<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - External monitor ("reverse PRIME", Output Sink) updates very slowly (1fps) when laptop screen is off" href="https://bugs.freedesktop.org/show_bug.cgi?id=99128#c1">Comment # 1</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - External monitor ("reverse PRIME", Output Sink) updates very slowly (1fps) when laptop screen is off" href="https://bugs.freedesktop.org/show_bug.cgi?id=99128">bug 99128</a> from <a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>(In reply to Peter Wu from <a href="show_bug.cgi?id=99128#c0">comment #0</a>) > Other information: > A similar problem existed in the modesetting driver, fixed in Xorg 1.19 with > <a href="https://lists.x.org/archives/xorg-devel/2016-August/050797.html">https://lists.x.org/archives/xorg-devel/2016-August/050797.html</a> > I think that a similar fix can be developed for sna_display.c > (sna_covering_crtc). That is what sna_covering_crtc has been doing that for the last few years. The problem is that you don't have any Intel CRTCs from which we can use as a vblank source and so you suffer from the woeful present fallback, as we don't seem to be able to offload the vblanks onto the slave outputs.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>