external monitor blanks on 10 second cycle
Bug #317144 reported by
Charlie Figura
This bug report is a duplicate of:
Bug #278471: Screen flickers or blanks every 10 s with KDE4.
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Affects | Status | Importance | Assigned to | Milestone | |
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xserver-xorg-video-intel (Ubuntu) |
Confirmed
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Undecided
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Unassigned |
Bug Description
Binary package hint: xserver-
System: Ubuntu Intrepid (updated from hardy), up-to-date as of 2009/01/14 on Dell Latitude D620 with Intel 945GM video, 1440x900 display.
Problem: External monitor appears to configure correctly automatically, but blanks to black for about 2 seconds every 10 seconds. About 8 seconds of visibility, 2 seconds of black. 10 second cycle is pretty solid, no creep over long time - about an hour of watching. There DOESN'T appear to be any problems/flicker with the laptop display itself.
/var/log/Xorg.0.log shows no errors (that I can see), and /etc/X11/xorg.conf is effectively empty, nothing particular to my system.
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Are you using KDE? I suspect this is (yet another) duplicate of bug 278471. Basically, a few monitors go black when information about it is being probed (known as DDC or EDID). The current KDE version has a daemon that probes this information every 10 seconds. Some lines are also dumped to Xorg.0.log at the same time, and you seem to have the same lines repeating over and over again in that file (that happens to everyone, see bug 299492, but only some monitors blink).
To verify that this is what happens, you can run Xorg.0. log; sleep 1; done` (without ``)
`while true; do wc -l /var/log/
This will show print the number of lines in Xorg.0.log every second. You can stop it with Ctrl+C. If it increases just when the monitor blinks, it's a good indication that this is the culprit.
Another detail I noticed is that when I run
`sudo get-edid | parse-edid`
(you will need the read-edid package for this) one of the lines I get is
Screen is not blanked during DDC transfer
So it seems the montor has a means to advertise that it is blanked during DDC transfers. Possibly yours will do that.
As a possible workaround, you can take a look at the first comment of bug 296481.
If you don't use KDE or otherwise don't think this is duplicate of bug 278471, please include the output of the command `lspci -vvnn`.