question about drm backend

zou lan nancy.lan.zou at
Fri Nov 23 08:22:56 UTC 2018

Hi pekka

>>do you mean users as humans or as apps?
yes. I mean the apps. I think it's no big impact for apps. The major
changes for weston new version is focus on libweston/drm backend.

I still want to ask something about drm backend. About on_drm_input()
function in compositor-drm.c, do this function plan to listen all CRTCs'
pageflip/vblank event or only listen
one primary CRTC's pageflip/vblank event? I think the repaint_flush() want
to do AtomicCommit for all crtcs one time, does it support commit for each
output just like the old
drm backend design in weston 5.0 or latest weston architecture?

Thank you!
Best Regards

Pekka Paalanen <ppaalanen at> 于2018年11月20日周二 下午10:43写道:

> On Tue, 20 Nov 2018 20:32:53 +0800
> zou lan <nancy.lan.zou at> wrote:
> > Hi pekka
> >
> > Thank you so much to explain the drm backend details. I ask these because
> > some company may implement their own drm backend, changes on interfaces
> > between libweston
> > and drm backend may increase the merge effort.
> >
> > Could I also ask is weston backward compatible from weston 2.0 to weston
> > 5.0 from users. According to my study, I think there is no big impacts
> for
> > users, is it right?
> Hi Nancy,
> do you mean users as humans or as apps? There may have been some
> changes in the command line options and weston.ini, but I think they
> have generally been fairly stable. The biggest impact on app support
> was probably the xdg-shell v5 era and the eventual removal of it.
> I can't really remember even 5.0 release, but I would hope the notable
> changes would have been mentioned in the release announcements.
> Oh, removal of the Raspberry Pi backend, and removal of EGL support
> from the fbdev-backend come to mind. I'm not actually sure if those
> were before or after 2.0, it was so long ago.
> > Will AGL adopt the weston 5.0 or other weston version in their new AGL
> > version sunch as AGL 7.0?
> I haven't followed AGL, so I don't know, nor do I participate there
> currently.
> Thanks,
> pq
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