XenServer Host Console Not Visible On Some High-Resolution Monitors
Article ID: CTX226191
Updated On:
Description
Due to resolution incompatibility issues on some high-resolution monitors the host console may not be visible when booted
The following monitors have been confirmed to have this issue:
-
Dell, U2312HM, 23", 16:9, 1920 x 1080
-
Philips, 226V6QSB6, 21.5", 16:9, 1920X1080
-
AOC, I2280SWD, 22", 16:9, 1920X1080
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SAMSUNG S23B350T 23" 16:9
Resolution
To solve this issue you must be able to access the host. Either temporarily use an alternative monitor or connect to the host remotely (through ssh or serial).
After connecting to the host follow these steps:
After connecting to the host follow these steps:
- Identify the correct vga settings for your monitor resolution. By default, they are set to “vga=mode-0x0311” and “vga=785”.
- For a resolution of 1024x768 change 0x311 --> 0x317 and vga=785 --> vga=791
- For alternative resolutions the vga mode options can be found at: https://lists.debian.org/debian-user/2006/09/msg00532.html and https://en.wikipedia.org/wiki/VESA_BIOS_Extensions#Linux_video_mode_numbers (Linux video modes numbers section)
- Edit the vga settings in the grub config using xen-cmdline, for example:
- /opt/xensource/libexec/xen-cmdline --set-xen vga=mode-0x0317
- /opt/xensource/libexec/xen-cmdline --set-dom0 vga=791
- Reboot the system
Issue/Introduction
Due to resolution incompatibility issues on some high-resolution monitors the host console may not be visible when booted.
Additional Information
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