# \[PATCH 6/6\] btbcm: disable read tx power for iMac 20,2 (Retina 5K, 27-inch, 2020)

- From: Aditya Garg \<hidden\>
- Date: 2021-11-29 07:34:38 
- List: linux-bluetooth
- Page: https://ratatoskr.run/linux-bluetooth/2021/11/1589249
- Thread: https://ratatoskr.run/linux-bluetooth/2021/09/9681711/t.md

```text
From: Aditya Garg <redacted>

Bluetooth on Apple iMac 20,2 is unable to start due to LE Min/Max Tx Power being queried on startup. Add a DMI based quirk so that it is disabled.

Signed-off-by: Aditya Garg <redacted>
---
 drivers/bluetooth/btbcm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/bluetooth/btbcm.c b/drivers/bluetooth/btbcm.c
index 15c5be927c659..601337b5a5130 100644
--- a/drivers/bluetooth/btbcm.c
+++ b/drivers/bluetooth/btbcm.c
@@ -381,6 +381,15 @@ static const struct dmi_system_id disable_broken_read_transmit_power[] = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "iMac20,1"),
 		},
 	},
+	{
+		/* Match for Apple iMac 20,2 which needs
+		 * Read LE Min/Max Tx Power to be disabled.
+		 */
+		 .matches = {
+			DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "iMac20,2"),
+		},
+	},
 	{ }
 };
 

```