[Wayland-bugs] [Bug 82748] permanently black screen on ThinkPad X200

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82748

--- Comment #15 from Pekka Paalanen <ppaalanen at gmail.com> ---
(In reply to comment #14)
> (In reply to comment #13)
> > (In reply to comment #12)
> > > (In reply to comment #11)
> I was using the Debian weston package, which indeed does that, see
> http://sources.debian.net/src/weston/1.5.0-2/debian/rules/:
> 
> """
> override_dh_auto_configure:
> 	dh_auto_configure -- --disable-libunwind --libexec=/usr/lib/weston \
> 		--with-cairo=gl --enable-libinput-backend
> """
> 
> Would it be advisable to not do that at all for some reason?

The only benefit from --with-cairo=gl is that you get weston-gears and
weston-screensaver which is a matrix-style animation. The downsides are that
almost every demo program and desktop helper program in Weston will be trying
to use GL for rendering that does not really benefit from it. Initializing all
those GL contexts eats resources. For the same reason I would avoid
--with-cairo=glesv2, which makes you lose the "nested" demos.

> > If that was the culprit, then weston-simple-shm should have showed up on
> > screen in any case. Did you ever try that app?
> I re-installed libgl1-mesa-swx11, started weston-launch on the VT and got a
> black screen. Then I ran weston-simple-shm, and I can see a quadratic window
> which contains some animated colored circles, so I think that’s a successful
> test.

Yes. So nothing wrong with Weston apparently.

> > If that app does indeed show up when everything else is just black, then
> > there is no problem in Weston, and nothing to fix in Weston itself, because
> > it is running just fine.
> Hm, but doesn’t Weston draw the panel at the top part of the screen where
> one can start e.g. a terminal emulator? If that does not show up, isn’t that
> a bug in Weston?

No. Both wallpaper and the panel are drawn by a helper app,
weston-desktop-shell.

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