Bug 105851 Xserver 1.20 RC2+ issues with Kwin + Present 1.2

[Mike Lothian]

Nope still not working

Intel DDX didn't launch, Modesetting did however compositing was disabled
due to the previous failure. Upon reenabling the screen went blank, however
things were still running, when I went to the top left corner I could see
the window titles, then the outline of the kicker menu too

On Thu, 5 Apr 2018 at 11:07 Mike Lothian <mike at fireburn.co.uk> wrote:

> There's also some journalctl output in the bug report
>
> On 5 April 2018 at 11:06, Mike Lothian <mike at fireburn.co.uk> wrote:
> > Hi
> >
> > I'm attaching the core dumps (4GB uncompressed, 7MB XZ compressed)
> >
> > Might still be too big for the list
> >
> > Cheers
> >
> > Mike
> >
> > On 5 April 2018 at 09:33, Daniel Stone <daniel at fooishbar.org> wrote:
> >> Hi Mike,
> >>
> >> On 5 April 2018 at 09:03, Mike Lothian <mike at fireburn.co.uk> wrote:
> >>> I got different behavior with modesetting and the intel ddx
> >>
> >> I can try with the Intel DDX later on today.
> >>
> >>> Both didn't render anything, but I think one was crashing over and
> >>> over (I think systemd kept restarting it in quick succession)
> >>
> >> systemd should log core files to coredumpctl and maintain any output
> >> from services it's started itself in journalctl, so it would be great
> >> to see any output and segfaults if possible.
> >>
> >>> I only remember that because when I switched VTs it made it almost
> >>> impossible to type anything as it kept modesetting back to VT1 for a
> >>> moment
> >>>
> >>> That didn't happen with the latest patches (which all seem to be in
> >>> master now) but I did get the freeze that you saw
> >>
> >> Right, they are in master now. Which freeze do you mean? If you attach
> >> to the kwin process and see it blocked forever waiting on a reply in
> >> libICE/libSM, this seems to be related to KDE's session management
> >> getting itself tangled, and _not_ anything to do with the rendering
> >> path. For me, the hang inside libICE/libSM was caused by wiping out
> >> all the ksmserver processes still running, as well as my .ICE-unix
> >> directory.
> >>
> >> If you are seeing KWin and all the KDE session helper programs alive
> >> and _not_ blocked inside libICE/libSM, a black screen and a KDE mouse
> >> cursor, that's far more interesting and I'd also like to see the X
> >> server's log file as well as any output from KDE in journalctl.
> >>
> >>> Be aware that kwin detects when there have been rendering crashes or
> >>> incomplete starts and disables compositing. With compositing disabled
> >>> or set to Xrender everything starts fine
> >>
> >> I'm _extremely_ sure that I was using GL compositing, because I was
> >> seeing debug prints that I'd added to Mesa (and the X server DRI3
> >> requests called by Mesa) from a session running only KDE and nothing
> >> else. These debug prints were only ever called when you are an X11
> >> compositing manager.
> >>
> >> Cheers,
> >> Daniel
>
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