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If you have an Librem5 and are on kernel 6.6.27, you may have noticed that the modem is disappearing several times a day. There seems to be a regression that we need to track down.
In the mean time, we advise you to not update to 6.6.27. If you have, the 6.1 kernel does not have this issue, and @kop316 is testing if the 6.6.23 kernel has this issue too.
(Note that only folks in staging would have upgraded to 6.6.27, Trixie still has 6.6.23).
It seems like reverting to 6.6.23 fixes the issue.
For anyone following along, the issue was in upstream linux, and the fix can be found here:
https://lore.kernel.org/all/20240423213859.665655626@linuxfoundation.org/
We will apply it to our kernel and can drop it when it is in upstream 6.6.29: https://salsa.debian.org/Mobian-team/devices/kernels/librem5-linux/-/merge_requests/28
We are releasing the fix in staging and it should be available within the hour. Please make sure you upgrade to 6.6.27+librem5-2 if you are in staging (If you were using the trixie repo, no need to do anything!)
EDIT: The fix is in staging now!