<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Delay in skl_disable_plane() causes a system freeze" href="https://bugs.freedesktop.org/show_bug.cgi?id=104975#c51">Comment # 51</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Delay in skl_disable_plane() causes a system freeze" href="https://bugs.freedesktop.org/show_bug.cgi?id=104975">bug 104975</a> from <a class="email" href="mailto:marc.herbert@intel.com" title="marc.herbert@intel.com">marc.herbert@intel.com</a> <pre>Created <a href="attachment.cgi?id=138830" name="attach_138830" title="vertical corruption unless wait for vblank after disabling cursor">attachment 138830</a> <a href="attachment.cgi?id=138830&action=edit" title="vertical corruption unless wait for vblank after disabling cursor">[details]</a> vertical corruption unless wait for vblank after disabling cursor Could this be related? See screenshot attached and workaround by: Kristian H. Kristensen <a href="https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/877396">https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/877396</a> CHROMIUM: drm/i915: Wait for vblank after disabling cursor The cursor disable write is latched on vsync but if we do a modeset before that happens the write seems to be discarded and the cursor stays on. The CURCNTL register will still read back 0 as if the write took, but underlying hardware didn't change. We don't disable the cursor often, so we can just force the pre-GEN9 path for cursor that waits for vblank. * Unfortunately, the GEN9+ double buffering seems to be buggy when it * races with a modeset.... I'm guessing that this issue may well be present in upstream kernels and regular Linux distros, the difference being that no other distro so far has shipped with Y-tiled framebuffers. (I doubt many distros have shipped with hardware overlays either -- Marc)</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>