6.1-PRE boot locks up, using USB keyboard

John Baldwin jhb at freebsd.org
Wed Mar 15 17:26:53 UTC 2006


On Wednesday 15 March 2006 12:11, Rick C. Petty wrote:
> On Wed, Mar 15, 2006 at 10:46:01AM -0500, John Baldwin wrote:
> 
> > > I'm using a USB keyboard, no PS/2.  I've tried the hint to disable kbdmux,
> > > I've tried with and without selecting the "Boot w/ USB keyboard" and the
> > > machine locks up in the same spot no matter what I try.  The same hardware
> > > boots just fine with 6.0-RELEASE (although I need to choose the USB
> > > keyboard option if I plan on typing).  Any suggestions?
> > 
> > What if you turn off USB keyboard support in your BIOS?
> 
> My BIOS (Asus A8N-E rev 1010) has no option for disabling USB keyboard
> support, but I can either disable the USB controller or disable the USB
> legacy support.  I doubt either of these is desirable.  Fortunately, I
> discovered the problem..

The "legacy support" option is the one that makes a USB keyboard look like
a PS/2 keyboard.

> The ukbd device is compiled into GENERIC.  I also had ukbd_load="YES" in my
> loader.conf so it would be compatible with a custom kernel.  When GENERIC
> boots, I get the message that ukbd is already loaded ("file exists").  I
> would expect that the kernel just ignores the attempt, but apparently there
> is an adverse effect.  Whenever ukbd is loaded by /boot/loader and that
> device already exists in the kernel, the boot locks up after:
> 
> atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
> 
> when using a USB keyboard.  I would think this is a bug.  It is 100%
> repeatable for me.  If I comment out the line in /boot/loader.conf, the
> system boots nicely.  Perhaps this is related to kbdmux(4), but I'm not
> sure.  I've also noticed related problems when trying to load umass and ums
> through the boot loader and manually (I will try to reproduce these).
> Maybe the problem is in the USB layer??
> 
> FYI, I tried this on 6.1-BETA4, fresh from the ISOs.

Ok.  There are several edge cases that can blow up if you kldload a module
or load a module from the loader that is already present in the kernel.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org


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