On Wed, 28 Jul 2004, Tuukka Toivonen wrote: > Thanks for your suggestions. I must apologize that I was incorrect: it > wasn't a problem in 2.6.7 but rather in my LILO configuration. The root for > the problems was "serial console" (which was enabled for 2.6.7 but not for > other kernels). > > By enabling serial console, 2.6.0 had the same behaviour. By disabling it, > 2.6.7 worked fine too. > > On Sun, 25 Jul 2004, Alan Stern wrote: > > >To narrow down the possible causes, you could try adding a printk() > >statement to the UHCI driver's interrupt routine. Put it in > > If I did this with serial console enabled, the computer pretty much hanged. > I had to use SysRq+S/U/S/B to reboot (which fortunately worked fine). > I also got this interesting message into system logs a few times: > > <4>uhci_irq(hcd=f6c3fbf8), status=0x00000001 > <4>uhci_irq(hcd=f6c3fbf8), status=0x00000001 > <4>uhci_irq(hcd=f6c3fbf8), status=0x00000001 > <4>Losing too many ticks! > <4>TSC cannot be used as a timesource. > <4>Possible reasons for this are: > <4> You're running with Speedstep, > <4> You don't have DMA enabled for your hard disk (see hdparm), > <4> Incorrect TSC synchronization on an SMP system (see dmesg). > <4>Falling back to a sane timesource now. > <4>uhci_irq(hcd=f6c3fbf8), status=0x00000001 > <4>uhci_irq(hcd=f6c3fbf8), status=0x00000001 > <4>uhci_irq(hcd=f6c3fbf8), status=0x00000001 > > I think I don't have enough motivation/skill/time to debug this further, > at least if it can be duplicated by other people. But I'm willing to help > if there is some information that I should give. Let me know if there is > some other place where I should report this problem.
My knowledge of how a serial console works is very limited, but I can easily imagine that it ends up disabling interrupts for an extended period of time. So long as you're okay without a serial console, my advice is not to worry any further. Alan Stern ------------------------------------------------------- This SF.Net email is sponsored by BEA Weblogic Workshop FREE Java Enterprise J2EE developer tools! Get your free copy of BEA WebLogic Workshop 8.1 today. http://ads.osdn.com/?ad_id=4721&alloc_id=10040&op=click _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
