From: Kai Heng Feng <kai.heng.f...@canonical.com>
[ Upstream commit 1b1ffc57a1b2edf58e803e463980b326765a237f ]
Dell Latitude 3160 does not have keyboard backlight, but there is a
sysfs interface for it, which does nothing at all.
KBD_LED_ON_TOKEN is the only token can be found. Since it doesn't have
KBD_LED_OFF_TOKEN or KBD_LED_AUTO_*_TOKEN, it should be safe to assume
at least two tokens should be present to support keyboard backlight.
Not all models have ON token - they may have multiple AUTO tokens instead.
Models which do not use SMBIOS token to control keyboard backlight, also
have this issue. Brightness level is 0 on these models. Verified on Dell
Reports keyboard backlight is supported only when at least two modes are
Signed-off-by: Kai-Heng Feng <kai.heng.f...@canonical.com>
Reviewed-by: Pali Rohár <pali.ro...@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
drivers/platform/x86/dell-laptop.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/x86/dell-laptop.c
index aaeeae81e3a9..c6e5ca2b8ae9 100644
@@ -1608,7 +1608,11 @@ static void kbd_init(void)
ret = kbd_init_info();
- if (kbd_token_bits != 0 || ret == 0)
+ * Only supports keyboard backlight when it has at least two modes.
+ if ((ret == 0 && (kbd_info.levels != 0 || kbd_mode_levels_count >= 2))
+ || kbd_get_valid_token_counts() >= 2)
kbd_led_present = true;