945GM second display is recogniced newly every few seconds

[Casandro]

Binary package hint: xserver-xorg-video-intel

HP Compaq nx6310 (laptop)
Whenever I connect a monitor to the VGA output, it will turn black for a second every few seconds. This problem is independant of the monitor I use and still happens if I regenerate the sync signals.

/var/log/Xorg.0.log has the following lines added every time that happens.
(II) intel(0): EDID vendor "MAX", prod id 1754
(II) intel(0): EDID vendor "LPL", prod id 47872
(II) intel(0): Printing DDC gathered Modelines:
(II) intel(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz)
(II) intel(0): EDID vendor "LPL", prod id 47872

When I use xrandr to turn off the primary display, the VGA output works.

[Casandro (casandro)]

The bug does not appear at the login screen.
I'm using KDE4.

[kgoeser (kevin-kevin-online)]

Same problem here. I disabled DDC for a try: the flickering persisted and Xorg logged on every flicker a message of DDC not being enabled. When starting X with the monitor attached, the bug appears after the login (not in KDM). I suppose this bug is somewhere in KDE but occurs only in conjunction with the intel driver.

[kgoeser (kevin-kevin-online)]

I just discovered bug #278471 - I think this one might be a duplicate of if. At least the work around of switching off KDE's service for "Detecting RANDR (monitor) changes" solved the problem for me.

[Casandro (casandro-lion)]

Oh yes, I think it's the same bug. The fix works for me, too.