OK, I think this might be the problem. The client API is releasing its shared pointer the the software buffer region prematurely (before mir_buffer_stream_get_graphics_region even returns). This means we are calling Android's gralloc->unlock() way before the client has even started filling the buffer!
void mir_buffer_stream_get_graphics_region( MirBufferStream *buffer_stream, MirGraphicsRegion *region_out) try { mcl::ClientBufferStream *bs = reinterpret_cast<mcl::ClientBufferStream*>(buffer_stream); auto secured_region = bs->secure_for_cpu_write(); region_out->width = secured_region->width.as_uint32_t(); region_out->height = secured_region->height.as_uint32_t(); region_out->stride = secured_region->stride.as_uint32_t(); region_out->pixel_format = secured_region->format; region_out->vaddr = secured_region->vaddr.get(); } catch (std::exception const& ex) { MIR_LOG_UNCAUGHT_EXCEPTION(ex); } ** Changed in: mir Assignee: (unassigned) => Daniel van Vugt (vanvugt) ** Changed in: mir Milestone: None => 0.17.0 ** Changed in: mir Status: Triaged => In Progress -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1406725 Title: Severe graphical corruption running software clients (including Xmir) on android To manage notifications about this bug go to: https://bugs.launchpad.net/mir/+bug/1406725/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp