let me make a guess.   since it differs at the distro level (debian vs redhat, 
as indicated in the dmesg output), i guessed there is nothing wrong at the 
kernel level.   auto-loading of hardware drivers are done by udev....perhaps it 
is not configured by the OS during installation?   u may need to add it 
manually at the udev level.

 
and to prove that both the kernel can detect the hardware, perhaps u can issue 
"lsusb -v" and both output should be the same?Thanks for your reply
Both the kernels are working in same distro - Debian Lenny, Thats is why i cant 
find out the error, when the kernel A boots its detects the audio devices and 
loads the snd-hda-codec-realtek, but kernel B doesnot detects that audio device 
only but its loading network modules and other necessary modules 
correctly-Welkin-


      

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