I did a couple of tests on my setup. First of all, problem seems to disappear if i use the radeon driver instead of fglrx one. Then i ssh-ed in from another machine. This is the output of powertop with screen blank (only first few lines copied, compiz using 100% of a core):
993,3 ms/s 0,0 Process compiz 100,0% Device Codec audio hwC0D1: LSI 100,0% Device Codec audio hwC0D0: IDT 0,9 ms/s 81,6 Timer tick_sched_timer 4,9 ms/s 15,7 Process /usr/lib/indicator-application/indicator-application-service 108,0 µs/s 11,8 Timer hrtimer_wakeup This the same, with screen active: 100,0% Device Codec audio hwC0D1: LSI 100,0% Device Codec audio hwC0D0: IDT 3,5 ms/s 114,9 Timer tick_sched_timer 69,7 ms/s 27,5 Process compiz 1,6 ms/s 44,2 Interrupt [58] fglrx[0]@PCI:1:0:0 0,9 ms/s 37,3 Interrupt [6] tasklet(softirq) 34,8 ms/s 19,6 Process /usr/lib/unity/unity-panel-service 9,4 ms/s 20,6 Process /usr/lib/indicator-application/indicator-application-service 9,0 ms/s 20,6 Process //bin/dbus-daemon --fork --print-pid 5 --print-address 7 --session 620,4 µs/s 16,7 Timer hrtimer_wakeup fglrx interrupts are absent in the first lot. Is this expected? -- You received this bug notification because you are a member of compiz packagers, which is subscribed to compiz in Ubuntu. https://bugs.launchpad.net/bugs/961202 Title: A locked screen (blank screensaver) has compiz generating ca. 40 wakeups/second To manage notifications about this bug go to: https://bugs.launchpad.net/compiz-core/+bug/961202/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : compiz@lists.launchpad.net Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp