The modaliases describe the hardware and are used to resolve kmps and driver
packages supplementing the system. Assuming the hardware does not change that
often, you can manually collect them. Maybe better than turning them off
completely:
> find /sys/ -type f -name modalias -print0 | xargs -0 cat | sort -u >/tmp/modaliases
> ZYPP_MODALIAS_SYSFS=/tmp/modaliases