Hi Alan, On Wed, Aug 27, 2014 at 10:38 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Wed, 27 Aug 2014, Gavin Guo wrote: > >> > Still, why not use the BIOS setting to disable EHCI? >> >> It's hardware enablement policy. By default, we can't change the BIOS >> setting to make the bug disappear until we find out the bug is due to >> BIOS's bug. Add kernel parameters is the temporary solution for the >> platform can ship. And if the bug is from kernel, we need to send >> patches to upstream and pull back to Ubuntu kernel or send to Ubuntu >> Kernel directly if it's a trivial solution like adding device id. >> However, as you said, in this case about the bug the root may be from >> BIOS code. So, we can coordinate with the OEM BIOS team to modify the >> default BIOS setting. > > There is no doubt that the BIOS is buggy. Your log contains this line: > > [ 2.804205] pci 0000:00:1d.0: EHCI: BIOS handoff failed (BIOS bug?) 01010001 > > The only way that can happen is if the BIOS isn't working right. > However, this may be a different bug from the crashes you've been > seeing. Thanks for your comments. I really appreciate your support. Gavin Guo > > Alan Stern > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
