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Your mileage with the virtual procfs filesystem may vary depending on the kernel version and system architecture (i386).
What are you using or comparing?
As far as I know, the current UEK 2 kernel is based on the mainline Linux kernel version 3 (2.6.39). Perhaps it explains the issue you are experiencing. Kernel 2.6 marks the beginning of sysfs (/sys), which apparently does a better job for showing device information than the legacy procfs. The use of procfs is depreciated, but kept for compatibility reasons.
The following article should provide some more details: