Trackpad no longer works after kernel update to 5.14.21-150500.55.49-default.
Machine is a late 2008 Macbook. Currently loading kernel
5.14.21-150500.55.44-default to get trackpad to work as expected.
Results from dmesg | egrep -i "input|firmware":
[ 0.679475] acpi PNP0A08:00: [Firmware Info]: MMCONFIG for domain 0000 [bus
00-3f] only partially covers this bridge
[ 4.628157] input: Lid Switch as
/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0D:00/input/input0
[ 4.644459] input: Power Button as
/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input1
[ 4.644657] input: Sleep Button as
/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0E:00/input/input2
[ 4.644887] input: Power Button as
/devices/LNXSYSTM:00/LNXPWRBN:00/input/input3
[ 6.172847] input: Apple Computer, Inc. IR Receiver as
/devices/pci0000:00/0000:00:04.0/usb3/3-5/3-5:1.0/0003:05AC:8242.0001/input/input4
[ 6.233339] appleir 0003:05AC:8242.0001: input,hiddev96,hidraw0: USB HID
v1.11 Device [Apple Computer, Inc. IR Receiver] on usb-0000:00:04.0-5/input0
[ 6.554826] input: HID 05ac:820a as
/devices/pci0000:00/0000:00:06.0/usb4/4-1/4-1.2/4-1.2:1.0/0003:05AC:820A.0002/input/input5
[ 6.618303] hid-generic 0003:05AC:820A.0002: input,hidraw1: USB HID v1.11
Keyboard [HID 05ac:820a] on usb-0000:00:06.0-1.2/input0
[ 6.850230] input: HID 05ac:820b as
/devices/pci0000:00/0000:00:06.0/usb4/4-1/4-1.3/4-1.3:1.0/0003:05AC:820B.0003/input/input6
[ 6.850398] hid-generic 0003:05AC:820B.0003: input,hidraw2: USB HID v1.11
Mouse [HID 05ac:820b] on usb-0000:00:06.0-1.3/input0
[ 6.948510] input: Apple, Inc. Apple Internal Keyboard / Trackpad as
/devices/pci0000:00/0000:00:04.0/usb3/3-6/3-6:1.0/0003:05AC:0236.0004/input/input7
[ 7.009804] apple 0003:05AC:0236.0004: input,hidraw3: USB HID v1.11 Keyboard
[Apple, Inc. Apple Internal Keyboard / Trackpad] on usb-0000:00:04.0-6/input0
[ 7.010047] apple 0003:05AC:0236.0005: hidraw4: USB HID v1.11 Device [Apple,
Inc. Apple Internal Keyboard / Trackpad] on usb-0000:00:04.0-6/input1
[ 35.226254] input: PC Speaker as /devices/platform/pcspkr/input/input8
[ 35.865663] input: applesmc as /devices/platform/applesmc.768/input/input9
[ 40.057505] snd_hda_codec_realtek hdaudioC0D0: inputs:
[ 40.180773] input: HDA Digital PCBeep as
/devices/pci0000:00/0000:00:08.0/sound/card0/input10
[ 40.180869] input: HDA NVidia Mic as
/devices/pci0000:00/0000:00:08.0/sound/card0/input11
[ 40.180952] input: HDA NVidia Line as
/devices/pci0000:00/0000:00:08.0/sound/card0/input12
[ 40.181029] input: HDA NVidia Headphone as
/devices/pci0000:00/0000:00:08.0/sound/card0/input13
[ 59.031346] input: bcm5974 as
/devices/pci0000:00/0000:00:04.0/usb3/3-6/3-6:1.2/input/input14
[ 59.582526] input: Built-in iSight: Built-in iSigh as
/devices/pci0000:00/0000:00:04.1/usb1/1-4/1-4:1.0/input/input15
[ 1559.305183] nouveau 0000:02:00.0: Direct firmware load for
nouveau/nvac_fuc084 failed with error -2
[ 1559.305214] nouveau 0000:02:00.0: Direct firmware load for
nouveau/nvac_fuc084d failed with error -2
[ 1559.305218] nouveau 0000:02:00.0: msvld: unable to load firmware data
Please let me know if more information is needed.