Same problem.
Something information.

# lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor 
Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Thames [Radeon HD 7500M/7600M Series] (rev ff)

# cat /sys/kernel/debug/vgaswitcheroo/switch
0:DIS: :DynOff:0000:01:00.0
1:IGD:+:Pwr:0000:00:02.0

I can't shutdown Radeon.

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https://bugs.launchpad.net/bugs/1304912

Title:
  Ubuntu 14.04 laptop uses lot of power switchable graphics

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