Looking at the description of above macros at ./include/drm/drmP.h the
logging is active only when drm.debug kernel option is set. Indeed I
found this option in my /etc/default/grub file:

GRUB_CMDLINE_LINUX_DEFAULT="plymouth:debug splash quiet drm.debug=0xe"

It seems the option is not default in recent Ubuntu release (at least
14.04), becouse restoring content of the file to default makes the line
look like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

How the drm.debug option did get to the configuration file I don't know.
Maybe this is remainder from prevoius Ubuntu release ant stayed after
upgrade ?

Thus there is no need to recompile kernel modules, just remove the
drm.debug kernel option from /etc/grub/default and regenerate grub
configuration with update-grub.

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https://bugs.launchpad.net/bugs/1326567

Title:
  [Asus M4A88T-M] problem with drm:drm_mode_addfb and
  drm:radeon_crtc_page_flip

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