Re: [PATCH] HID: plantronics: Workaround for double volume key presses

On Sun, 7 Feb 2021, Maxim Mikityanskiy wrote:

Plantronics Blackwire 3220 Series (047f:c056) sends HID reports twice
for each volume key press. This patch adds a quirk to hid-plantronics
for this product ID, which will ignore the second volume key press if
it happens within 5 ms from the last one that was handled.

The patch was tested on the mentioned model only, it shouldn't affect
other models, however, this quirk might be needed for them too.
Auto-repeat (when a key is held pressed) is not affected, because the
rate is about 3 times per second, which is far less frequent than once
in 5 ms.

Fixes: 81bb773faed7 ("HID: plantronics: Update to map volume up/down controls")
Signed-off-by: Maxim Mikityanskiy <redacted>
---
People from Plantronics, maybe you could advise on a better fix than
filtering duplicate events on driver level? Do you happen to know why
they occur in the first place? Are any other headsets affected?

Makes one wonder how the Windows driver is dealing with this indeed.
Anyway, as there doesn't seem to be better cure available for now, I have 
applied the patch. Thanks,

-- 
Jiri Kosina
SUSE Labs