Found the offending commit after which LinkCtl became ASPM L0s L1
Enabled for ath5k devices:

commit 8c33f51df406e1a1f7fa4e9b244845b7ebd61fa6
Author: Taku Izumi <izumi.t...@jp.fujitsu.com>
Date:   Tue Oct 30 15:27:13 2012 +0900

    PCI/ACPI: Request _OSC control before scanning PCI root bus
    
    This patch moves up the code block to request _OSC control in order to
    separate ACPI work and PCI work in acpi_pci_root_add().
    
    Signed-off-by: Taku Izumi <izumi.t...@jp.fujitsu.com>
    Signed-off-by: Bjorn Helgaas <bhelg...@google.com>

Filed a bug in kernel Bugzilla,
https://bugzilla.kernel.org/show_bug.cgi?id=13892

** Bug watch added: Linux Kernel Bug Tracker #55211
   http://bugzilla.kernel.org/show_bug.cgi?id=55211

** Also affects: linux via
   http://bugzilla.kernel.org/show_bug.cgi?id=55211
   Importance: Unknown
       Status: Unknown

** Bug watch added: Linux Kernel Bug Tracker #13892
   http://bugzilla.kernel.org/show_bug.cgi?id=13892

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https://bugs.launchpad.net/bugs/1137513

Title:
  Wireless 168c:001c with ath5k on Acer Aspire One AOA150 download
  checksum fails

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