<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED --- - [snb] vsync hang" href="https://bugs.freedesktop.org/show_bug.cgi?id=68718#c23">Comment # 23</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED --- - [snb] vsync hang" href="https://bugs.freedesktop.org/show_bug.cgi?id=68718">bug 68718</a> from <a class="email" href="mailto:imirkin@alum.mit.edu" title="Ilia Mirkin <imirkin@alum.mit.edu>"> Ilia Mirkin</a> <pre>(In reply to <a href="show_bug.cgi?id=68718#c20">comment #20</a>) > Guessing now, but maybe try this delta patch on top: > > diff --git a/src/sna/sna_display.c b/src/sna/sna_display.c > index 99afbd1..2620669 100644 > --- a/src/sna/sna_display.c > +++ b/src/sna/sna_display.c > @@ -3984,7 +3984,7 @@ static bool sna_emit_wait_for_scanline_gen6(struct sna > *sna, > b = kgem_get_batch(&sna->kgem); > > /* Both the LRI and WAIT_FOR_EVENT must be in the same cacheline */ > - if (((sna->kgem.nbatch + 6) >> 4) != (sna->kgem.nbatch + 9) >> 4) { > + if (((sna->kgem.nbatch + 6) >> 3) != (sna->kgem.nbatch + 10) >> 3) { I also tried leaving this at >> 4 (but with the +10) > int dw = sna->kgem.nbatch + 6; > dw = ALIGN(dw, 16) - dw; And I tried making this ALIGN(..., 8) with the >> 3 shift > while (dw--) > > > I think the cacheline it mentions is 64bytes, but we may as check against > 32bytes just in case. In all the cases, I was able to reproduce [112535.225840] [drm:ring_stuck] *ERROR* Kicking stuck wait on render ring Every so often I also got [117822.524434] [drm] no progress on render ring [117822.524482] [drm:i915_set_reset_status] *ERROR* render ring hung flushing bo (0x60e000 ctx 0) at 0x1de05ce4 But my understanding is that this is unrelated to the issue at hand.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>