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debian, ubuntu under KVM really slow

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I can’t remember where I found this, so, if you are the original author of this solution, say hello, with the original link 🙂

If you install a debian or an ubuntu, you can experience some bad perf.

I use virt-manager to manage my vm’s.

Simple file with some options for the QXL driver fix the problem.

nano /usr/share/X11/xorg.conf.d/qxl.conf

Inside the file :

Section "Device"
    Identifier "qxl"
    Driver "qxl"
    Option "ENABLE_SURFACES" "False"
EndSection

And reboot !

 

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