Public bug reported:
Thinkpad X41 laptop, with intel 915GM/GMS/910GML, with Intrepid Kubuntu
up to date at the moment I'm posting this.
Using an external VGA screen with LVDS at the same time causes the VGA
screen to blink / flicker every 6-8 seconds (just gets black completely,
and gets back less then a second later).
I'm attaching my Xorg.0.log , but the three following lines always appear when
the screen flashes:
(II) intel(0): EDID vendor "ACR", prod id 9
(II) intel(0): I2C device "LVDSDDC_C:ddc2" registered at address 0xA0.
(II) intel(0): I2C device "LVDSDDC_C:ddc2" removed.
For example,
/usr/bin/xrandr --output VGA --auto --left-of LVDS
gives me the twin view setup (with just a line Virtual added in my xorg.conf,
although it did do that with the pristine xorg automatically built up by dpkg).
It does the same with --same-as options.
It does not flicker when using only VGA, or only using LVDS (using
xrandr --output VGA --auto --output LVDS --off or the other way around)
The bug may seem similar to other bugs (like #275152), but the main
issue here is that it is a regression, as this kind of setup was
perfectly working under Hardy before the upgrade.
I upgraded to Intrepid since October 14th , and it's been doing this
since (even with the multiple xorg / video-intel) upgrades.
A workaround (not a solution ! this is not a normal behaviour) is to
stop "Detecting RANDR (monitor) changes" in KDE settings like described
in bug #278471
After doing that, screen stops blinking , whatever the setup is. I post
the bug in xserver-xorg-video-intel , not sure if it is really a
hardware bug or what.
Willing to test whatever needed to solve the issue for a standard setup
that will work out-of-the-box for those poor Kubuntu Intrepid people
that will have my kind of video hardware (that seem to be common).
** Affects: xserver-xorg-video-intel (Ubuntu)
Importance: Medium
Status: Triaged
** Tags: regression
--
External VGA blinks every 7 seconds with both outputs enabled
https://bugs.launchpad.net/bugs/287128
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