Messages in this thread | | | Subject | Re: FADT errors reported by Lenovo T61 | From | Paul Bolle <> | Date | Mon, 18 Nov 2013 10:42:07 +0100 |
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On Mon, 2013-11-18 at 10:22 +0100, Zdenek Kabelac wrote: > I've noticed strange errors in the log - while my wifi seems to work ok, > the surrounding errors do not seem normal. > > Is there anything I could do to fix them ? > Or it will remain broken or there could workaround ? > > I'm attaching my boot log - with: > > "ACPI BIOS Warning (bug): 32/64X length mismatch in FADT/Gpe1Block: 0/32 > (20130725/tbfadt-572)" > > which probably leads to - > > "ACPI FADT declares the system doesn't support PCIe ASPM, so disable it" > > and > > "acpi PNP0A08:00: Disabling ASPM (FADT indicates it is unsupported)" > > and at the end after my networking is started I get this: > > iwl3945: Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux, > in-tree:ds > iwl3945: Copyright(c) 2003-2011 Intel Corporation > iwl3945 0000:03:00.0: can't disable ASPM; OS doesn't have ASPM control
The ASPM stuff need not be related to that "ACPI BIOS Warning (bug)" line you saw.
I noticed similar ASPM messages on a ThinkPad X220 (I'm not sure whether they are new, as I only recently acquired that X220): $ sudo grep -e ASPM -e FADT $(ls -1tr /var/log/messages*) [...] [...] kernel: [ 0.080253] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it [...] kernel: [ 0.126158] acpi PNP0A08:00: ACPI _OSC control for PCIe not granted, disabling ASPM [...] kernel: [ 4.448730] iwlwifi 0000:03:00.0: can't disable ASPM; OS doesn't have ASPM control
I remember looking at the code that generates these messages and thinking they were confusing. It seems "disabling ASPM" means something subtly different than "disable ASPM". But I can't remember exactly. Anyhow, I haven't yet tried suggesting alternatives for these messages. Perhaps I'll do that one of these days.
Paul Bolle
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