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I have a kvm guest instance of Ubuntu 14.04 running with a vga type video device. I do not have a /etc/X11/xorg.conf file, I am letting X autoconfigure the video and all devices. When X comes up, the screen resolution is only 800x600. The expected resolution is 1280x768.

I used to get the correct resolution before upgrading to 14.04. The 14.04 guest image was originally cloned from a 13.10 kvm guest instance. When I boot the 13.10 guest now, I still get the correct 1280x768 resolution.

It seems like something has changed for the worse between 13.10 and 14.04, any ideas if this is expected (do I now need xorg.conf?) or should be reported as a bug?

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I'm new with Ubuntu and I have a similar situation. I run Ubuntu 14.04 with a SyncMaster 225uw that's not recognized by the system. However, when running manual commands through the terminal I can reach the max resolution in my monitor.

If you use (I found it in some post with similar issue, but without KVM):

xrandr --newmode "1680x1050_60.00" 147.14 1680 1784 1968 2256 1050 1051 1054 1087 -HSync +Vsync
xrandr --addmode VGA1 1680x1050_60.00

where VGA1 is my monitor.

You will be able to see the resolution available at displays. However, as soon as you restart the machine, the resolution also disappears. I have tried to create a xorg.conf file and so many other alternatives, but it seems as it does not work on Ubuntu 14.04.

Hope that someone can help us!

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