Red Hat Bugzilla – Bug 864074
race causes dpms to enter inconsistent state
Last modified: 2014-06-18 05:15:58 EDT
Description of problem: While debugging.a kde powerdevil problem I discovered a way to confuse X11 into thinking that the screen is off when it's really on. This seems to be a race between XForceScreenSaver (called via dbus) and DPMSForceLevel. How reproducible: $ xset dpms force off; qdbus org.freedesktop.ScreenSaver /ScreenSaver org.freedesktop.ScreenSaver.SimulateUserActivity ; xset -q | tail -4; sleep 5; xset -q | tail -4 DPMS (Energy Star): Standby: 480 Suspend: 720 Off: 960 DPMS is Enabled Monitor is Off DPMS (Energy Star): Standby: 480 Suspend: 720 Off: 960 DPMS is Enabled Monitor is Off But the screen is on (it blanked and then came back on after a second or so - normally it would blank and turn itself off after a few seconds). Furthermore the screen doesn't turn off after the DPMS Standby time From kde-workspace/krunner/screensaver/saverengine.cpp: void SaverEngine::SimulateUserActivity() { XForceScreenSaver( QX11Info::display(), ScreenSaverReset ); if ( mXAutoLock && mState == Waiting ) { mXAutoLock->resetTrigger(); } else if (mLockProcess) { ::kill(mLockProcess->pid(), SIGUSR1); } } Version-Release number of selected component (if applicable): kde-workspace-4.8.5-2.4.fc16.x86_64 libX11-1.4.3-1.fc16.x86_64 libXext-1.3.0-1.fc16.x86_64 xorg-x11-server-utils-7.5-7.fc16.x86_64 xorg-x11-drv-ati-6.14.3-4.20120201git36c190671.fc16.x86_64
I can reproduce this on two amd graphics desktops but not on an nvidia-powered laptop (albeit with different package versions on each desktop and the F17 live image on the laptop). 'lspci | grep VGA': 01:05.0 VGA compatible controller: ATI Technologies Inc RS880 [Radeon HD 4290] 00:01.0 VGA compatible controller: ATI Technologies Inc AMD Radeon HD 6310 GraphicsATI 01:00.0 VGA compatible controller: nVidia Corporation G73 [GeForce Go 7600] (rev a1)
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