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Add GUI Troubleshooting

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user/advanced-configuration/gui-configuration.md
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---
layout: doc
title: GUI Configuration and Troubleshooting
permalink: /doc/gui-configuration-and-troubleshooting/
title: GUI Configuration
permalink: /doc/gui-configuration/
redirect_from:
- /doc/gui-configuration/
---
# GUI Configuration and Troubleshooting
# GUI Configuration
## Video RAM adjustment for high-resolution displays
**Problem:** You have a 4K external display, and when you connect it, you can't click on anything but a small area in the upper-right corner.
When a qube starts, a fixed amount of RAM is allocated to the graphics buffer called video RAM.
This buffer needs to be at least as big as the whole desktop, accounting for all displays that are or will be connected to the machine.
By default, it is as much as needed for the current display and an additional full HD (FHD) display (1920×1080 8 bit/channel RGBA).
This logic fails when the machine has primary display in FHD resolution and, after starting some qubes, a 4K display is connected.
The buffer is too small, and internal desktop resize fails.
If the buffer is too small, and internal desktop resize fails.
**Solution:** Increase the minimum size of the video RAM buffer.
To increase the minimum size of the video RAM buffer:
```sh
qvm-features dom0 gui-videoram-min $(($WIDTH * $HEIGHT * 4 / 1024))
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## GUI Troubleshooting
If you can start your VM, but can't launch any applications, then you need to fix the issues from the `VM console`, accessible from xen through:
See [GUI Troubleshooting](/doc/gui-troubleshooting) for issues relating to the Qubes graphical user interface and how to fix them.
```sh
qvm-start <VMname> # Make sure the VM is started
qvm-console-dispvm <VMname>
```
### Tips
#### Disable audited messages
To disable audited messages, you need to edit your VM kernel parameters:
```sh
previous_kernel_parameters=$(qvm-prefs --get <VMname> kernelopts) # Get current kernel parameters
qvm-prefs --set <VMname> kernelopts "<previous_kernel_parameters> audit=0"
```
Then, restart your VM.
Once your troubleshooting is done, don't forget to remove this kernel parameters, it makes troubleshooting VMs not starting easier.

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user/troubleshooting/gui-troubleshooting.md Normal file
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---
layout: doc
title: GUI Troubleshooting
permalink: /doc/gui-troubleshooting/
---
# GUI Troubleshooting
## Can't click on anything after connecting 4k external display ##
When you connect a 4K external display, you may be unable to click on anything but a small area in the upper-right corner.
When a qube starts, a fixed amount of RAM is allocated to the graphics buffer called video RAM.
This buffer needs to be at least as big as the whole desktop, accounting for all displays that are or will be connected to the machine.
By default, it is as much as needed for the current display and an additional full HD (FHD) display (1920×1080 8 bit/channel RGBA).
This logic fails when the machine has primary display in FHD resolution and, after starting some qubes, a 4K display is connected.
If the buffer is too small, and internal desktop resize fails.
The solution to this problem is to increase the minimum size of the video RAM buffer, as explained in [GUI Configuration](/doc/gui-configuration/#video-ram-adjustment-for-high-resolution-displays).
## Screen blanks / Weird computer glitches like turning partially black or black boxes ##
You may encountering seemingly random screen blanking while using Qubes, where the screen will black and shows the logon screen, yet, only the active window will show when you move the mouse or use the keyboard. Sometimes, you will get random black screen or black boxes.
Similarly, while working, the XScreenSaver dialog may pop up (indicating the screen is locked) and the screen goes black. However, the screen is not locked, and you have to move a window to redraw the screen.
If you are experiencing the any of the above sypmtoms, try disabling the window compositor:
Q → System Tools → Window Manager Tweaks → Compositor → uncheck “Enable display compositing”
## Post installation, screen goes black and freezes following LUKS decryption ##
After installing Qubes, you may experience a black screen after entering your LUKS decryption password.
To fix the problem, use your preferred text editor (`nano` works) to edit `/mnt/sysimage/boot/efi/EFI/qubes/xen.cfg`, adding the `efi=no-rs` option to the end of the `options= line`. For example:
~~~
[4.14.18-1.pvops.qubes.x86_64]
options=loglvl=all dom0_mem=min:1024M dom0_mem=max:4096M iommu=no-igfx ucode=scan efi=no-rs
~~~
## Can start VM, but can't launch any applications ##
If you can start your VM, but can't launch any applications, then you need to fix the issues from the `VM console`, accessible from xen through:
```sh
qvm-start <VMname> # Make sure the VM is started
qvm-console-dispvm <VMname>
```
### Disable audited messages ###
During troubleshooting, you may be getting a lot of 'audit' messages which make the log very noisy.
To disable audited messages, you need to edit your VM kernel parameters:
```sh
previous_kernel_parameters=$(qvm-prefs --get <VMname> kernelopts) # Get current kernel parameters
qvm-prefs --set <VMname> kernelopts "<previous_kernel_parameters> audit=0"
```
Then, restart your VM.
Once your troubleshooting is done, don't forget to remove this kernel parameters, it makes troubleshooting VMs not starting easier.