If the HVM pauses on boot and shows a series of warnings, visit [HVM Troubleshooting](/doc/hvm-troubleshooting/#hvm-pauses-on-boot-followed-by-kernel-error) for a fix.
Some kernel/Xorg combinations use only 640x480 in HVM, which is quite small.
To enable maximum resolution, some changes in the Xorg configuration are needed:
1. Force "vesa" video driver
2. Provide wide horizontal synchronization range
To achieve it (all commands to be run as root):
1. Generate XOrg configuration (if you don't have it):
~~~
X -configure :1 && mv ~/xorg.conf.new /etc/X11/xorg.conf
~~~
1. Add HorizSync line to Monitor section, it should look something like:
~~~
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
HorizSync 30.0 - 60.0
EndSection
~~~
1. Change driver to "vesa" in Device section:
~~~
Section "Device"
# (...)
Identifier "Card0"
Driver "vesa"
VendorName "Technical Corp."
BoardName "Unknown Board"
BusID "PCI:0:2:0"
EndSection
~~~
Now you should get resolution of at least 1280x1024 and should be able to choose other modes.
Qubes agents
------------
Linux Qubes agents are written primarily for PV qubes, but it is possible to run them also in a HVM qube.
However some work may be required to achieve this. Check [this thread](https://groups.google.com/group/qubes-devel/browse_thread/thread/081df4a43e49e7a5).
