linux-kernel - Re: [REGRESSION] USB HID initialization delay (~8s) for Semitek keyboard on kernel 6.15.*

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Message-ID: <snor7s95-5961-o5s7-440o-7q02r81ps057@xreary.bet>
Date: Fri, 20 Jun 2025 08:55:13 +0200 (CEST)
From: Jiri Kosina <jikos@...nel.org>
To: VladTop46 <mcsm2654@...il.com>
cc: bentiss@...nel.org, linux-usb@...r.kernel.org, 
    linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] USB HID initialization delay (~8s) for Semitek
 keyboard on kernel 6.15.*

On Fri, 13 Jun 2025, VladTop46 wrote:

> Hi Jiri and Benjamin,
> 
> I'm reporting a regression in USB HID initialization timing for the Skyloong
> GK104 Pro keyboard (detected as "Semitek Gaming Keyboard", USB ID: 1ea7:0907),
> which I observed when upgrading from Linux kernel 6.14 to 6.15.
> 
> Summary:
> On kernel 6.15.2, the keyboard takes approximately 8 seconds longer to become
> initialized and usable compared to 6.12.33-lts. The USB device is discovered
> at the same time, but HID input registration is significantly delayed. After
> that, the device functions normally.

Hmm, there were absolutely no changes going to hid-semitek driver at all 
between these two versions, so it's probably either USB or Input related.

Are you by any chance able to do git bisection easily?

Thanks,

-- 
Jiri Kosina
SUSE Labs