Public bug reported:

While trying to identify why X11 is consuming most of the cpu while
running lightdm, I found that currently perf is broken as 'perf top'
shows nothing at the screen.

Kernel:
linux-image-3.2.0-1408-omap4     3.2.0-1408.11
linux-ti-omap4-tools-3.2.0-1408   3.2.0-1408.11

Image: ARMHF Daily from Mar 15/2012 (Pandaboard 4430).

Current output:
# perf_3.2.0-1408 top


   PerfTop:       0 irqs/sec  kernel:-nan%  exact:  nan% [1000Hz cycles],  
(all, 2 CPUs)
-------------------------------------------------------------------------------

exiting.

** Affects: linux-ti-omap4 (Ubuntu)
     Importance: Medium
         Status: Confirmed

** Changed in: linux-ti-omap4 (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux-ti-omap4 (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/956693

Title:
  Broken perf with Ubuntu-3.2.0-1408.11 at Pandaboard

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