x86: Enable monitor/mwait on Intel if BIOS hasn't already

My Intel DQ67SW (latest BIOS) disables monitor/mwait on the boot CPU
if TXT is enabled.  We're lucky that the system works at all, since
the feature is still enabled on other CPUs.

The obvious fix is to just re-enable it ourselves.

Signed-off-by: Andy Lutomirski <luto@mit.edu>
Skip looking for ioapic overrides when ioapics are not present

Avinash Kurup <kurup.avinash@gmail.com> writes:

> Hi Eric,
>     I get the following errors while booting into 2.6.35-rc1. I did not
> get these in 2.6.34 . The computer however boots and works fine, So its not
> serious but the following errors are displayed in dmesg.
>
> [    0.089969] ERROR: Unable to locate IOAPIC for GSI 13
> [    0.090556] ERROR: Unable to locate IOAPIC for GSI 8
> [    0.091104] ERROR: Unable to locate IOAPIC for GSI 12
> [    0.091375] ERROR: Unable to locate IOAPIC for GSI 1
> [    0.093195] ERROR: Unable to locate IOAPIC for GSI 4
> [    0.094342] ERROR: Unable to locate IOAPIC for GSI 10
> [    0.096335] ERROR: Unable to locate IOAPIC for GSI 6

The new warning originates from acpi_get_override_irq, which I changed to
use helper functions that warn when they fail.

When IOAPICs and ACPI are enabled in a kernel and run on ACPI hardware
that doesn't use the ioapics the pnp acpi code calls this function,
looking for ACPI irq overrides.  ACPI irq overrides exist only in the
ioapic case so this function will never succeed.  So make the function
fail fast so we don't call into help functions that legitimately
complain when they fail.

Tested-by: Avinash Kurup <kurup.avinash@gmail.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
[bwh: Add config condition]
Still use ACPI backlight control if _DOS doesn't exist

This is a regression introduced by commit
ea9f8856bd6d4ed45885b06a338f7362cd6c60e5

https://bugzilla.kernel.org/show_bug.cgi?id=43168

Some platforms don't have _DOS control method, but the ACPI
backlight still works.
We do not want to lose the backlight control ability on these platforms.

CC : Igor Murzov <intergalactic.anonymous@gmail.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
net: combat buffer bloat

Set tx_queue_len to 50 (FreeBSD default) from 1000 to reduce latencies.  Set
tcp_ecn to 1 to force enable Explicit Congestion Notification.  These two
changes should make a positive impact network performance.  Possible drop in
throughput with 1 gbit and faster networks.

net: restore tcp_ecn default

Forcing ECN breaks some Cisco routers with SPI firewall enabled.
ACPI: Disable Windows 8 compatibility for Lenovo ThinkPad T430s and X230

The AML implementation for brightness control on these machines contains
a workaround to meet the Windows 8 requirement of 101 brightness levels.
This implementation is flawed, as only 16 of the brighness values
reported by _BCL affect a change in brightness. _BCM silently discards
the rest of the values. Disabling Windows 8 compatibility on these
machines reverts them to the old behavior, making _BCL only report the
16 brightness levels which actually work. Add a quirk to do this along
with a dmi callback to disable Win8 compatibility.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=51231
BugLink: http://bugs.launchpad.net/bugs/1098216
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
ACPI: add Lenovo ThinkPad T430 to blacklist
cpufreq: add enhanced idle support for atom n2600/n2800 series

Per bugzilla and techpatterns forums, Intel Atom N2600/N2800 series support
C-states that the intel_idle idle module utilizes.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=60201
Techpatterns: http://techpatterns.com/forums/about2306.html
UBUNTU: SAUCE: (no-up) Input: synaptics - add second variant of two-button clickpad

This is necessary for clickpad detection of Synaptics trackpads in Dell
Mini 10 series of laptops.

no-up comments: Keep both, so long as they continue to apply cleanly.
The patches apply only to a couple of old Dell minis, and Dell has said
they don't intend to use those touchpads again. Upstreaming these
patches stalled due to lack of information/response, and continuing to
pursue it probably isn't worth the effort, so they can be marked no-up.
There's no harm in keeping the patches, but if they become a problem
they can be dropped.

Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Andy Whitcroft <andy.whitcroft@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
UBUNTU: SAUCE: (no-up) Input: synapticss - Set buttonpad property for all clickpads

no-up comments: Keep both, so long as they continue to apply cleanly.
The patches apply only to a couple of old Dell minis, and Dell has said
they don't intend to use those touchpads again. Upstreaming these
patches stalled due to lack of information/response, and continuing to
pursue it probably isn't worth the effort, so they can be marked no-up.
There's no harm in keeping the patches, but if they become a problem
they can be dropped.

Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Andy Whitcroft <andy.whitcroft@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
x86: Enable fast strings on Intel if BIOS hasn't already

Intel SDM volume 3A, 8.4.2 says:

  Software can disable fast-string operation by clearing the
  fast-string-enable bit (bit 0) of IA32_MISC_ENABLE MSR.
  However, Intel recomments that system software always enable
  fast-string operation.

The Intel DQ67SW board (with latest BIOS) disables fast string
operations if TXT is enabled.  A Lenovo X220 disables it regardless
of TXT setting.  I doubt I'm the only person with a dumb BIOS like
this.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>