http://bugzilla.kernel.org/show_bug.cgi?id=12859

           Summary: Special keys unusable after resume on battery - T21
           Product: ACPI
           Version: 2.5
     KernelVersion: 2.6.29-rc7
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Sleep-Wake
        AssignedTo: acpi_power-sleep-w...@kernel-bugs.osdl.org
        ReportedBy: lmc...@gmail.com


Latest working kernel version:
unknown or none

Earliest failing kernel version:
Earliest _tested_ by me failing kernel was 2.6.25

Distribution:
Debian 4.0, 5.0

Hardware Environment:
IBM Thinkpad T21

Problem Description:
IBM's special keys (Fn-X[*]) doesn't work after resume iff laptop is resumed on
battery, without AC power connected. 

[*] X can be
F4 - suspend to ram,
F7 - change video output (lcd, lcd+crt, crt),
F12 - suspend to disk.

This bug is special case of http://bugzilla.kernel.org/show_bug.cgi?id=11674

In this case special keys do work if suspend and resume is on AC power (without
disconnecting AC in between).

Steps to reproduce:
1. Boot laptop on AC power
2. Suspend
3. Disconnect AC power
4. Resume


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