Are you using the latest libdrm from git?

libdrm:

commit 4a17be4a86cde1065908576e44f3710f6d9d68af
Author: Alex Deucher <alexdeucher@gmail.com>
Date:   Wed Feb 10 19:39:46 2010 -0500
drm: a some new connector types from the kernel

It is the latest ...

(In reply to comment #2)
> libdrm:
> 
> commit 4a17be4a86cde1065908576e44f3710f6d9d68af
> Author: Alex Deucher <alexdeucher@gmail.com>
> Date:   Wed Feb 10 19:39:46 2010 -0500
> drm: a some new connector types from the kernel
> 
> It is the latest ...
> 

Are you sure that's the version you have installed? "nm" should give you something like:
> $ nm /usr/lib/libdrm.so |grep DeviceNameFromFd
> 0000000000007a72 T drmGetDeviceNameFromFd

I built it on openSUSE Build Service ("git pull" on 20100210) and installed it on my system (with -debuginfo and -debugsource packages).

/usr/lib # nm /usr/lib/libdrm.so
nm: /usr/lib/libdrm.so: no symbols

/usr/lib # l *drm*
lrwxrwxrwx 1 root root    21 13. Feb 12:37 libdrm_intel.so -> libdrm_intel.so.1.0.0*
lrwxrwxrwx 1 root root    21 13. Feb 12:31 libdrm_intel.so.1 -> libdrm_intel.so.1.0.0*
-rwxr-xr-x 1 root root 42496 11. Feb 04:08 libdrm_intel.so.1.0.0*
lrwxrwxrwx 1 root root    23 13. Feb 12:37 libdrm_nouveau.so -> libdrm_nouveau.so.1.0.0*
lrwxrwxrwx 1 root root    23 13. Feb 12:31 libdrm_nouveau.so.1 -> libdrm_nouveau.so.1.0.0*
-rwxr-xr-x 1 root root 22064 11. Feb 04:08 libdrm_nouveau.so.1.0.0*
lrwxrwxrwx 1 root root    22 13. Feb 12:37 libdrm_radeon.so -> libdrm_radeon.so.1.0.0*
lrwxrwxrwx 1 root root    22 13. Feb 12:31 libdrm_radeon.so.1 -> libdrm_radeon.so.1.0.0*
-rwxr-xr-x 1 root root 17984 11. Feb 04:08 libdrm_radeon.so.1.0.0*
lrwxrwxrwx 1 root root    15 13. Feb 12:37 libdrm.so -> libdrm.so.2.4.0*
lrwxrwxrwx 1 root root    15 13. Feb 12:31 libdrm.so.2 -> libdrm.so.2.4.0*
-rwxr-xr-x 1 root root 42640 11. Feb 04:08 libdrm.so.2.4.0*


GeForce 2 GTS is NV15 - sorry ...

(In reply to comment #4)
> I built it on openSUSE Build Service ("git pull" on 20100210) and installed it
> on my system (with -debuginfo and -debugsource packages).
> 
> /usr/lib # nm /usr/lib/libdrm.so
> nm: /usr/lib/libdrm.so: no symbols
> 

Right, it's stripped, have you tried "nm -D"?

$ nm -D /usr/lib/libdrm.so | grep DeviceNameFromFd
00002b50 T drmGetDeviceNameFromFd

(In reply to comment #6)
> $ nm -D /usr/lib/libdrm.so | grep DeviceNameFromFd
> 00002b50 T drmGetDeviceNameFromFd
> 

Anything unusual coming out of stderr from your X server?

Created attachment 33324 [details]
kdm.log

"startx -- -verbose 6 -logverbose 6 2> startx.log" generates an empty file.

But I found attached log in "kdm.log" with "broken" commit.

(In reply to comment #8)
> Created an attachment (id=33324) [details]
> kdm.log
> 
> "startx -- -verbose 6 -logverbose 6 2> startx.log" generates an empty file.
> 
> But I found attached log in "kdm.log" with "broken" commit.
> 
> [...]
> /usr/bin/Xorg: symbol lookup error:
> /usr/lib/xorg/modules/drivers/nouveau_drv.so: undefined symbol:
> drmGetDeviceNameFromFd
>

Then /usr/lib/libdrm.so isn't what the linker is pulling in. Are you sure you don't have another libdrm installed somewhere else?

(In reply to comment #9)
> 
> Then /usr/lib/libdrm.so isn't what the linker is pulling in. Are you sure you
> don't have another libdrm installed somewhere else?
> 

There was a second one in /lib/. A "rm -rf /usr/libdrm*" fixed the problem.
(Maybe legacy issues from the time I was young, stupid and much more unexperienced. Nowadays I am only "and" ...)  ;)

Thanks Francisco for your help and patience and sorry for the noise ...