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faq.md: Document thinkpad_acpi issue on haswell

hslick-master
Leah Rowe 2023-03-04 22:52:11 +00:00
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@ -708,6 +708,32 @@ What does a flash chip look like?
You can find photos of various chip types on the following page:\
[External 25xx NOR flashing guide](docs/install/spi.md)
Inability to modprobe thinkpad\_acpi on Haswell
===============================================
This was reported by a user, running Debian 11 with
kernel `5.19.0-0.deb11.2-amd64`. This may not be a problem on all Libreboot
versions. The `thinkpad_acpi` module was not loading, with the following
message in `dmesg`:
```
modprobe: ERROR: could not insert 'thinkpad_acpi': "No such device"
```
Battery info in `/sys` was absent, because of this. The user reported that
the following workaround was effective (in Debian).
Add this line to `/etc/modprobe.d/thinkpad_acpi.conf`:
```
options thinkpad_acpi force_load=1
```
TODO: test on latest lbmk revisions, after the update to coreboot revisions
from February 2023 for Haswell boards. This issue was reported on Libreboot
20221214, which was based on a much older revision of coreboot for those
mainboards.
What other firmware exists outside of libreboot?
==================================================