Remove 9 second reboot delay on Lenovo T400/T500
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From: Matthew Garrett on 14 Jul 2010 10:40 On Wed, Jul 14, 2010 at 03:33:08PM +0100, Pedro Ribeiro wrote: > Please consider this patch. Let me know if you would like me to change > anything or if you don't agree with it. It applies cleanly to 2.6.35-rc5. > > The Lenovo T400 and T500 have an annoying 9 second delay when > rebooting, unless reboot=pci is passed to the kernel command line. > This delay happens from at least kernel 2.6.20. > > Make this change permanent by hardcoding the Tx00 on the > arch/kernel/reboot.c pci quirks table. There's two possibilities here: 1) Lenovo's firmware is broken and the 9-second delay is always going to be there. In that case we should try to use the ACPI reboot vector first. 2) We're doing something wrong in our shutdown sequence which then triggers this problem as a result. Either way, I think this patch is wrong. -- Matthew Garrett | mjg59(a)srcf.ucam.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Nick Bowler on 14 Jul 2010 11:30
On 15:36 Wed 14 Jul , Matthew Garrett wrote: > On Wed, Jul 14, 2010 at 03:33:08PM +0100, Pedro Ribeiro wrote: > > The Lenovo T400 and T500 have an annoying 9 second delay when > > rebooting, unless reboot=pci is passed to the kernel command line. > > This delay happens from at least kernel 2.6.20. [...] > 1) Lenovo's firmware is broken and the 9-second delay is always going to > be there. In that case we should try to use the ACPI reboot vector > first. While it may be true that the firmware is buggy, reboot=acpi does not solve the problem; reboot=pci does. -- Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |