On Wed, 22 Mar 2006, Thomas Thanner wrote:

> Hello alltogether,
> 
> I have encountered an interesting issue when using a low-speed USB mouse over 
> a hi-speed USB 2.0 hub.
> 
> My setup is the following:
> 
> +-------------+    +-------------+    +-------+
> | Motherboard |<-->| USB 2.0 Hub |<-->| Mouse |
> +-------------+    +-------------+    +-------+
> 
> Motherboard is a Supermicro X6DH3-G2 with dual XEON 3GHz.
> USB 2.0 Hub is a Philips ISP1520
> Mouse is a general purpose optical USB mouse made by Logitec.
> Kernel is a 2.6.11 with SMP support enabled.
> 
> UHCI driver is compiled directly into kernel. EHCI driver is modular.
> 
> When mouse is moved during boot, boot process stops when the UHCI driver gets 
> initialized.
> 
> When UHCI driver is compiled as a module, everything works fine.
> 
> Has anyone an explanation for this interesting behaviour?

Not me.  Does the same thing happen with a 2.6.16 kernel?

Alan Stern



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