Thanks Christopher but I think my problem is pretty the same as in this
bug report. Looking at the source code provided with Ubuntu 14.04
distribution it seems the reason is just some debug logging switched on
in the kernel file:
linux-source-3.13.0/drivers/gpu/drm/radeon/radeon_display.c
There is radeon_crtc_page_flip function that contains:
DRM_DEBUG_DRIVER("flip-ioctl() cur_fbo = %p, cur_bbo = %p\n",
work->old_rbo, rbo);
The command is called unconditionally. Solution seems to be simply
removing or commenting out above line.
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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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