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79 lines
2.1 KiB
Markdown
79 lines
2.1 KiB
Markdown
---
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lang: en
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layout: doc
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permalink: /doc/hvm-troubleshooting/
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ref: 232
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title: HVM troubleshooting
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---
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## HVM pauses on boot, followed by kernel error
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The HVM may pause on boot, showing a fixed cursor.
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After a while a series of warnings may be shown similar to this:
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```
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BUG: soft lockup - CPU#0 stuck for 23s! [systemd-udevd:244]
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```
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To fix this:
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1. Kill the HVM.
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1. Start the HVM
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1. Press "e" at the grub screen to edit the boot parameters
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1. Find the /vmlinuz line, and edit it to replace "rhgb" with "modprobe.blacklist=bochs_drm"
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1. Press "Ctrl-x" to start the HVM
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If this solves the problem then you will want to make the change permanent:
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1. Edit the file `/etc/default/grub`.
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1. Find the line which starts:
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~~~
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GRUB_CMDLINE_LINUX=
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~~~
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1. Remove this text from that line:
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~~~
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rhgb
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~~~
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1. Add this text to that line:
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~~~
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modprobe.blacklist=bochs_drm
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~~~
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1. Run this command:
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~~~
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grub2-mkconfig --output=/boot/grub2/grub.cfg
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~~~
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The HVM should now start normally.
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## Can't start an OS in an HVM / "Probing EDD (edd=off to disable!... ok" message
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If you see a screen popup with SeaBios and 4 lines, last one being `Probing EDD (edd=off to disable!... ok`, then enter the following command from a `dom0` prompt:
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```sh
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qvm-prefs <HVMname> kernel ""
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```
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## HVM crashes when booting from ISO
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If your HVM crashes when trying to boot an ISO, first ensure that ` qvm-prefs <HVMname> kernel` is empty, as shown above.
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If this doesn't help, then disable memory balancing and set the minimum memory to 2GB.
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You can disable memory-balancing in the settings, under the “Advanced” tab.
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To give the VM a RAM of 2GB, open a terminal in `dom0` and enter:
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```sh
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qvm-prefs <HVMname> memory 2000
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```
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## Attached devices in Windows HVM stop working on suspend/resume
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After the whole system gets suspended into S3 sleep and subsequently resumed, some attached devices may stop working. To know how to make the devices work, see [Suspend/resume Troubleshooting](/doc/suspend-resume-troubleshooting/#attached-devices-in-windows-hvm-stop-working-on-suspendresume).
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