I think multiple bugs are getting mixed together.
See bug 397839.

According to Bryce at that bug report, xorg has been properly patched
with both patches that Richard Hughes requests.

gnome-power-manager is at a version where its fix is included.

So xorg says the bug is invalid since they have the patches and
gnome-power-manager says the bug in in xorg.

From the number of reports that are coming in on both bugs, it appears
that the reality is that DPMS and blanking problems do remain.

On Wed, Sep 23, 2009 at 11:12 AM, Jeremy Nickurak
<email address hidden> wrote:
> Upstream gnome is about to close this, because they're saying it's an
> Xorg issue. Why is it marked invalid here?
>
> --
> Karmic upgrade not shutting off backlight after time
> https://bugs.launchpad.net/bugs/413168
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in Gnome Powermanager: Unknown
> Status in “gnome-power-manager” package in Ubuntu: Confirmed
> Status in “xorg-server” package in Ubuntu: Invalid
>
> Bug description:
> Binary package hint: gnome-power-manager
>
> Upon upgrade from ibex->jaunty->karmic yesterday, I'm finding gnome-power-manager is shutting off the display after the timed interval as it used to.  I have tried a recursive-unset on gpm and resetting the timeout value to no benefit.  Launching gpm in verbose shows nothing before/after the timeout period.  Possibly relate is the screensaver is also not coming on after the set interval, so possibly something is preventing both from becoming "idle".
>
> Here is the output of gnome-power-bugreport:
>
> Distro version:       squeeze/sid
> Kernel version:       2.6.31-5-generic
> g-p-m version:        2.27.5
> HAL version:          0.5.13
> System manufacturer:  missing
> System version:       missing
> System product:       missing
> AC adapter present:   yes
> Battery present:      yes
> Laptop panel present: yes
> CPU scaling present:  yes
> Battery Information:
>  battery.charge_level.current = 79786  (0x137aa)  (int)
>  battery.charge_level.design = 86580  (0x15234)  (int)
>  battery.charge_level.last_full = 79786  (0x137aa)  (int)
>  battery.charge_level.percentage = 100  (0x64)  (int)
>  battery.charge_level.rate = 11  (0xb)  (int)
>  battery.is_rechargeable = true  (bool)
>  battery.model = 'DELL PU5568'  (string)
>  battery.present = true  (bool)
>  battery.rechargeable.is_charging = false  (bool)
>  battery.rechargeable.is_discharging = false  (bool)
>  battery.reporting.current = 7800  (0x1e78)  (int)
>  battery.reporting.design = 7800  (0x1e78)  (int)
>  battery.reporting.last_full = 7188  (0x1c14)  (int)
>  battery.reporting.rate = 1  (0x1)  (int)
>  battery.reporting.technology = 'Li-ion'  (string)
>  battery.reporting.unit = 'mAh'  (string)
>  battery.serial = '20829'  (string)
>  battery.technology = 'lithium-ion'  (string)
>  battery.type = 'primary'  (string)
>  battery.vendor = 'Samsung SDI'  (string)
>  battery.voltage.current = 12480  (0x30c0)  (int)
>  battery.voltage.design = 11100  (0x2b5c)  (int)
>  battery.voltage.unit = 'mV'  (string)
> DeviceKit data:
> Device: /org/freedesktop/DeviceKit/Power/devices/line_power_AC
>  native-path:          /sys/devices/LNXSYSTM:00/device:00/ACPI0003:00/power_supply/AC
>  power supply:         yes
>  updated:              Wed Aug 12 22:55:30 2009 (37109 seconds ago)
>  has history:          no
>  has statistics:       no
>  line-power
>    online:             yes
>
> Device: /org/freedesktop/DeviceKit/Power/devices/battery_BAT0
>  native-path:          /sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0
>  vendor:               Samsung SDI
>  model:                DELL PU5568
>  serial:               20829
>  power supply:         yes
>  updated:              Wed Aug 12 22:55:52 2009 (37087 seconds ago)
>  has history:          yes
>  has statistics:       yes
>  battery
>    present:             yes
>    rechargeable:        yes
>    state:               fully-charged
>    energy:              86.58 Wh
>    energy-empty:        0 Wh
>    energy-full:         86.58 Wh
>    energy-full-design:  86.58 Wh
>    energy-rate:         9.7569 W
>    voltage:             12.536 V
>    percentage:          100%
>    capacity:            92.1538%
>    technology:          lithium-ion
>
> Daemon:
>  daemon-version:  010
>  can-suspend:     yes
>  can-hibernate    yes
>  on-battery:      no
>  on-low-battery:  no
>  lid-is-closed:   no
>  lid-is-present:   yes
> GNOME Power Manager Process Information:
> mb       23769  0.0  0.2  33744 10704 pts/1    S+   08:46   0:00              |   |   \_ gnome-power-manager --no-daemon --verbose
> HAL Process Information:
> 107       2880  0.0  0.1   7108  4476 ?        Ss   Aug12   0:08 /usr/sbin/hald
> root      2946  0.0  0.0   3572  1176 ?        S    Aug12   0:00  \_ hald-runner
> root      2980  0.0  0.0   3644  1144 ?        S    Aug12   0:00      \_ /usr/lib/hal/hald-addon-rfkill-killswitch
> root      2998  0.0  0.0   3640  1072 ?        S    Aug12   0:00      \_ /usr/lib/hal/hald-addon-generic-backlight
> root      3012  0.0  0.0   3648  1056 ?        S    Aug12   0:00      \_ hald-addon-storage: no polling on /dev/sr0 because it is explicitly disabled
> root      3015  0.0  0.0   3660   976 ?        S    Aug12   0:00      \_ /usr/lib/hal/hald-addon-cpufreq
> 107       3016  0.0  0.0   3464  1060 ?        S    Aug12   0:00      \_ hald-addon-acpi: listening on acpid socket /var/run/acpid.socket
> root      3026  0.0  0.0   3676  1304 ?        S    Aug12   0:00      \_ hald-addon-input: Listening on /dev/input/event2 /dev/input/event0 /dev/input/event13 /dev/input/event14 /dev/input/event5 /dev/input/event6 /dev/input/event1 /dev/input/event10 /dev/input/event9 /dev/input/event4
> root     22988  0.0  0.0   3644  1124 ?        S    Aug12   0:00      \_ /usr/lib/hal/hald-addon-leds
>