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. Alan Stern -- 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
