Example: ac97/realtek_alc655/asus_a8ne_fm_s_ac97_powerup.sr The ac97 PD expects "BIT_CLK", the .sr channel is named "BIT-CLK" and the auto-assignment won't be performed currently. In most cases I'd assume the user would want to have this auto-assignment to happen in such cases. The same probably goes for other, similar cases, i.e. space/tab/-/_ and possibly more should all be treated as being equal for auto-assignment purposes.
Fixed in c526a8fd78952bedc767f64009e0511b2f940f75, thanks!