[keymap] Sony Vaio VGN-FW250

I have a Sony Vaio VGN-FW250J laptop and the hotkey for suspending (FN + F12) is mapped as brightness up instead. I followed the instructions on Ubuntu wiki for troubleshooting hotkeys and found out with the help of "evtest" that the hotkey is recognized as "Event code 225 (KEY_BRIGHTNESSUP)" instead of "Event code 205 (KEY_SUSPEND)". I have pasted the evtest report below. This has persisted for several Ubuntu version (, but I failed to report it until now because of procrastination).

Input driver version is 1.0.1
Input device ID: bus 0x10 vendor 0x104d product 0x0 version 0x0
Input device name: "Sony Vaio Keys"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 113 (KEY_MUTE)
    Event code 114 (KEY_VOLUMEDOWN)
    Event code 115 (KEY_VOLUMEUP)
    Event code 138 (KEY_HELP)
    Event code 148 (KEY_PROG1)
    Event code 149 (KEY_PROG2)
    Event code 158 (KEY_BACK)
    Event code 161 (KEY_EJECTCD)
    Event code 183 (KEY_F13)
    Event code 184 (KEY_F14)
    Event code 185 (KEY_F15)
    Event code 202 (KEY_PROG3)
    Event code 203 (KEY_PROG4)
    Event code 205 (KEY_SUSPEND)
    Event code 224 (KEY_BRIGHTNESSDOWN)
    Event code 225 (KEY_BRIGHTNESSUP)
    Event code 226 (KEY_MEDIA)
    Event code 227 (KEY_SWITCHVIDEOMODE)
    Event code 237 (KEY_BLUETOOTH)
    Event code 238 (KEY_WLAN)
    Event code 289 (BTN_THUMB)
    Event code 360 (KEY_VENDOR)
    Event code 372 (KEY_ZOOM)
    Event code 418 (KEY_ZOOMIN)
    Event code 419 (KEY_ZOOMOUT)
    Event code 465 (KEY_FN_ESC)
    Event code 466 (KEY_FN_F1)
    Event code 473 (KEY_FN_F8)
    Event code 474 (KEY_FN_F9)
    Event code 476 (KEY_FN_F11)
    Event code 480 (KEY_FN_D)
    Event code 483 (KEY_FN_S)
  Event type 4 (EV_MSC)
    Event code 4 (MSC_SCAN)
Properties:
Testing ... (interrupt to exit)
Event: time 1390302749.935939, type 4 (EV_MSC), code 4 (MSC_SCAN), value 10
Event: time 1390302749.935939, type 1 (EV_KEY), code 225 (KEY_BRIGHTNESSUP), value 1
Event: time 1390302749.935939, -------------- SYN_REPORT ------------
Event: time 1390302749.946123, type 1 (EV_KEY), code 225 (KEY_BRIGHTNESSUP), value 0
Event: time 1390302749.946123, -------------- SYN_REPORT ------------

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: udev 204-5ubuntu9
ProcVersionSignature: Ubuntu 3.13.0-4.19-generic 3.13.0-rc8
Uname: Linux 3.13.0-4-generic x86_64
ApportVersion: 2.13.1-0ubuntu1
Architecture: amd64
CasperVersion: 1.336ubuntu1
CurrentDesktop: Unity
Date: Tue Jan 21 11:14:22 2014
LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140121)
MachineType: Sony Corporation VGN-FW250J
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/27/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: R1100Y0
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR1100Y0:bd08/27/2009:svnSonyCorporation:pnVGN-FW250J:pvrC600QXY1:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VGN-FW250J
dmi.product.version: C600QXY1
dmi.sys.vendor: Sony Corporation