<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - screen corruption using SNA and TearFree on Intel GeminiLake" href="https://bugs.freedesktop.org/show_bug.cgi?id=105720#c20">Comment # 20</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - screen corruption using SNA and TearFree on Intel GeminiLake" href="https://bugs.freedesktop.org/show_bug.cgi?id=105720">bug 105720</a> from <a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>Based on Martin's AccelMethod=none logs, we found this: commit 7418d53c589719f71154c5ec58a2b7c486020587 (HEAD, upstream/master) Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Date: Wed Mar 28 19:38:51 2018 +0100 sna/dri2: Clip application of damage to windowed swapbuffers Since forever we have been passing region=NULL when doing a windowed swapbuffer on vblank, and using that to mark the entire pixmap as being damaged. For an uncomposited window, this is incorrect as it points to a clipped region of the ScreenPixmap and so we were marking the entire ScreenPixmap as being flushed, but only having operated on the windowed region. Instead pass along the clip extents if region is unset. References: <a class="bz_bug_link bz_status_NEW " title="NEW - screen corruption using SNA and TearFree on Intel GeminiLake" href="show_bug.cgi?id=105720">https://bugs.freedesktop.org/show_bug.cgi?id=105720</a> Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> It definitely impacts AccelMethod=none and seems to improve AccelMethod=sna as well, but I haven't been able to explain why.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>