Mesa 27 polls timeline points with CMDSTREAM_READTIMESTAMP_CTXTID and
reports any failure as VK_ERROR_UNKNOWN, so gamescope aborted at start on
Quest with vk.WaitSemaphores result -13. Track each context's submitted
timestamps in the preload and answer a failed read from one millisecond
WAITTIMESTAMP calls. Log refused KGSL ioctls to session.log.
fix(quest): stabilize desktop and Steam layer presentation
Keep Quest SDR scenes and the black backdrop off the Android Vulkan swapchain regardless of session order or HDR preferences. Only report the first frame after client content is submitted.
Add backdrop lifecycle and first-frame regression coverage. Record the user's successful Quest 3 Test 2 result.
Co-authored-by: xXJsonDeruloXx <danielhimebauch@gmail.com>
Kurt Himebauch