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I downloaded and installed the 12.04 beta 2 64-bit desktop edition, after
installation upgraded to April 11, 2012.
I have an NVIDIA 6200 card. DVI out is connected to the HDMI input of a Samsung
TV capable of Full HD resolution @60Hz non-interlaced, which worked perfectly
with the same graphics card on MythBuntu 11.04 32-bit.
The problem:
When the service lightdm is started, and the screen mode is set to
1920x1080@50Hz interlaced after a second or so - the TV claims
that it cannot display this mode.
Details:
Ubuntu starts with a purple screen on 1920x1080@60Hz NI. For example fsck
displays perfectly in this screen.
As I can see from Xorg.log files, the screen resolution is first set to
"nvidia-auto-select" which seems to work well.
Then, after a second or so, "something" seems to switch modes once again, to
the illegal mode.
Creating a new Xorg.conf using nvidia-xconfig does not improve anything. Again,
first the correct mode is detected by DPMS, and set... and then after a second,
the mode is changed to interlaced @50Hz.
Same results if I stop and restart the service "lightdm" from the
console.
Could it be an issue with xrandr? I did not find any documentation in
the Wiki about additional configuration files to configure video modes,
or other software packages that change video modes after the X server
has already been started, so I am stuck.
I searched the whole directory "/etc/X11" for files that contain
anything noticable, nothing...
I think end users should not be confronted with this kind of stuff,
newly installed system must show a picture anyhow, so I consider this a
bug to be fixed in the distribution.
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: dvi nvidia samsung xorg xrandr
--
Nvidia mode is set to an incompatible mode, xorg.conf ignored
https://bugs.launchpad.net/bugs/978937
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