Same issue here.
After upgrade to 12.10. Logkeys stopped working.

Even selecting the correct "/dev/input/event" I've got an empty log file

Same problem on Kubuntu 13.04. Empty log file. Worked fine in 12.04. 

Any news for this issue? since April looking for a solution for this issue, but 
impossible to work ! even using the correct /dev/input/event logkeys generates 
empty log file ! why we don't have answers from the project?

get the new source:
git clone https://code.google.com/p/logkeys/

I can confirm that building the latest source fixes the empty log issue. 
However, the logged keys are not correct. For example, if I type "cat 
logkeys.log", then I get "z܂t kofjeyamkof". You can see that some keys work 
and some are shifted one to the left.

[deleted comment]

13.04
0.1.1a ("Reading state information... Done
logkeys is already the newest version.")

output file empty. have confirmed keyboard is /dev/input/event0. 
manually setting -d (as the program throws an error with just -s on my usb), 
the file is still empty. 
followed steps in read me, follow test.log traces keys just fine. 
cat /dev/input/device0 also confirms correct device entered. 

I tried changing the output file, still returns an empty log, no matter where 
it is placed.

If I can provide any additional needed detail, please advise, thank you. 

:~$ sudo strace logkeys -s -d /dev/input/event0
execve("/usr/bin/logkeys", ["logkeys", "-s", "-d", "/dev/input/event0"], [/* 17 
vars */]) = 0
brk(0)                                  = 0x2667000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7fc5563e4000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=86515, ...}) = 0
mmap(NULL, 86515, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fc5563ce000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/usr/lib/x86_64-linux-gnu/libstdc++.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\274\5\0\0\0\0\0"..., 
832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=975216, ...}) = 0
mmap(NULL, 3155200, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 
0x7fc555ec1000
mprotect(0x7fc555fa6000, 2093056, PROT_NONE) = 0
mmap(0x7fc5561a5000, 40960, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xe4000) = 0x7fc5561a5000
mmap(0x7fc5561af000, 83200, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc5561af000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@*\0\0\0\0\0\0"..., 832) 
= 832
fstat(3, {st_mode=S_IFREG|0644, st_size=88408, ...}) = 0
mmap(NULL, 2184248, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 
0x7fc555cab000
mprotect(0x7fc555cbf000, 2097152, PROT_NONE) = 0
mmap(0x7fc555ebf000, 8192, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14000) = 0x7fc555ebf000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260\37\2\0\0\0\0\0"..., 
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1848024, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7fc5563cd000
mmap(NULL, 3961912, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 
0x7fc5558e3000
mprotect(0x7fc555aa1000, 2093056, PROT_NONE) = 0
mmap(0x7fc555ca0000, 24576, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1bd000) = 0x7fc555ca0000
mmap(0x7fc555ca6000, 17464, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc555ca6000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\240V\0\0\0\0\0\0"..., 
832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=1067424, ...}) = 0
mmap(NULL, 3162440, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 
0x7fc5555de000
mprotect(0x7fc5556e1000, 2097152, PROT_NONE) = 0
mmap(0x7fc5558e1000, 8192, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x103000) = 0x7fc5558e1000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7fc5563cc000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7fc5563ca000
arch_prctl(ARCH_SET_FS, 0x7fc5563ca740) = 0
mprotect(0x7fc555ca0000, 16384, PROT_READ) = 0
mprotect(0x7fc5558e1000, 4096, PROT_READ) = 0
mprotect(0x7fc555ebf000, 4096, PROT_READ) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7fc5563c9000
mprotect(0x7fc5561a5000, 32768, PROT_READ) = 0
mprotect(0x60c000, 4096, PROT_READ)     = 0
mprotect(0x7fc5563e6000, 4096, PROT_READ) = 0
munmap(0x7fc5563ce000, 86515)           = 0
geteuid()                               = 0
brk(0)                                  = 0x2667000
brk(0x2688000)                          = 0x2688000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=7212544, ...}) = 0
mmap(NULL, 7212544, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fc554efd000
close(3)                                = 0
pipe2([3, 4], O_CLOEXEC)                = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, 
child_tidptr=0x7fc5563caa10) = 3700
close(4)                                = 0
fcntl(3, F_SETFD, 0)                    = 0
fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7fc5563e3000
read(3, "keycode   1 = 0x001b          \nk"..., 4096) = 4096
read(3, "\tkeycode  62 = 0x050f          \n"..., 4096) = 4096
read(3, "de 169 =\nkeycode 170 =\nkeycode 1"..., 4096) = 1213
read(3, "", 4096)                       = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
close(3)                                = 0
wait4(3700, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 3700
munmap(0x7fc5563e3000, 4096)            = 0
rt_sigaction(SIGHUP, {0x4045d0, [], SA_RESTORER, 0x7fc55591a0b0}, NULL, 8) = 0
rt_sigaction(SIGINT, {0x4045d0, [], SA_RESTORER, 0x7fc55591a0b0}, NULL, 8) = 0
rt_sigaction(SIGTERM, {0x4045d0, [], SA_RESTORER, 0x7fc55591a0b0}, NULL, 8) = 0
rt_sigaction(SIGCHLD, {SIG_IGN, [], SA_RESTORER, 0x7fc55591a0b0}, NULL, 8) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, 
child_tidptr=0x7fc5563caa10) = 3703
exit_group(0)                           = ?

