Yes, in the Intel® Quartus® Prime Pro Edition software version 21.1, the behavior of the PWRMGT_ALERT signal in the handshake flow for Intel® Stratix® 10 / Intel® Agilex™ Smart VID PMBus Slave Mode has been changed.
This signal will be asserted in the first configuration cycle to inform the PMBUS master that a voltage change is required.
If you perform a second or subsequent configuration without a power cycle, the PWRMGT_ALERT signal will not be asserted if the bitstream has the same VID setting specified in the Intel Quartus Prime project and the same configuration firmware.
The PWRMGT_ALERT signal will still be asserted when there is any I2C/PMBus error. It will not be asserted during Partial Reconfiguration.
Starting with the Intel® Quartus® Prime Pro Edition software version 21.2, the PWRMGT_ALERT signal will be asserted for the first configuration and subsequent configuration as per behavior prior in the Intel® Quartus® Prime Pro Edition software version 20.4 and earlier.
Ensure the PMBus master adheres to the latest handshake flow available in the Intel® Stratix® 10/Intel® Agilex™ Power Management User Guide