On 17 Jun 2016 6:23 p.m., "Chris Wilson" <chris@xxxxxxxxxxxxxxxxxx> wrote:
>
> On Fri, Jun 17, 2016 at 06:12:16PM +0800, Daniel J Blueman wrote:
> > On 17 June 2016 at 17:18, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> 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?
>
> I would look at -nightly first and hope that is has been fixed (and that
> the fix is trivial).
No cigar with -nightly, so I'll follow up in a few days after I get through the 4.2-4.3 kernel bisection.
Daniel
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