[drm] failed to load kernel module "radeon" - Where to find that module?!

[Strong]

I found in my Xorg.0.log the following:

...
(II) do I need RAC?  No, I don't.
(II) resource ranges after preInit:
        [0] 0   0       0xfe9f0000 - 0xfe9fffff (0x10000) MX[B]
        [1] 0   0       0xf0000000 - 0xf7ffffff (0x8000000) MX[B]
...
        [29] -1 0       0x0000c000 - 0x0000c0ff (0x100) IX[B](B)
        [30] 0  0       0x000003b0 - 0x000003bb (0xc) IS[B](OprU)
        [31] 0  0       0x000003c0 - 0x000003df (0x20) IS[B](OprU)
(WW) RADEON(0): Failed to set up write-combining range
(0xf0000000,0x8000000) (II) RADEON(0): Dynamic Clock Scaling Disabled
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is -1, (Unknown error 999)
drmOpenDevice: open result is -1, (Unknown error 999)
drmOpenDevice: Open failed
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is -1, (Unknown error 999)
drmOpenDevice: open result is -1, (Unknown error 999)
drmOpenDevice: Open failed
[drm] failed to load kernel module "radeon"
(II) RADEON(0): [drm] drmOpen failed
(EE) RADEON(0): [dri] DRIScreenInit failed.  Disabling DRI.
(II) RADEON(0): Memory manager initialized to (0,0) (1280,8191)
(II) RADEON(0): Reserved area from (0,1024) to (1280,1026)
(II) RADEON(0): Largest offscreen area available: 1280 x 7165
(II) RADEON(0): Render acceleration disabled
(II) RADEON(0): Using XFree86 Acceleration Architecture (XAA)
...

Where I should obtain that module? Is ts Xorg's one? Or I forgot to
compile it in my kernel? If so, where in menu config I check the
proper item? Also, I've found the following on my system:

/usr/X11R6/lib/modules/drivers/radeon_drv.o
/usr/X11R6/lib/modules/dri/radeon_dri.so

Is there the one?!
Big thanks in advance!

-- 
Best regards,
Strong.