen presses and 0x2c events for capslock presses, which get translated into spurious brightness-down presses.
This mapping is really only necessary when asus-wmi has registered a backlight-device for backlight control. In this case the mapping was used to decide to filter out the keypresss since in this case the firmware has already modified the brightness itself and instead of reporting a keypress asus-wmi will just report the new brightness value to userspace.
OTOH when the firmware does not adjust the brightness itself then it seems to always report 0x2e for brightness-down presses and 0x2f for brightness up presses independent of the actual brightness level. So in this case the mapping of the code is not necessary and this translation actually leads to spurious brightness-down presses being send to userspace when pressing printscreen or capslock.
Modify asus_wmi_handle_event_code() to only do the mapping when using asus-wmi backlight control to fix the spurious brightness-down presses.
Reported-by: James John me@donjajo.com Closes: https://lore.kernel.org/platform-driver-x86/a2c441fe-457e-44cf-a146-0ecd86b0... Closes: https://bbs.archlinux.org/viewtopic.php?pid=2123716 Signed-off-by: Hans de Goede hdegoede@redhat.com Link: https://lore.kernel.org/r/20231017090725.38163-3-hdegoede@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/platform/x86/asus-wmi.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-)
--- a/drivers/platform/x86/asus-wmi.c +++ b/drivers/platform/x86/asus-wmi.c @@ -3268,7 +3268,6 @@ static void asus_wmi_handle_event_code(i { unsigned int key_value = 1; bool autorelease = 1; - int orig_code = code;
if (asus->driver->key_filter) { asus->driver->key_filter(asus->driver, &code, &key_value, @@ -3277,16 +3276,10 @@ static void asus_wmi_handle_event_code(i return; }
- if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX) - code = ASUS_WMI_BRN_UP; - else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX) - code = ASUS_WMI_BRN_DOWN; - - if (code == ASUS_WMI_BRN_DOWN || code == ASUS_WMI_BRN_UP) { - if (acpi_video_get_backlight_type() == acpi_backlight_vendor) { - asus_wmi_backlight_notify(asus, orig_code); - return; - } + if (acpi_video_get_backlight_type() == acpi_backlight_vendor && + code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNDOWN_MAX) { + asus_wmi_backlight_notify(asus, code); + return; }
if (code == NOTIFY_KBD_BRTUP) {