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91 lines
3.4 KiB
Markdown
91 lines
3.4 KiB
Markdown
# Mouse
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There are two modes of pointer device: absolute and relative.
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In absolute mode, the input device transmits the exact coordinates `(X,Y)` where the cursor should be moved. This is how touchscreens or drawing tablets work.
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In relative mode, only the relative offset `(dX,dY)` to the current position is transmitted, which is unknown to the input device itself. This is a regular mouse.
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By default, PiKVM uses absolute positioning mode as the most convenient for the user and software.
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However, this is not always supported by the BIOS/UEFI.
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For such cases, support is provided for the relative mode of operation, which can be enabled in the config.
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When using relative mode, the browser will exclusively capture your mouse when you click on the stream window in PiKVM once.
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When you press `Esc`, the browser releases the mouse.
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## Important notes
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The relative mouse generates a huge number of events that can be poorly transmitted over the network or very slowly perceived by the BIOS/UEFI driver. To solve this problem, mouse events are optimized using a vector sum. This mode is enabled by default and is available in the web menu `System -> Squash mouse moves`. You can try disabling this if you have problems with mouse acceleration. This is the best and most reasonable compromise right now.
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Also currently the relative mouse mode is not supported by [PiKVM VNC server](vnc.md) yet. The reason is that none of the recommended clients support the [QEMU Pointer Motion Change](https://github.com/rfbproto/rfbproto/blob/master/rfbproto.rst#qemu-pointer-motion-change-pseudo-encoding) extension.
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We expect to implement this in [TigerVNC](https://github.com/TigerVNC/tigervnc/issues/619). The relative mode is also not supported by mobile browsers.
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## Relative mouse on v2+ platform (OTG HID)
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### Dual mode
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Using dual mouse mode you can switch between the absolute and relative mouse in the `System` menu without reloading.
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This is more convenient, but for compatibility reasons it is disabled by default. To enable it, do the following:
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1. Switch filesystem to RW-mode using command `rw`.
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2. Edit `/etc/kvmd/override.yaml` and add these lines:
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```yaml
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kvmd:
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hid:
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mouse_alt:
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device: /dev/kvmd-hid-mouse-alt
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```
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3. Perform `reboot`. After that reboot your PC.
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### Single relative mode
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1. Switch filesystem to RW-mode using command `rw`.
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2. Edit `/etc/kvmd/override.yaml` and add these lines:
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```yaml
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kvmd:
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hid:
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mouse:
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absolute: false
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```
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3. Perform `reboot`. After that reboot your PC.
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4. If the mouse is still not detected by the BIOS/UEFI, try disabling horizontal scrolling to achieve the maximum compatibility:
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```yaml
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kvmd:
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hid:
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mouse:
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absolute: false
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horizontal_wheel: false
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```
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5. Don't forget to perform `reboot`.
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## Relative mouse on v0 platform (Arduino HID)
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Mode switching for [Arduino HID](arduino_hid.md) can be performed on-the-fly starting with KVMD 2.6 and the corresponding firmware. No additional actions are required.
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## Fixing the absolute mouse on Windows 98
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Due to an ancient buggy driver, the absolute mouse on Windows 98 moves only within the upper-left quarter of the screen. To fix this, you need to activate some magic workaround in `/etc/kvmd/override.yaml`:
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```yaml
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kvmd:
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hid:
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mouse:
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absolute_win98_fix: true
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```
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... and run `systemctl restart kvmd`.
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