[Bug 21321] New: Vblank interrupt increase during 'dpms off'

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=21321

           Summary: Vblank interrupt increase during 'dpms off'
           Product: xorg
           Version: 7.4
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: osos at openeyes.dk
         QAContact: xorg-team at lists.x.org


Radeon driver: 6.12.1 - Ubuntu Jaunty version

Using powertop to measure wakeups.

During normal mode, cpu enters c3-c4 states to save power.
Approx. 10 wakeups/s.

During screenblank this increases to approx 60/s.
running 'xset dpms force off'

Thus not letting the cpu enter c3-c4 states !

Hardware: Thinkpad T42, radeon 7500.


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