Thank you for joining the community.
I see that you are having problems with the Bluetooth devices connected to your system, allow me to help you with the inquiries.
Could you access the device manager and under the view tab select the option to show hidden devices please let me know if you can find your devices under the Bluetooth section.
Could you also complete a clean installation of the driver on your system?
Allow me to share with you the following link for steps to complete the installation:
Hope this help.
Thanks for the support. Using the 'show hidden device' view , the device is not visible anymore.
See enclosed bitmap below.
Install has been made with recommended setup. Do you have an idea on what could make the device disappear ?
I have tested with another mobile (huawei) and get the same result.
Thank you for your response.
I am looking into the situation, you have motioned that you have tested a Huawei device, could you let me the model of the device and also if you have tested any other Bluetooth devices on the system?
Could you also run the Intel® DSA on your system to up complete an update of the drivers?
Intel® DSA download link: https://downloadcenter.intel.com/download/24345/Intel-Driver-Support-Assistant?product=128824.
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Hi f vib
According to the screenshot you also have an external Bluetooth USB device connected. If I remember correctly, if there is an external Bluetooth device connected this will disable the Bluetooth portion of the Intel wireless card and disconnect whatever is paired. I would recommend removing the external portion and try again.
Thanks for the feedback. External Bluetooth is not plugged when Intel wireless is used, anyway I have cleaned it from device manager and made the test again without success. The point is that the Bluetooth instance is always removed after the 2nd reboot , I mean first reboot is ok and the mobile is properly detected by Windows and connection is ok. Is there something in Bluetooth behavior that can produce a bonding removal?
Hello f vib
I have been trying to reproduce the issue you are having with the same configuration and even using a Galaxy S6/S8 phone however the device shows on the Bluetooth list even after several reboots or cold boots. The correct behavior should be to keep all paired devices listed, unless manually gets removed.
Do you have the same issue with other BT device or just those 2 that you mentioned? My feeling is that there could be a security feature from a third party software ( Like the Antivirus ) that might remove specific devices from the list base on a specific criteria. Maybe this is good to check with AV vendor.
Please let me know how it goes.
Thanks for the support. During your tests did you use an Android APP with a GATT server ?
I have two updates on this issue:
1/ I noticed a change between windows 10 1803 and 1709 build regarding bluetooth pairing security ie:
Previously windows 1709 only supported Passkey Pairing mode without LE Secure Connection but now with 1803 LE Secure Connection is supported with Numeric Comparison.
As I suspected something wrong with the security feature LESC, I decided to force Windows to use Passkey pairing mode without LE Secure Connection using a rooted Android smartphone and customized BLE stack parameters.
This trick fixed the issue. I can now reboot indefinitely the PC and pairing data is never lost.
A question now is what's wrong with LESC and how can we move forward to debug the issue?
2/ A second observation then is that if I plug a old BT4.0 dongle from CSR, it also fixes the issue.
Regarding the trail of the antivirus, I think it is perhaps no more relevant.
Hi f vib,
Glad to hear you found a workaround. Let me take this to engineering and let you know.
Are you developing a new product using the Intel Bluetooth portion? Just want to make sure you will get the correct support so I can point you also to the correct support channel.