Build it from source, that should solve the empty files issue but it will might 
cause other problems.

Ok, I believe I found a good tut to perform this but I can't seem to unzip the 
tar. What problems? And should I uninstall the current first? How?

Any update to this issue? i.e. how to get the correct value of captured keys. 

Logkeys was working fine in 12.04 but after upgrade to 13.04, the captured keys 
are all shifted randomly. The logfile text does not make any sense.

I'm pretty sure this project was abandoned.

I've been working on my own version of this here: 
https://github.com/gsingh93/simple-key-logger

Just run 'make' to build it and then `./skeylogger -l logfilepath` to start the 
keylogger. It's definitely not complete yet, but it works.

if you run the latest git version with -u switch, are the keys still wrong?

I just installed logkeys from the latest git source. No problems with install, 
when I selected the right device and used the full variable addresses the 
problem was fixed.

sudo logkeys --start --keymap=/home/geo/en_GB.map --output=/home/geo/test.log 
--device=/dev/input/event4

Ubuntu Version 13.04
Hopefully this has helped someone.

Just have the same problem. 
The log file is completely empty, not even logging start or stop. 
I'm running ubuntu 13.04
sudo logkeys -s -u -o /home/test.log
any news ?

[deleted comment]

I found great issue with trying to obtain results using the default log 
location.  I believe the issue is related to permissions of the user, which 
logkeys runs, which is "nobody,"but the log has root user.
However, I found if you are an administrator with rights to other users you can 
redirect to a file on your home directory and everybody's login will be 
recorded there.  Tim was correct above!  Don't use shortcuts or skip the equal 
sign!  Here are the contents of my executable logkeys-start file saving to a 
text file titled "logkeys.log":

#! /bin/bash -e

sudo logkeys --start --us-keymap --output=/home/david/other/logkeys.log

Kubuntu 12.04
I hope this helps! -- cool back ground program

Thanks to this post :
 #11 gsingh2...@gmail.com

his keylogger works like a charm ! Thank you !
I just compile it and it is working out of the box !

May be irrelevant, tried using logkeys and skeylogger, yet outputting file to 
Desktop which is crypted works with neither, no output showing up with 
[permission denied].. set skeylogger output to /var/log/logfile.txt, works 
fine, yet default keymap to us.. logkeys default /var/log/logkeys stays empty, 
so may be very irrelevant..

cd /tmp
git clone https://aur.archlinux.org/logkeys.git logkeys-arch
cd logkeys-arch
less logkeys-stdout.patch