Re: USB: Lexar E300 21c4:b083 fails SuperSpeedPlus negotiation due to missing BOS descriptor — request for NO_BOS quirk

[Michal Pecio <michal.pecio@gmail.com>]

On Sat, 9 May 2026 06:07:19 +0200, Gregkh wrote:
> On Fri, May 08, 2026 at 09:18:22PM +0200, c2mismo wrote:
> > 
> > Dear USB subsystem maintainers,
> > 
> > I have a Lexar E300 M.2 SSD enclosure (idVendor=0x21c4,
> > idProduct=0xb083) that supports USB 3.2 Gen 2 (10 Gbps). Under
> > Linux it always negotiates down to 5 Gbps, while on Windows the
> > same hardware (cable, port) works correctly at 10 Gbps
> > (CrystalDiskMark ~1087 MB/s vs ~450 MB/s on Linux).
> > 
> > The kernel log shows that the device initially attempts SuperSpeed
> > Plus (Gen 2x1) but fails to provide a valid BOS descriptor, causing
> > an error -71 and a forced fallback to SuperSpeed (5 Gbps):

Where does it show that?
 
> > [  179.146227] usb 2-1: new SuperSpeed Plus Gen 2x1 USB device number 4 using xhci_hcd
> > [  182.237405] usb 2-1: USB disconnect, device number 4
> > [  182.420843] sd 12:0:0:0: [sda] Synchronize Cache(10) failed: Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
> > [  182.552343] usb usb2-port1: config error
> > [  183.131966] usb 2-1: new SuperSpeed USB device number 5 using xhci_hcd

Users with confirmed BOS problems had different logs:
https://bugzilla.kernel.org/show_bug.cgi?id=218943
https://bugzilla.kernel.org/show_bug.cgi?id=220027

> > i did try to add the following entry to drivers/usb/core/quirks.c
> > in the usb_quirk_list[]:
> > 
> > { USB_DEVICE(0x21c4, 0xb083), .driver_info = USB_QUIRK_NO_BOS },
> > 
> > I am running Arch Linux with kernel 7.0.3 (in the recent version
> > does not contain the NO_BOS definition in its source),  
> 
> 7.0.3 has that quirk flag, so this should work.

Well, maybe it's doesn't because it's a different issue?

Regards,
Michal