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Update mouse.md

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# Mouse modes
There are two modes of mouse operation: absolute and relative.
There are two modes of pointer device: absolute and relative.
In absolute mode, the input device transmits the exact coordinates (X,Y) where the cursor should be moved.
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
In relative mode, only the relative offset (dX,dY) to the current position is transmitted, which is unknown to the input device itself.
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.
By default, Pi-KVM uses absolute positioning mode as the most convenient for the user and software.
However, this is not always supported by the BIOS/UEFI.
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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.
We expect to implement this in [TigerVNC](https://github.com/TigerVNC/tigervnc/issues/619).
:exclamation: This mode is also not supported by mobile browsers.
# Enabling relative mouse on v2 platform (OTG HID)
* Switch filesystem to RW-mode using command `rw`.
* Edit `/etc/kvmd/override.yaml` and add these lines:
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* Don't forget to perform `reboot`.
# Enabling relative mouse on v0 platform (serial HID)
This is not currently supported but will be added in a future release. The reason is that we are working on improving the HID protocol.
:exclamation: This is not currently supported but will be added in a future release. The reason is that we are working on improving the HID protocol.