The revision number may not be shown on admin_info page because the execution of the svn command fails in some cases.

Redmine::VERSION::revision method should take @scm_subversion_command@ setting into account.

Index: lib/redmine/version.rb
===================================================================
--- lib/redmine/version.rb  (revision 17354)
+++ lib/redmine/version.rb  (working copy)
@@ -17,7 +17,7 @@
       if File.directory?(File.join(Rails.root, '.svn'))
         begin
           path = Redmine::Scm::Adapters::AbstractAdapter.shell_quote(Rails.root.to_s)
-          if `svn info --xml #{path}` =~ /revision="(\d+)"/
+          if `#{Redmine::Scm::Adapters::SubversionAdapter.client_command} info --xml #{path}` =~ /revision="(\d+)"/
             return $1.to_i
           end
         rescue