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

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Message-ID: <20250630123257.3bcfa86b@foxbook>
Date: Mon, 30 Jun 2025 12:32:57 +0200
From: Michał Pecio <michal.pecio@...il.com>
To: VladTop46 <mcsm2654@...il.com>
Cc: jikos@...nel.org, 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 00:09:31 +0900, 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.
> 
> Hardware:
> 
> - Device: Skyloong GK104 Pro (detected as "Semitek Gaming Keyboard", USB 
> ID: 1ea7:0907)
> - Motherboard: ASUS ROG STRIX B550-A GAMING
> - CPU: AMD Ryzen 9 5900X
> - Distro: Arch Linux

No progress on that? I think git-bisect is your best bet, then.

Is this by any chance unique to USB ports on AMD desktop motherboards?
Their chipsets are particularly slow to perform USB control transfers,
so that could be a factor.

Regards,
Michal