I think tpctl needs APM
APM and ACPI are mutually exclusive so you might need to replace tpctl with something that can use ACPI instead.
i installed knoppix 3.3 into my system (IBM Thinkpad R40e), and then upgrade the kernel into 2.4.23 (with ACPI support), but after upgrading, the special buttons do not work anymore (for examples: button combinations for brightness, volume, LCD off). Those buttons worked when I still use the original version, i.e. before upgrading the kernel to allow ACPI support.
as far as i know, those buttons are controlled by tpctl package (and this is actually included in Knoppix).
I saw that tpctl is started when my system is bringing up. what could be the problem?
I think tpctl needs APM
APM and ACPI are mutually exclusive so you might need to replace tpctl with something that can use ACPI instead.

GIGABYTE A520M DS3H AC AMD AM4 Motherboard mATX
$59.99
Intel H310 LGA1151 8-9th Gen DDR4 M.2 NVMe mATX Motherboard IO Shield Battery
$54.99
ASUS PRIME Z490-V Motherboard Intel Z490 10th gen DDR4 LGA 1200 ATX w/ IO Shield
$84.99
GIGABYTE Z790 AORUS ELITE AX LGA 1700 Intel Z790 ATX Motherboard with DDR5
$189.99
GIGABYTE B365 HD3 LGA1151 Intel 9th Gen motherboard
$59.99
MSI B550M PRO-VDH Micro-ATX Motherboard - AMD AM4, Ryzen 5000/4000/3000 Ready, P
$71.49
MSI - B550M PRO-VDH WIFI (Socket AM4) AMD B550 MATX DDR4 Wi-Fi 6 Motherboard ...
$89.99
ASUS PRIME B360M-C MicroATX Intel LGA1151 DDR4 HDMI VGA USB RJ-45 Audio
$34.99
ASUS B85M-G / B85M-G PLUS LGA1150 DDR3 Micro ATX Motherboard HDMI Support 4thCPU
$45.00
Asus ROG Strix B460-H LGA 1200 ATX Intel 10th Gen DDR4 Motherboard
$84.99