I already had ck-launch-session in my .xinitrc. After some research on various threads, I managed to fix my consolekit setup. First I needed to add the lines:

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session optional pam_loginuid.so
session optional pam_ck_connector.so nox11

to the file: /etc/pam.d/login

Second, I needed to set the kernel option:

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CONFIG_AUDITSYSCALL=Y

It is found under general setup.

Now my output from ck-list-sessions looks like:

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Session1:
        unix-user = '1000'
        realname = 'Name'
        seat = 'Seat1'
        session-type = ''
        active = FALSE
        x11-display = ''
        x11-display-device = ''
        display-device = '/dev/tty1'
        remote-host-name = ''
        is-local = TRUE
        on-since = '2012-03-01T16:42:04.311148Z'
        login-session-id = '2'
        idle-since-hint = '2012-03-01T16:42:43.736773Z'
Session2:
        unix-user = '1000'
        realname = 'Name'
        seat = 'Seat1'
        session-type = ''
        active = TRUE
        x11-display = ':0'
        x11-display-device = '/dev/tty5'
        display-device = '/dev/tty1'
        remote-host-name = ''
        is-local = TRUE
        on-since = '2012-03-01T16:42:14.871167Z'
        login-session-id = '2'

I don't use a graphical login manager, but log in to the console and start X by using startx. The first session is my console login, while the second is my X-system.
Now I am the active user, is-local shows TRUE and login-session-id (which was empty before) now shows the correct values. Everything works like a charm now, I can adjust brightness and use restart/shutdown from within KDE.

Meriox: I can see that in your ck-list-sessions output login-session-id is empty, so maybe you need to enable the aforementioned kernel option?

The kernel options has an entry CONFIG_AUDITSYSCALL=Y

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# General setup
#
CONFIG_EXPERIMENTAL=y
CONFIG_INIT_ENV_ARG_LIMIT=32
CONFIG_INIT_PASS_ALL_PARAMS=y
CONFIG_CROSS_COMPILE=""
CONFIG_LOCALVERSION=""
# CONFIG_LOCALVERSION_AUTO is not set
CONFIG_HAVE_KERNEL_GZIP=y
CONFIG_HAVE_KERNEL_BZIP2=y
CONFIG_HAVE_KERNEL_LZMA=y
CONFIG_HAVE_KERNEL_XZ=y
CONFIG_HAVE_KERNEL_LZO=y
CONFIG_KERNEL_GZIP=y
# CONFIG_KERNEL_BZIP2 is not set
# CONFIG_KERNEL_LZMA is not set
# CONFIG_KERNEL_XZ is not set
# CONFIG_KERNEL_LZO is not set
CONFIG_DEFAULT_HOSTNAME="(none)"
CONFIG_VERSION_SIGNATURE="Ubuntu 3.0.0-16.29-generic 3.0.20"
CONFIG_SWAP=y
CONFIG_SYSVIPC=y
CONFIG_SYSVIPC_SYSCTL=y
CONFIG_POSIX_MQUEUE=y
CONFIG_POSIX_MQUEUE_SYSCTL=y
CONFIG_BSD_PROCESS_ACCT=y
CONFIG_BSD_PROCESS_ACCT_V3=y
CONFIG_FHANDLE=y
CONFIG_TASKSTATS=y
CONFIG_TASK_DELAY_ACCT=y
CONFIG_TASK_XACCT=y
CONFIG_TASK_IO_ACCOUNTING=y
CONFIG_AUDIT=y
CONFIG_AUDITSYSCALL=y
CONFIG_AUDIT_WATCH=y
CONFIG_AUDIT_TREE=y
CONFIG_HAVE_GENERIC_HARDIRQS=y

Added at the end of /etc/pam.d/login entry:

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optional session pam_loginuid.so
optional session pam_ck_connector.so nox11

but in my ck-list-sessions output login-session-id is empty

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mariusz@mariusz-SATELLITE-M100:~$ ck-list-sessions
Session1:
        unix-user = '1000'
        realname = 'Mariusz L'
        seat = 'Seat1'
        session-type = ''
        active = TRUE
        x11-display = ':0'
        x11-display-device = '/dev/tty7'
        display-device = ''
        remote-host-name = ''
        is-local = TRUE
        on-since = '2012-03-02T23:26:48.488949Z'
        login-session-id = ''

In the kernel log I found several errors:

03/02/2012 11:00:27 p.m. ACPI BIOS bug: multiple APIC / MADT found, using 0
03/02/2012 11:00:28 p.m. [Firmware Bug] ACPI: BIOS _OSI (Linux) query ignored
03/02/2012 11:00:28 p.m. [Firmware Bug] ACPI: No _BQC method, can not Determine initial brightness
03/02/2012 11:00:28 p.m. Using PCI host bridge windows from ACPI, if Necessary, use "pci = nocrs" and report a bug

Please confirm it is yes with the currently running kernel by running:

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zcat /proc/config.gz | grep CONFIG_AUDITSYSCALL

bcooksley wrote:Please confirm it is yes with the currently running kernel by running:

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zcat /proc/config.gz | grep CONFIG_AUDITSYSCALL

no such file in that directory

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mariusz@mariusz-SATELLITE-M100:~$ zcat /proc/config.gz | grep CONFIG_AUDITSYSCALL
gzip: /proc/config.gz: No such file or directory

never configured the kernel and not compile.
CONFIG_AUDITSYSCALL=Y entry I found in / boot/config-3.0.0-16-generic

It seems /proc/config.gz is not standard or enabled by all distributions. Odd.

As an alternative....

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cat /boot/config-$(uname -r) | grep CONFIG_AUDITSYSCALL

bcooksley wrote:It seems /proc/config.gz is not standard or enabled by all distributions. Odd.

