[Intel-gfx] Mouse cursor disappearing with SNA rendering

[Daniel J Blueman]

On 17 June 2016 at 17:18, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> On Fri, Jun 17, 2016 at 05:08:55PM +0800, Daniel J Blueman wrote:
>> Hi all!
>>
>> When unlocking from lightdm, the mouse cursor isn't visible until
>> switching VTs. This doesn't occur when using UXA rendering mode
>> though, and affects a *lot* of people [1]. It occurs with a range of
>> kernels including 4.6.2.
>>
>> I'm using xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1
>> (current in Ubuntu 16.04 LTS).
>>
>> How can I approach debugging it?
>
> Start with a kernel from about 3.19. The trigger was introduced by
> xorg-server-1.18.3 which double applied a SETCURSOR ioctl. That should
> have been a noop...

Thanks for replying Chris!

I find the issue occurs in kernels 4.6.2, 4.4.13 and 4.3.6, but does
not in 4.2.8 or 4.1.26, however I also see that locking the screen
doesn't blank it, so there is behavioural difference also.

This may result in a kernel bisect tripping on a large merge; I can
take a look if you think the odds are ok?

Dan
-- 
Daniel J Blueman