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From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20041020 Epiphany/1.4.4 Description of problem: For the current Fedora development tree, DPMS is not working properly on an IBM Thinkpad 600e. The chipset is a Neomagic NM2200 [MagicGraph 256AV]. DPMS is enabled in the 'xorg.conf' file and reported to be active, as verified e.g. by typing 'xset -q'. Having executed 'xset dpms 0 0 10', the display should power off after 10 seconds. For an attached external monitor LG1710B, the screen turns blank after 10 seconds, but the status LED remains green, whereas it should turn orange. The same result for various display set-ups, where either the internal or external displays or both simultaneously are used. Using different monitor sections specified as "externdisp" and "interndisp" has not effect on the DPMS functionality as well (although switching displays with customized screen settings works nicely). For some popular Redmond OS, things behave as expected, so it's probably not a hardware defect. Version-Release number of selected component (if applicable): xorg-x11-6.8.1-12 How reproducible: Always Steps to Reproduce: 1. Boot Fedora rawhide. 2. Change DPMS settings by typing 'xset dpms 0 0 10'. 3. Type 'xset -q' to verify that the settings have been changed accordingly. 4. Wait 10 seconds to watch the display turn blank and the status LED stay green. Actual Results: The display does not power off. Expected Results: The display should have powered off and the status LED should have turned orange. Additional info: This never worked for FC2, but I am pretty sure that this worked for some of the FC3 test releases, in particular FC3 test 1 and probably FC3 test 3 as well.
Created attachment 105932 [details] X.Org X11 6.8.1 configuration file
DPMS of the external L1710B display is definitely working for FC1. For the current FC3RC3 setup, changing the video driver from 'neomagic' to 'vesa' allows to recover the correct behaviour.
Ok, there has been some progress on this issue. Running the "apmiser" power saving daemon which is part of the (3rd party) "tpctl" utility is responsible of disabling the "power off" capability completely. The reported bug is apparently due to its interference with the DPMS functionality of X. It is not obvious though which component to hold liable for this, even a hardware problem may be at the origin of this malfunction. Disabling "apmiser" restores the "power off" capability. However, even then, the DPMS settings are not strictly respected, at least as far as the timing is concerned. The monitor will definitely go to "power off" mode after some time, but not necessarily the time chosen through "xscreensaver" or by means of "xset dpms ..." in contrast with the "vesa" driver functionality where things work predictably.
Since this bugzilla report was filed, there have been several major updates to the X Window System, which may resolve this issue. Users who have experienced this problem are encouraged to upgrade to the latest version of Fedora Core, which can be obtained from: http://fedora.redhat.com/download If this issue turns out to still be reproduceable in the latest version of Fedora Core, please file a bug report in the X.Org bugzilla located at http://bugs.freedesktop.org in the "xorg" component. Once you've filed your bug report to X.Org, if you paste the new bug URL here, Red Hat will continue to track the issue in the centralized X.Org bug tracker, and will review any bug fixes that become available for consideration in future updates. Setting status to "CURRENTRELEASE".