As an alternative....

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cat /boot/config-$(uname -r) | grep CONFIG_AUDITSYSCALL

Answer:

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@ Mariusz Mariusz-SATELLITE-M100: ~ $ cat / boot/config- $ (uname-r) | grep CONFIG_AUDITSYSCALL
CONFIG_AUDITSYSCALL = y

It seems to me that the problem with login-session-id empty does not cause an error with the brightness of the screen.
I checked ck-list-sessions on a notebook from my friend.
At a friend login-session-id is empty, but also adjust the screen brightness using the slider works normally.
Save energy and brightness control in a laptop from my friend working properly.

Are errors in the kernel of the logos are not meaningful?

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03/02/2012 11:00:27 p.m. ACPI BIOS bug: multiple APIC / MADT found, using 0
03/02/2012 11:00:28 p.m. [Firmware Bug] ACPI: BIOS _OSI (Linux) query ignored
03/02/2012 11:00:28 p.m. [Firmware Bug] ACPI: No _BQC method, can not Determine initial brightness
03/02/2012 11:00:28 p.m. Using PCI host bridge windows from ACPI, if Necessary, use "pci = nocrs" and report a bug

Those messages are not necessarily conclusive - as some graphics cards (especially those by Ati and Nvidia) using their own methods for changing the screen brightness.

In any case, your session seems to be marked as active, which is the important part.
When attempting to change the brightness, can you confirm that Polkit is operating correctly? It is likely logging into somewhere in /var/log (this changes depending on distribution however).

bcooksley wrote:Those messages are not necessarily conclusive - as some graphics cards (especially those by Ati and Nvidia) using their own methods for changing the screen brightness.

In any case, your session seems to be marked as active, which is the important part.
When attempting to change the brightness, can you confirm that Polkit is operating correctly? It is likely logging into somewhere in /var/log (this changes depending on distribution however).

I do not know which file is responsible for Polkit but when I press FN+F6 (dimming) and Fn+F7 (brighter) then change the files kern.log and syslog.txt in a directory /var/log


After using the keys brightening/dimming

Output from /var/log/syslog.txt:

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Mar  7 22:54:58 mariusz-SATELLITE-M100 kernel: [   96.678516] iwlagn 0000:03:00.0: Aggregation not enabled for tid 0 because load = 0
Mar  7 22:55:01 mariusz-SATELLITE-M100 kernel: [  100.081276] iwlagn 0000:03:00.0: iwlagn_tx_agg_start on ra = c0:3f:0e:be:c3:4e tid = 0
Mar  7 22:58:53 mariusz-SATELLITE-M100 anacron[973]: Job `cron.daily' started
Mar  7 22:58:53 mariusz-SATELLITE-M100 anacron[1874]: Updated timestamp for job `cron.daily' to 2012-03-07
Mar  7 23:06:25 mariusz-SATELLITE-M100 kernel: [  784.070257] atkbd serio0: Unknown key pressed (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:06:25 mariusz-SATELLITE-M100 kernel: [  784.070266] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:06:25 mariusz-SATELLITE-M100 kernel: [  784.146031] atkbd serio0: Unknown key released (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:06:25 mariusz-SATELLITE-M100 kernel: [  784.146040] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:06:25 mariusz-SATELLITE-M100 kernel: [  784.277965] atkbd serio0: Unknown key pressed (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:06:25 mariusz-SATELLITE-M100 kernel: [  784.277973] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:06:25 mariusz-SATELLITE-M100 kernel: [  784.334499] atkbd serio0: Unknown key released (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:06:25 mariusz-SATELLITE-M100 kernel: [  784.334507] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:06:26 mariusz-SATELLITE-M100 kernel: [  784.456396] atkbd serio0: Unknown key pressed (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:06:26 mariusz-SATELLITE-M100 kernel: [  784.456404] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:06:26 mariusz-SATELLITE-M100 kernel: [  784.513958] atkbd serio0: Unknown key released (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:06:26 mariusz-SATELLITE-M100 kernel: [  784.513965] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:06:26 mariusz-SATELLITE-M100 kernel: [  784.640050] atkbd serio0: Unknown key pressed (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:06:26 mariusz-SATELLITE-M100 kernel: [  784.640058] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:06:26 mariusz-SATELLITE-M100 kernel: [  784.698858] atkbd serio0: Unknown key released (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:06:26 mariusz-SATELLITE-M100 kernel: [  784.698866] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:06:26 mariusz-SATELLITE-M100 kernel: [  784.819503] atkbd serio0: Unknown key pressed (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:06:26 mariusz-SATELLITE-M100 kernel: [  784.819510] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.

Output from /var/log/kern.log:

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Mar  7 23:12:28 mariusz-SATELLITE-M100 kernel: [ 1147.302400] atkbd serio0: Unknown key pressed (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:12:28 mariusz-SATELLITE-M100 kernel: [ 1147.302409] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.386189] atkbd serio0: Unknown key released (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.386199] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.502408] atkbd serio0: Unknown key pressed (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.502417] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.559586] atkbd serio0: Unknown key released (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.559596] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.680664] atkbd serio0: Unknown key pressed (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.680674] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.732787] atkbd serio0: Unknown key released (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.732796] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.851146] atkbd serio0: Unknown key pressed (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.851156] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.904916] atkbd serio0: Unknown key released (translated set 2, code 0xd9 on isa0060/serio0).
Mar  7 23:12:29 mariusz-SATELLITE-M100 kernel: [ 1147.904926] atkbd serio0: Use 'setkeycodes e059 <keycode>' to make it known.

Those keys are likely "hardware keys" for which the BIOS is acting to change the screen brightness.
The error message also indicates that the Kernel is not aware of the appropriate keycodes to handle both buttons.