将 Ubuntu 18.04 升级到 20.04 后，我现在无法加载thinkpad_ac模块（这是传递性要求的tp_smapi）：
[ 4245.656402] thinkpad_ec: thinkpad_ec_request_row: arg0 rejected: (0x01:0x00)->0x00
[ 4245.656404] thinkpad_ec: thinkpad_ec_read_row: failed requesting row: (0x01:0x00)->0xfffffffb
[ 4245.656406] thinkpad_ec: initial ec test failed
这是在联想 ThinkPad T480s 上。没有tp_smapi加载，tlp不再允许我更改充电限制。
如何重新启用tp_smapi及其所有传递依赖项，以便tlp再次工作？
在我的 Ubuntu 18.04 机器上加载期间，所有 DKMS 管理的内核模块都开始失败。我注意到了它，acpi_call所以让我用它来演示：
# uname -r
4.15.0-99-generic
# modinfo acpi_call.ko
filename: /lib/modules/4.15.0-99-generic/updates/dkms/acpi_call.ko
license: GPL
srcversion: 72B6FB9451F0D2139482F11
depends:
retpoline: Y
name: acpi_call
vermagic: 4.15.0-99-generic SMP mod_unload
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
# modprobe acpi_call
modprobe: ERROR: could not insert 'acpi_call': Exec format error
我尝试使用 DKMS 重新安装它，但无济于事：
# dkms status acpi-call
acpi-call, 1.1.0, 4.15.0-99-generic, x86_64: installed
# dkms remove acpi-call/1.1.0 --all
-------- Uninstall Beginning --------
Module: acpi-call
Version: 1.1.0
Kernel: 4.15.0-99-generic (x86_64)
-------------------------------------
Status: Before uninstall, this module version was ACTIVE on this kernel.
acpi_call.ko:
- Uninstallation
- Deleting from: /lib/modules/4.15.0-99-generic/updates/dkms/
- Original module
- No original module was found for this module on this kernel.
- Use the dkms install command to reinstall any previous module version.
depmod...
DKMS: uninstall completed.
------------------------------
Deleting module version: 1.1.0
completely from the DKMS tree.
------------------------------
Done.
# dkms install acpi-call/1.1.0
Creating symlink /var/lib/dkms/acpi-call/1.1.0/source ->
/usr/src/acpi-call-1.1.0
DKMS: add completed.
Kernel preparation unnecessary for this kernel. Skipping...
Building module:
cleaning build area...
make -j8 KERNELRELEASE=4.15.0-99-generic -C /lib/modules/4.15.0-99-generic/build M=/var/lib/dkms/acpi-call/1.1.0/build...
Signing module:
- /var/lib/dkms/acpi-call/1.1.0/4.15.0-99-generic/x86_64/module/acpi_call.ko
Nothing to do.
cleaning build area...
DKMS: build completed.
acpi_call.ko:
Running module version sanity check.
- Original module
- No original module exists within this kernel
- Installation
- Installing to /lib/modules/4.15.0-99-generic/updates/dkms/
depmod...
DKMS: install completed.
# modprobe acpi_call
modprobe: ERROR: could not insert 'acpi_call': Exec format error
中的其他模块/lib/modules/4.15.0-99-generic/updates/dkms表现出完全相同的问题。
我也试过modprobe -f，导致不同的错误信息：
# modprobe -f acpi_call
modprobe: ERROR: could not insert 'acpi_call': Required key not available
这使我陷入了MOK 兔子洞，但即使在注册了新的 MOK 并sign-file-ing.ko文件之后，我仍然收到Required key not available错误消息。如果我禁用验证，那么modprobe -f仍然会失败并显示Exec format error.
另外，我注意到这一行dmesg：
[ 617.320431] module: x86/modules: Skipping invalid relocation target, existing value is nonzero for type 1, loc 0000000057734886, val ffffffffc0d56a43
这里出了什么问题，我该如何解决？