My bluetooth always worked on this Dell XPS 13 but after a power outage it won't work anymore. I think wifi and bluetooth are in the same pcie module but I'm not sure.
On bluetooth settings it says no dongle.
lz@xps13:~$ lspci
0000:00:00.0 Host bridge: Intel Corporation Device 9a14 (rev 01)
0000:00:02.0 VGA compatible controller: Intel Corporation Device 9a49 (rev 01)
0000:00:04.0 Signal processing controller: Intel Corporation Device 9a03 (rev 01)
0000:00:06.0 System peripheral: Intel Corporation Device 09ab
0000:00:07.0 PCI bridge: Intel Corporation Device 9a23 (rev 01)
0000:00:07.2 PCI bridge: Intel Corporation Device 9a27 (rev 01)
0000:00:0a.0 Signal processing controller: Intel Corporation Device 9a0d (rev 01)
0000:00:0d.0 USB controller: Intel Corporation Device 9a13 (rev 01)
0000:00:0d.2 USB controller: Intel Corporation Device 9a1b (rev 01)
0000:00:0d.3 USB controller: Intel Corporation Device 9a1d (rev 01)
0000:00:0e.0 RAID bus controller: Intel Corporation Volume Management Device NVMe RAID Controller
0000:00:12.0 Serial controller: Intel Corporation Device a0fc (rev 20)
0000:00:14.0 USB controller: Intel Corporation Device a0ed (rev 20)
0000:00:14.2 RAM memory: Intel Corporation Device a0ef (rev 20)
0000:00:14.3 Network controller: Intel Corporation Device a0f0 (rev 20)
0000:00:15.0 Serial bus controller [0c80]: Intel Corporation Device a0e8 (rev 20)
0000:00:15.1 Serial bus controller [0c80]: Intel Corporation Device a0e9 (rev 20)
0000:00:16.0 Communication controller: Intel Corporation Device a0e0 (rev 20)
0000:00:19.0 Serial bus controller [0c80]: Intel Corporation Device a0c5 (rev 20)
0000:00:19.1 Serial bus controller [0c80]: Intel Corporation Device a0c6 (rev 20)
0000:00:1c.0 PCI bridge: Intel Corporation Device a0b8 (rev 20)
0000:00:1d.0 PCI bridge: Intel Corporation Device a0b3 (rev 20)
0000:00:1f.0 ISA bridge: Intel Corporation Device a082 (rev 20)
0000:00:1f.3 Multimedia audio controller: Intel Corporation Device a0c8 (rev 20)
0000:00:1f.4 SMBus: Intel Corporation Device a0a3 (rev 20)
0000:00:1f.5 Serial bus controller [0c80]: Intel Corporation Device a0a4 (rev 20)
0000:71:00.0 Network controller: Qualcomm Device 1101 (rev 01)
0000:72:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5260 PCI Express Card Reader (rev 01)
10000:e0:06.0 PCI bridge: Intel Corporation Device 9a09 (rev 01)
10000:e1:00.0 Non-Volatile memory controller: Toshiba Corporation Device 011a
There's nothing about bluetooth on dmesg.
lz@xps13:~$ sudo dmesg | grep -i blue
nothing.
Ubuntu 20.04
uname -r
5.10.0-1023-oem
UPDATE:
after some reboots:
lz@xps13:~$ sudo dmesg | grep -i blue
[sudo] password for lz:
[ 12.090787] Bluetooth: Core ver 2.22
[ 12.090805] Bluetooth: HCI device and connection manager initialized
[ 12.090808] Bluetooth: HCI socket layer initialized
[ 12.090810] Bluetooth: L2CAP socket layer initialized
[ 12.090812] Bluetooth: SCO socket layer initialized
[ 12.165009] Bluetooth: HCI UART driver ver 2.3
[ 12.165011] Bluetooth: HCI UART protocol H4 registered
[ 12.165012] Bluetooth: HCI UART protocol BCSP registered
[ 12.165020] Bluetooth: HCI UART protocol LL registered
[ 12.165021] Bluetooth: HCI UART protocol ATH3K registered
[ 12.165026] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 12.165052] Bluetooth: HCI UART protocol Intel registered
[ 12.165082] Bluetooth: HCI UART protocol Broadcom registered
[ 12.165087] Bluetooth: HCI UART protocol QCA registered
[ 12.165087] Bluetooth: HCI UART protocol AG6XX registered
[ 12.165092] Bluetooth: HCI UART protocol Marvell registered
[ 13.778233] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 13.778235] Bluetooth: BNEP filters: protocol multicast
[ 13.778239] Bluetooth: BNEP socket layer initialized
but I still see no bluetooth in the settings, it says it couldnt find a bluetooth device
Could you try reinstalling the drivers? Maybe a failed update removed them during the session (but they were loading from RAM or cache).
Multiple reboots, driver reinstall and different kernels did not work, but draining the battery and then charging again worked