I've got the same trouble.
gnome-power-manager-2.22.1 didn't set DPMS property.
>>>>>> gnome-power-manager --no-daemon --verbose --debug all
.....
[gpm_backlight_sync_policy] gpm-backlight.c:164 (10:31:38): not laptop, so
use GPM_BACKLIGHT_METHOD_STAGGER
[gpm_backlight_sync_policy] gpm-backlight.c:193 (10:31:38): BACKLIGHT
parameters 60 60 120, method '1'
[x11_sync_server_dpms_settings] gpm-dpms.c:130 (10:31:38): Syncing DPMS
settings enabled=1 timeouts=0 0 0
[x11_sync_server_dpms_settings] gpm-dpms.c:187 (10:31:38): set DPMS
timeouts: 0 0 0.
....
When I set timeout with gnome-power-preferences.
So ... it 's normal, because DPMS get unlimited timeout.
I've just change in gpm-dpms.c:350 (sync_settings function)
- if (dpms->priv->active) {
+ if (dpms->priv->enabled) {
==== it's working for me... but I'm waiting the official patch :)
[gpm_backlight_sync_policy] gpm-backlight.c:164 (10:31:38): not laptop, so
use GPM_BACKLIGHT_METHOD_STAGGER
[gpm_backlight_sync_policy] gpm-backlight.c:193 (10:31:38): BACKLIGHT
parameters 60 60 120, method '1'
[x11_sync_server_dpms_settings] gpm-dpms.c:130 (10:31:38): Syncing DPMS
settings enabled=1 timeouts=60 60 120
[x11_sync_server_dpms_settings] gpm-dpms.c:187 (10:31:38): set DPMS
timeouts: 60 60 120.
Dominique
--
DPMS is broken
https://bugs.launchpad.net/bugs/193192
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