rskumar@nitefury:~$
rskumar@nitefury:~$ sudo modprobe acpi-cpufreq
rskumar@nitefury:~$ lsmod | grep acpi
rskumar@nitefury:~$ lsmod
Module                  Size  Used by
msr                    12908  0
rfcomm                 47604  12
parport_pc             32866  0
bnep                   18281  2
ppdev                  17113  0
dm_crypt               23125  1
snd_hda_codec_hdmi     32474  1
snd_hda_codec_realtek   223867  1
arc4                   12529  2
snd_hda_intel          33773  3
uvcvideo               72627  0
snd_hda_codec         127706  3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep              13668  1 snd_hda_codec
snd_pcm                97188  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
iwlwifi               332672  0
snd_seq_midi           13324  0
videodev               98259  1 uvcvideo
snd_rawmidi            30748  1 snd_seq_midi
snd_seq_midi_event     14899  1 snd_seq_midi
snd_seq                61896  2 snd_seq_midi,snd_seq_midi_event
v4l2_compat_ioctl32    17128  1 videodev
mac80211              506816  1 iwlwifi
snd_timer              29990  2 snd_pcm,snd_seq
snd_seq_device         14540  3 snd_seq_midi,snd_rawmidi,snd_seq
snd                    78855  16 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
btusb                  18288  2
psmouse                87692  0
bluetooth             180104  23 rfcomm,bnep,btusb
cfg80211              205544  2 iwlwifi,mac80211
soundcore              15091  1 snd
dell_wmi               12681  0
mac_hid                13253  0
dell_laptop            18119  0
dcdbas                 14490  1 dell_laptop
serio_raw              13211  0
sparse_keymap          13890  1 dell_wmi
snd_page_alloc         18529  2 snd_hda_intel,snd_pcm
mei                    41616  0
lp                     17799  0
parport                46562  3 parport_pc,ppdev,lp
usbhid                 47199  0
hid                    99559  1 usbhid
nouveau               774571  0
ttm                    76949  1 nouveau
i915                  468737  4
mxm_wmi                12979  1 nouveau
drm_kms_helper         46978  2 nouveau,i915
drm                   242038  7 nouveau,ttm,i915,drm_kms_helper
atl1c                  41717  0
i2c_algo_bit           13423  2 nouveau,i915
wmi                    19256  2 dell_wmi,mxm_wmi
video                  19596  2 nouveau,i915
rskumar@nitefury:~$