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[81.224.151.184]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c2dbd380646sm49097966b.68.2026.09.26.05.12.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 26 Sep 2026 05:12:03 -0700 (PDT) From: Erik =?UTF-8?B?SMOla2Fuc3Nvbg==?= To: Oleksandr Natalenko Cc: Benjamin Tissoires , Jiri Kosina , Filipe =?UTF-8?B?TGHDrW5z?= , Bastien Nocera , Rafael Passos , =?UTF-8?B?R3LDqWdvaXJl?= Stein , Alexey Zagorodnikov , Roman Stingler , Lovekesh Solanki , =?UTF-8?B?S2F0ZcWZaW5hIE1lZHbEm2RvdsOh?= , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/2] HID: logitech-hidpp: fix Bolt hi-res wheel handling Date: Sat, 26 Sep 2026 14:12:01 +0200 Message-ID: In-Reply-To: References: <20260922-feature-bolt-fix-v1-0-63b0fa8da0d3@gmail.com> <2UD2rmaWS9W0wgq6AdNLxw@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" Hi! On Saturday, 26 September 2026 13:39:18 Central European Summer Time Oleksandr Natalenko wrote: > > This is touching: > > 0000 00 23 e7 90 c5 8d ff ff 43 01 83 03 01 00 2d 00 .#......C.....-. > 0010 76 ae b7 6a 00 00 00 00 01 1a 0e 00 00 00 00 00 v..j............ > 0020 14 00 00 00 14 00 00 00 00 00 00 00 00 00 00 00 ................ > 0030 01 00 00 00 00 00 00 00 04 02 00 00 00 00 00 00 ................ > 0040 11 02 13 00 00 00 00 00 00 02 00 00 00 00 00 00 ................ > 0050 00 00 00 00 .... > > This is untouching: > > 0000 00 23 e7 90 c5 8d ff ff 43 01 83 03 01 00 2d 00 .#......C.....-. > 0010 79 ae b7 6a 00 00 00 00 5e c1 05 00 00 00 00 00 y..j....^....... > 0020 14 00 00 00 14 00 00 00 00 00 00 00 00 00 00 00 ................ > 0030 01 00 00 00 00 00 00 00 04 02 00 00 00 00 00 00 ................ > 0040 11 02 13 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 0050 00 00 00 00 Great, thanks! This confirms that touch, but not tap or proximity, comes in on HID++ but not at all on native HID. I don't think evdev has a very good output to map it to though, so maybe I'll leave it unmapped for now. BTN_TOUCH combined with some appropriate BTN_TOOL_* for denoting thumbwheel would be a semantic fit, but I think there's a risk that userspace starts to interpret the device as a touchscreen then, if I understand the input event codes documentation correctly: https://github.com/torvalds/linux/blob/master/Documentation/input/event-codes.rst By the way, when Thumbwheel Divertion is on, do you get the regular thumbwheel scroll events on HID++ too? That would be the 81 (native HID) or 83 (HID++) on byte 11 in the hex output :) Cheers Erik