tx)
 {
 	device_t dev = iflib_get_dev(ctx);
 	struct igc_softc *sc = iflib_get_softc(ctx);
 	int cap;
-	uint32_t ctl1;
+	uint32_t ctl1, mask;
 
-	if (!igc_is_device_id_i226(&sc->hw))
+	if (igc_is_device_id_i225(&sc->hw))
+		mask = PCIM_L1PM_CTL1_ASPM_L1_2 |
+		    PCIM_L1PM_CTL1_PCIPM_L1_2;
+	else if (igc_is_device_id_i226(&sc->hw))
+		mask = PCIM_L1PM_CTL1_ASPM_L1_2;
+	else
 		return;
 
 	if (pci_find_extcap(dev, PCIZ_L1PM, &cap) != 0)
 		return;
 
 	ctl1 = pci_read_config(dev, cap + PCIR_L1PM_CTL1, 4);
-	ctl1 &= ~PCIM_L1PM_CTL1_ASPM_L1_2;
+	ctl1 &= ~mask;
 	pci_write_config(dev, cap + PCIR_L1PM_CTL1, ctl1, 4);
 }
 
diff --git a/sys/dev/igc/igc_base.c b/sys/dev/igc/igc_base.c
index e3ab9733009f..510f4c132b9a 100644
--- a/sys/dev/igc/igc_base.c
+++ b/sys/dev/igc/igc_base.c
@@ -185,6 +185,35 @@ void igc_rx_fifo_flush_base(struct igc_hw *hw)
 	IGC_READ_REG(hw, IGC_MPC);
 }
 
+/**
+ *  igc_is_device_id_i225 - Check whether the device is I225 silicon
+ *  @hw: pointer to the HW structure
+ *
+ *  I225 and I226 share the same mac.type, so this checks the PCI
+ *  device ID directly to distinguish I225 parts, e.g. for erratum
+ *  workarounds that apply only to that silicon.
+ *
+ *  I225_BLANK_NVM is absent from the equivalent Linux helper.  I220 is
+ *  kept separate because Intel's I225 specification update does not
+ *  identify it as affected.
+ **/
+bool igc_is_device_id_i225(struct igc_hw *hw)
+{
+	switch (hw->device_id) {
+	case IGC_DEV_ID_I225_LM:
+	case IGC_DEV_ID_I225_V:
+	case IGC_DEV_ID_I225_K:
+	case IGC_DEV_ID_I225_I:
+	case IGC_DEV_ID_I225_K2:
+	case IGC_DEV_ID_I225_LMVP:
+	case IGC_DEV_ID_I225_IT:
+	case IGC_DEV_ID_I225_BLANK_NVM:
+		return true;
+	default:
+		return false;
+	}
+}
+
 /**
  *  igc_is_device_id_i226 - Check whether the device is I226 silicon
  *  @hw: pointer to the HW structure
diff --git a/sys/dev/igc/igc_base.h b/sys/dev/igc/igc_base.h
index 91cb602f809d..26344330ffed 100644
--- a/sys/dev/igc/igc_base.h
+++ b/sys/dev/igc/igc_base.h
@@ -13,6 +13,7 @@ void igc_power_down_phy_copper_base(struct igc_hw *hw);
 extern void igc_rx_fifo_flush_base(struct igc_hw *hw);
 s32 igc_acquire_phy_base(struct igc_hw *hw);
 void igc_release_phy_base(struct igc_hw *hw);
+bool igc_is_device_id_i225(struct igc_hw *hw);
 bool igc_is_device_id_i226(struct igc_hw *hw);
 
 /* Transmit Descriptor - Advanced */