I have a laptop Acer TravelMate 3043WTMi under Lenny AMD64 with 4GD RAM. But the system "see" only 3GB: dmesg |grep Memory [ 0.004000] Memory: 3081184k/3136000k available (2225k kernel code, 54428k reserved, 1080k data, 392k init) $ cat /proc/meminfo MemTotal: 3088108 kB How can I get all my 4GB memory?