On Tuesday 07 April 2009, Lowell Alleman wrote: > Are there any known issues with DPMS not working properly with the latest > radeon driver? I've found some old bugs that sound similar, but don't > exactly match and the workarounds I've found seem to make a difference. > Here is what I'm experiencing: > > My laptop (IBM T42, r300) LCD will not going into power saving mode on > its own. If I force it go into one of these modes, it only stays in that > mode for a short period of time (a few seconds to a couple of minutes) > before the screen turns back on again. I'm pretty sure this isn't due to > any keyboard/mouse events (since the screen saver doesn't > pop up a login dialog) and I don't see any new events /var/log/acpid that > correlate to the LCD being re-enabled. However, every time the LCD turns > back on, I do see the following message in the Xorg.0 log file: "enable > LVDS". It appears that the X server still thinks that the DPMS mode is > enabled, because "xset q" says that the monitor is still in "Suspend" (or > whatever mode I forced it to be in) even after the LCD was turned on > again. > > > Here are some additional details about my setup, and what I've tried: > > Relevant output from "xset q": > DPMS (Energy Star): > Standby: 600 Suspend: 660 Off: 1200 > DPMS is Enabled > Monitor is On > > After the display has been disabled using "xset force suspend" the > display shuts down. If you check "xset q" it now reports "Monitor is in > Suspend". A minute or so later the LCD is turned back on. Now I can see > screensaver (which is DPMS-aware, and therefore has been paused to save > CPU cycles). At this point, "xset q" still shows "Monitor is in > Suspend". > > I've tried switching between EXA and XAA acceleration. As of radeon > v6.12.0 XAA says it is not supported any more, but EXA doesn't appear to > be the default yet. (Not sure what that means; but in both cases this > problems still occurs). I've also tried adding the "NoPM" option, as I > found as an old workaround suggested, but that didn't make a difference > either. > > > Versions: > > X.Org X Server 1.5.2 > Radeon driver: 6.12.0 (I compiled this locally for improved > performance in latest release) > Linux 2.6.27-11-generic #1 SMP Thu Jan 29 19:24:39 UTC 2009 i686 > GNU/Linux Kubuntu 8.10 > KDE 4.1.4 > > I can provide additional info (xorg.conf and Xorg.0.log) if this is an > unknown situation and those would be helpful to have. > > Thanks, > > - Lowell
Hi Lowell, this was a bug in the KDE 4 screensaver code [0]. It is certainly fixed in the latest version of KDE. Try updating to KDE 4.2.1 or above. HTH, Magnus [0] http://bugs.kde.org/show_bug.cgi?id=165265
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