Then to check if it is a hardware issue I booted from live ubuntu 19.04 and tried to use bluetooth. In that case my bluetooth worked perfectly. Then when I booted from my debian system again in my surprise I noticed that now my bluetooth is working without any problem!
After rebooting, again my bluetooth device is lost! I can't find any hci device in my debian system. Why is this happening?
Here are some information about my system and relevant command outputs when bluetooth device isn't found:
$ cat /etc/os-release
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PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
NAME="Debian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
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00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C216 Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C216 Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C216 Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 2 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM76 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C216 Chipset Family SMBus Controller (rev 04)
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller (rev 05)
02:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01)
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bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2019-07-05 23:18:49 +06; 31min ago
Docs: man:bluetoothd(8)
Main PID: 2240 (bluetoothd)
Status: "Running"
Tasks: 1 (limit: 4915)
CGroup: /system.slice/bluetooth.service
└─2240 /usr/lib/bluetooth/bluetoothd
Jul 05 23:18:49 multivac systemd[1]: Starting Bluetooth service...
Jul 05 23:18:49 multivac bluetoothd[2240]: Bluetooth daemon 5.43
Jul 05 23:18:49 multivac systemd[1]: Started Bluetooth service.
Jul 05 23:18:49 multivac bluetoothd[2240]: Starting SDP server
Jul 05 23:18:49 multivac bluetoothd[2240]: Bluetooth management interface 1.14 initialized
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0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
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Devices: