From: Hans de Goede hdegoede@redhat.com
commit ad75bd85b1db69c97eefea07b375567821f6ef58 upstream.
The 0x153 version of the kbd backlight control SNC handle has no separate address to probe if the backlight is there.
This turns the probe call into a set keyboard backlight call with a value of 0 turning off the keyboard backlight.
Skip probing when there is no separate probe address to avoid this.
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1583752 Fixes: 800f20170dcf ("Keyboard backlight control for some Vaio Fit models") Signed-off-by: Hans de Goede hdegoede@redhat.com Reviewed-by: Mattia Dongili malattia@linux.it Link: https://lore.kernel.org/r/20221213122943.11123-1-hdegoede@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/platform/x86/sony-laptop.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-)
--- a/drivers/platform/x86/sony-laptop.c +++ b/drivers/platform/x86/sony-laptop.c @@ -1892,14 +1892,21 @@ static int sony_nc_kbd_backlight_setup(s break; }
- ret = sony_call_snc_handle(handle, probe_base, &result); - if (ret) - return ret; + /* + * Only probe if there is a separate probe_base, otherwise the probe call + * is equivalent to __sony_nc_kbd_backlight_mode_set(0), resulting in + * the keyboard backlight being turned off. + */ + if (probe_base) { + ret = sony_call_snc_handle(handle, probe_base, &result); + if (ret) + return ret;
- if ((handle == 0x0137 && !(result & 0x02)) || - !(result & 0x01)) { - dprintk("no backlight keyboard found\n"); - return 0; + if ((handle == 0x0137 && !(result & 0x02)) || + !(result & 0x01)) { + dprintk("no backlight keyboard found\n"); + return 0; + } }
kbdbl_ctl = kzalloc(sizeof(*kbdbl_ctl), GFP_KERNEL);