I can confirm that 4.19 mainline kernel has got the error:
Linux xxx 4.19.114-0419114-generic #202004021037 SMP Thu Apr 2 14:42:12 UTC
2020 x86_64 x86_64 x86_64 GNU/Linux
hcitool lescan
Set scan parameters failed: Input/output error
@ RAW Open: hcitool (privileged) version 2.22
{0x0004} [hci0] 20:54:57.660407
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7
#1 [hci0] 20:54:57.660419
Type: Active (0x01)
Interval: 10.000 msec (0x0010)
Window: 10.000 msec (0x0010)
Own address type: Public (0x00)
Filter policy: Accept all advertisement (0x00)
> HCI Event: Command Complete (0x0e) plen 4
> #2 [hci0] 20:54:57.779936
LE Set Scan Parameters (0x08|0x000b) ncmd 1
Status: Command Disallowed (0x0c)
@ RAW Close: hcitool
4.18 mainline kernel works:
Linux xxx 4.18.20-041820-generic #201812030624 SMP Mon Dec 3 11:25:55 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux
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https://bugs.launchpad.net/bugs/1872122
Title:
Kernel 4.19+: Bluetooth not working; Ubuntu 20.04
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