Wolf Rogner, if you revert the following commit via
https://wiki.ubuntu.com/Kernel/KernelBisection , does your card begin to work
again:
df89d48a8cbdc23578397c6e62d5c9c9e630c610 is the first bad commit
commit df89d48a8cbdc23578397c6e62d5c9c9e630c610
Author: Matthew Garrett <[email protected]>
Date: Thu Nov 10 16:38:33 2011 -0500
PCI: Rework ASPM disable code
BugLink: http://bugs.launchpad.net/bugs/927848
commit 3c076351c4027a56d5005a39a0b518a4ba393ce2 upstream.
Right now we forcibly clear ASPM state on all devices if the BIOS indicates
that the feature isn't supported. Based on the Microsoft presentation
"PCI Express In Depth for Windows Vista and Beyond", I'm starting to think
that this may be an error. The implication is that unless the platform
grants full control via _OSC, Windows will not touch any PCIe features -
including ASPM. In that case clearing ASPM state would be an error unless
the platform has granted us that control.
This patch reworks the ASPM disabling code such that the actual clearing
of state is triggered by a successful handoff of PCIe control to the OS.
The general ASPM code undergoes some changes in order to ensure that the
ability to clear the bits isn't overridden by ASPM having already been
disabled. Further, this theoretically now allows for situations where
only a subset of PCIe roots hand over control, leaving the others in the
BIOS state.
It's difficult to know for sure that this is the right thing to do -
there's zero public documentation on the interaction between all of these
components. But enough vendors enable ASPM on platforms and then set this
bit that it seems likely that they're expecting the OS to leave them alone.
Measured to save around 5W on an idle Thinkpad X220.
Signed-off-by: Matthew Garrett <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Tim Gardner <[email protected]>
** Tags added: likely-dup
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
** Summary changed:
- 14e4:16bc SD Card does not work
+ 14e4:16bc [MacBookPro10,1] SD Card does not work
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https://bugs.launchpad.net/bugs/1225652
Title:
14e4:16bc [MacBookPro10,1] SD Card does not work
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