Here is what dmesg shows now:
Fn+F4 [ 90.603608] lenovo_raw_event data 0x1:0x0:0x0 [ 90.603611] report id/type/app: 3223070016/1/0 maxfield: 786433 [ 90.603612] field 0 hid usage hid: 0x0c0000 index 0x000000
Fn+F10 [ 95.779641] lenovo_raw_event data 0x1:0x0:0x0 [ 95.779652] report id/type/app: 3223070016/1/0 maxfield: 786433 [ 95.779670] field 0 hid usage hid: 0x0c0000 index 0x000000
Here is what dmesg shows now:
Fn+F4
[ 90.603608] lenovo_raw_event data 0x1:0x0:0x0
[ 90.603611] report id/type/app: 3223070016/1/0 maxfield: 786433
[ 90.603612] field 0 hid usage hid: 0x0c0000 index 0x000000
Fn+F10
[ 95.779641] lenovo_raw_event data 0x1:0x0:0x0
[ 95.779652] report id/type/app: 3223070016/1/0 maxfield: 786433
[ 95.779670] field 0 hid usage hid: 0x0c0000 index 0x000000