Enable 900Mhz P-State on AMD A8-4500M running Ubuntu 14.04

I have undervolted my CPU using TurionPowerControl and it lowered the CPU temperature from 88°C to 76°C.Now I also need to reduce the idle temperature (I have already undervolted all my P-States and my idle is 50C. The room temperature is 28 - 33°C) so I think I would need to reduce the clock speed on idle. Here is the output of sudo tpc -l

Code:

TurionPowerControl 0.44-rc2+ (export) Linux 64-bit
Turion Power States Optimization and Control - by blackshard


Main processor is Family 15h (Bulldozer/Interlagos/Valencia) Processor
    Family: 0xf        Model: 0x0        Stepping: 0x1
    Extended Family: 0x15    Extended Model: 0x10
    Package Type: 0x1    BrandId: 0x0    
Machine has 1 nodes
Processor has 4 cores
Processor has 8 p-states
Processor has 2 boost states


Power States table:
-- Node: 0 Core 0
core 0 pstate 0 (pb0) - En:1 VID:52 FID:12 DID:0.00 Freq:2800 VCore:1.2250
core 0 pstate 1 (pb1) - En:1 VID:100 FID:7 DID:0.00 Freq:2300 VCore:0.9250
core 0 pstate 2 (p0) - En:1 VID:114 FID:3 DID:0.00 Freq:1900 VCore:0.8375
core 0 pstate 3 (p1) - En:1 VID:118 FID:2 DID:0.00 Freq:1800 VCore:0.8125
core 0 pstate 4 (p2) - En:1 VID:119 FID:1 DID:0.00 Freq:1700 VCore:0.8062
core 0 pstate 5 (p3) - En:1 VID:122 FID:16 DID:1.00 Freq:1600 VCore:0.7875
core 0 pstate 6 (p4) - En:1 VID:128 FID:12 DID:1.00 Freq:1400 VCore:0.7500
core 0 pstate 7 (p5) - En:0 VID:128 FID:2 DID:1.00 Freq:900 VCore:0.7500
-- Node: 0 Core 1
core 1 pstate 0 (pb0) - En:1 VID:52 FID:12 DID:0.00 Freq:2800 VCore:1.2250
core 1 pstate 1 (pb1) - En:1 VID:100 FID:7 DID:0.00 Freq:2300 VCore:0.9250
core 1 pstate 2 (p0) - En:1 VID:114 FID:3 DID:0.00 Freq:1900 VCore:0.8375
core 1 pstate 3 (p1) - En:1 VID:118 FID:2 DID:0.00 Freq:1800 VCore:0.8125
core 1 pstate 4 (p2) - En:1 VID:119 FID:1 DID:0.00 Freq:1700 VCore:0.8062
core 1 pstate 5 (p3) - En:1 VID:122 FID:16 DID:1.00 Freq:1600 VCore:0.7875
core 1 pstate 6 (p4) - En:1 VID:128 FID:12 DID:1.00 Freq:1400 VCore:0.7500
core 1 pstate 7 (p5) - En:0 VID:128 FID:2 DID:1.00 Freq:900 VCore:0.7500
-- Node: 0 Core 2
core 2 pstate 0 (pb0) - En:1 VID:52 FID:12 DID:0.00 Freq:2800 VCore:1.2250
core 2 pstate 1 (pb1) - En:1 VID:100 FID:7 DID:0.00 Freq:2300 VCore:0.9250
core 2 pstate 2 (p0) - En:1 VID:114 FID:3 DID:0.00 Freq:1900 VCore:0.8375
core 2 pstate 3 (p1) - En:1 VID:118 FID:2 DID:0.00 Freq:1800 VCore:0.8125
core 2 pstate 4 (p2) - En:1 VID:119 FID:1 DID:0.00 Freq:1700 VCore:0.8062
core 2 pstate 5 (p3) - En:1 VID:122 FID:16 DID:1.00 Freq:1600 VCore:0.7875
core 2 pstate 6 (p4) - En:1 VID:128 FID:12 DID:1.00 Freq:1400 VCore:0.7500
core 2 pstate 7 (p5) - En:0 VID:128 FID:2 DID:1.00 Freq:900 VCore:0.7500
-- Node: 0 Core 3
core 3 pstate 0 (pb0) - En:1 VID:52 FID:12 DID:0.00 Freq:2800 VCore:1.2250
core 3 pstate 1 (pb1) - En:1 VID:100 FID:7 DID:0.00 Freq:2300 VCore:0.9250
core 3 pstate 2 (p0) - En:1 VID:114 FID:3 DID:0.00 Freq:1900 VCore:0.8375
core 3 pstate 3 (p1) - En:1 VID:118 FID:2 DID:0.00 Freq:1800 VCore:0.8125
core 3 pstate 4 (p2) - En:1 VID:119 FID:1 DID:0.00 Freq:1700 VCore:0.8062
core 3 pstate 5 (p3) - En:1 VID:122 FID:16 DID:1.00 Freq:1600 VCore:0.7875
core 3 pstate 6 (p4) - En:1 VID:128 FID:12 DID:1.00 Freq:1400 VCore:0.7500
core 3 pstate 7 (p5) - En:0 VID:128 FID:2 DID:1.00 Freq:900 VCore:0.7500


 --- Node 0:
Processor Maximum PState: 7
Processor Startup PState: 5
Processor Maximum Operating Frequency: 2800 MHz


Minimum allowed VID: 184 (0.4000V) - Maximum allowed VID 52 (1.2250V)
Done.

As you can see I have undervolted my CPU but the 900Mhz is disabled (it was the same before undervolt).I tried enabling it with sudo tpc -core all -en 7 but it doesn't appear in CPUFreq Indicator and also cpufreq-aperf doesn't show it going to the 900Mhz freqency even with Powersave governer.So how can I enable it and use the P-State.

Laptop specs

Manufacturer : Hewlett Packard
Model : Pavilion g7 2269wm
CPU / APU : 1.9Ghz up to 2.8Ghz AMD Quad-Core A8-4500M Accelerated Processor
RAM : 6GB DDR3 SDRAM (2 DIMM user accessible)
GPU : AMD Radeon HD 7640G Discrete-Class graphics and up to 3060MB total graphics memory
Display : 17.3-inch diagonal HD+ BrightView LED-backlit display (1600 x 900)
Touchpad : Touchpad support multitouch gestures with on/off button

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Enable 900Mhz P-State on AMD A8-4500M running Ubuntu 14.04