Re: Atomic KMS API lacks the ability to set cursor hot-spot coordinates

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 3/19/20 12:35 PM, Michel Dänzer wrote:
> On 2020-03-18 4:22 p.m., Simon Ser wrote:
>>>
>>> On 3/18/20 3:38 PM, Simon Ser wrote:
>>>>
>>>>> 1) Letting the VM-viewer window-system draw the cursor as it normally
>>>>> would draw it.
>>>>
>>>> Why is this important? Can't the VM viewer hide the cursor and use a
>>>> sub-surface to manually draw the cursor plane configured by the guest?
>>>
>>> Because then moving the cursor as seen by the user requires a round trip
>>> through the VM and that adds latency, esp. when the VM viewer is viewing
>>> a VM which is running somewhere else over the network.
>>
>> The video output has latency anyway.
> 
> Sounds like you've never tried the two different modes yourself? :) IME
> it makes a big difference even with a local VM. Even very little latency
> can make the cursor feel awkward, like it's being held back by a rubber
> band or something.

Right not to mention that the latency may be variable, so the cursor
moves in a jittery fashion instead of having it move smoothly
matching the smooth way a user normally moves the mouse.

This totally wrecks hand-eye coordination and is just plain awefull.

Regards,

Hans

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