Alan Stern wrote:
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
We will test with a 2.6.15 kernel asap, a 2.6.16 has to be prepared for our
system first, so it will take some time before we can do the test.
We have new findings, too. Now it looks like the problem is based on
communication between EHCI and UHCI.
When both are modules, everything works fine.
When both are compiled into kernel, everything works fine.
When UHCI is compiled in and EHCI is module, we have the error.
Thomas
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