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@@ -256,3 +256,48 @@ Why: Speedstep-centrino driver with ACPI hooks and acpi-cpufreq driver are
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Who: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
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---------------------------
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+
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+What: ACPI hotkey driver (CONFIG_ACPI_HOTKEY)
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+When: 2.6.21
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+Why: hotkey.c was an attempt to consolidate multiple drivers that use
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+ ACPI to implement hotkeys. However, hotkeys are not documented
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+ in the ACPI specification, so the drivers used undocumented
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+ vendor-specific hooks and turned out to be more different than
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+ the same.
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+
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+ Further, the keys and the features supplied by each platform
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+ are different, so there will always be a need for
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+ platform-specific drivers.
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+
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+ So the new plan is to delete hotkey.c and instead, work on the
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+ platform specific drivers to try to make them look the same
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+ to the user when they supply the same features.
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+
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+ hotkey.c has always depended on CONFIG_EXPERIMENTAL
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+
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+Who: Len Brown <len.brown@intel.com>
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+
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+---------------------------
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+
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+What: /sys/firmware/acpi/namespace
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+When: 2.6.21
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+Why: The ACPI namespace is effectively the symbol list for
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+ the BIOS. The device names are completely arbitrary
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+ and have no place being exposed to user-space.
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+
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+ For those interested in the BIOS ACPI namespace,
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+ the BIOS can be extracted and disassembled with acpidump
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+ and iasl as documented in the pmtools package here:
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+ http://ftp.kernel.org/pub/linux/kernel/people/lenb/acpi/utils
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+
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+Who: Len Brown <len.brown@intel.com>
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+
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+---------------------------
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+
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+What: /proc/acpi/button
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+When: August 2007
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+Why: /proc/acpi/button has been replaced by events to the input layer
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+ since 2.6.20.
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+Who: Len Brown <len.brown@intel.com>
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+
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+---------------------------
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Len Brown