[amdgpu][tahiti xt] cursor motion smoothness

[Michel Dänzer]

On 2018-07-02 10:10 PM, sylvain.bertrand at gmail.com wrote:
> On Mon, Jul 02, 2018 at 06:43:48PM +0200, Michel Dänzer wrote:
>>> Sending the logs as direct email to your personal email box.
>>
>> Does using xf86-input-libinput instead of xf86-input-evdev help?
> 
> I did plan to switch to libinput in the futur, but:
> 
> I did test the xinput events and I get for a reasonable mouse motion speed an
> update of coords for each column of the screen (full hd).
> 
> It means that the cursor is supposely displayed for nearly all columns of the
> screen. For a fast mouse motion, the coord updates jump to a few tens of
> pixels.  (1000Hz mouse)
> 
> Those numbers does not change from 60Hz to 144Hz, then I can rule out the input
> code.
> 
> If it's not my eyes or the screen itself, the pb will be in the cursor update
> code path from the xserver down to the driver...

Unless your xserver build ends up with INPUTTHREAD undefined for some
reason, input events are processed in a separate thread, and the HW
cursor position is updated accordingly ASAP.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer