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---
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layout: doc
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title: Linux HVM Tips
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permalink: /doc/linux-hvm-tips/
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redirect_from:
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- /en/doc/linux-hvm-tips/
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- /doc/LinuxHVMTips/
- /wiki/LinuxHVMTips/
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---
Tips for Linux in HVM domain
============================
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How to fix bootup kernel error
-------------------------------
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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.
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Screen resolution
-----------------
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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:
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1. Force "vesa" video driver
2. Provide wide horizontal synchronization range
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To achieve it (all commands to be run as root):
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1. Generate XOrg configuration (if you don't have it):
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~~~
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X -configure :1 & & mv ~/xorg.conf.new /etc/X11/xorg.conf
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~~~
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1. Add HorizSync line to Monitor section, it should look something like:
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~~~
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Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
HorizSync 30.0 - 60.0
EndSection
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~~~
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1. Change driver to "vesa" in Device section:
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~~~
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Section "Device"
# (...)
Identifier "Card0"
Driver "vesa"
VendorName "Technical Corp."
BoardName "Unknown Board"
BusID "PCI:0:2:0"
EndSection
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~~~
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Now you should get resolution of at least 1280x1024 and should be able to choose other modes.
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Qubes agents
------------
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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 ).
