Nvidia mode is set to an incompatible mode, xorg.conf ignored
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
nvidia-graphics-drivers (Ubuntu) |
New
|
Undecided
|
Unassigned |
Bug Description
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-
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) → nvidia-graphics-drivers (Ubuntu) |
It appears you know how to get to a terminal. I suggest trying a different DM (e.g. gdm3) to see if the issue is just with lightdm. If possible, run this command to gather the logs:
apport-collect 978937