Ubuntu 16.04 distorted loading image and Graphic after unlock

Question

I have installed Ubuntu 16.04 LTE on my Sony Vaio Laptop having below configuration:

Ram: 4GB
Graphic Card: AMD Radeon HD 7500M/7600M Series [1024 MB]
Processor: Intel i5-3230M @2.60GHz

Ubuntu is installed successfully. But when I boot into Ubuntu I'm getting distorted UBUNTU loading logo as show below:

After loading everything works fine until I locked the system. Once I locked the system its graphic becomes distorted and unresponsive as shown below:

graphic_issue:

Please help me to fix this issue.

As per requirement, below are details:

lspci -nnk | grep -A2 VGA:

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Thames [Radeon HD 7550M/7570M/7650M] [1002:6841]
    Subsystem: Sony Corporation Thames [Radeon HD 7550M/7570M/7650M] [104d:90ab]
    Kernel driver in use: radeon

/var/log/Xorg.0.log (there were lot of entries in this file, so I attached some piece of information from it).

Have you checked for additional-drivers to see if you can get more robust performance. — user176105, Jul 12 '16 at 20:37
@user176105 i'm getting below options under additional drivers option:
Using processor microcode firmware for intel CPUs from intel-microcode(proprietary) — Deepak Sharma, Jul 14 '16 at 18:23
@DavidFoerster I have made the required changes in question. — Deepak Sharma, Jul 14 '16 at 18:24
Thank you @DavidFoerster, I have added the output using pastie service. — Deepak Sharma, Jul 15 '16 at 18:29
Thanks! Unfortunately I can't find anything obvious in the log. It may be worth trying the proprietary driver released by AMD from the Additional Drivers applications like @user176105 mentioned. — David Foerster, Jul 15 '16 at 22:07

Ubuntu 16.04 distorted loading image and Graphic after unlock

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