[SRU][G/aws][PATCH 0/1] fix broken /dev/console on i3.metal
andrea.righi at canonical.com
Thu Sep 24 10:53:20 UTC 2020
Starting with kernel 5.8 the default nr_uarts has been changed from 4 to
2 for amd64, but this seems to affect i3.metal instances in AWS, because
ttyS0 is now remapped to ttyS4 and this is breaking tools like
cloud-init (and probably something else).
# echo > /dev/console
bash: echo: write error: Input/output error
Setting nr_uarts=4 by default (via CONFIG_SERIAL_8250_RUNTIME_UARTS)
restores the previous behavior and writing to /dev/console works without
returning any error.
Minimal. Restores the old behavior used in 5.4 (that shouldn't have
changed in the first place).
More information about the kernel-team