Bluetooth should resume working after the laptop has resumed and the wireless switch is positioned to enable wireless devices.
Laptop resumed from suspend and wireless devices enabled with the hardware switch on the right side of the laptop, but Bluetooth does not work. Wi-Fi works as expected. GNOME Settings infers the laptop does not have a Bluetooth device
rfkill list shows
0: phy0: Wireless LAN
Soft Blocked: no
Hard Blocked: no
No mention of Bluetooth
lsmod | grep bluetooth shows
bluetooth 626688 12 btrtl, btintel, btbcm, bnep, ath3k, btusb
ecdh_generic 24576 1 bluetooth
rfkill 28672 6 bluetooth, cfg80211
crc16 16384 2 bluetooth, ext4
systemctl status bluetooth shows the service is active (running)
Perusing through journalctl shows the following errors, not all of them are relevant to this issue:
kernel: i915 0000:00:02.0: firmware: failed to load i915/skl_dmc_ver1_27.bin (-2)
kernel: firmware_class: See https://wiki.debian.org/Firmware for information about missing firmware
kernel: usb 1-6: firmware: failed to load ark3k/AthrBT_0x11020110.dfu (-2)
kernel: Bluetooth: Loading patch file failed
ntpd: error resolving pool 2.debian.pool.ntp.org: Name or service not known (-2)
ntpd: error resolving pool 3.debian.pool.ntp.org: Name or service not known (-2)
spice-vdagent: Cannot access vdagent virtio channel /dev/virtio-ports/com.redhat.spice.0
Bluetooth no longer functions, even after cold boot.
During my last login while Bluetooth did function as expected, I did perform an update. This was two or three days ago.