Distance field AO: AMD Driver crash when changing Skylight to Movable
I experience a driver crash when I enable distance field AO, load "StarterMap" (of a freshly created "Third Person Code" Project without any code changes), place a skylight and change its mobility type to Movable (once I click on Movable it crashes). The driver crash doesn't happen when distance field AO is disabled. I get the typical "Display driver has stopped responding and has recovered" popup and a message box showing "Video driver crashed and was reset! Make sure your video drivers...".
I am using the latest 4.3 source code (Jul 14, 2014) and the required+optional "4.3.0-preview" packages provided on the release page on github.
My GPU is a Saphire R9 290 Tri-X OC. I tried the latest AMD drivers (14.4 and 14.7 RC) but it didn't solve the problem. My OS is Windows 8.1 Pro x64.
Log file: http://bit.ly/1oBx8r6
DxDiag file: http://bit.ly/1mUURFm
I tried to find an actor which might cause the problem. After trying many combinations I found that actor "P_Sparks_Blueprint" might have something to do with it. If I open "StarterMap" and delete "P_Sparks_Blueprint" the driver crash still occurs. However, if I open "StarterMap", delete "P_Sparks_Blueprint", save the map to a new file, restart the editor (it doesn't seem to be enough to just reload the map), and open the saved map the problem seems to be gone. I am not really sure if the particle effect is the exact source of the problem, it might be a coincidence.
A fix for one GPU hang caused by DFAO is now in 4.5, hopefully it is the only GPU hang.
answered Oct 04 '14 at 12:29 AM
Thank you again for your bug report. We had a fellow developer also crash when testing out Ambient Occlusion. I have entered the bug into our system database so that it may be fixed in a future release.
Thanks again and have a great day!
answered Jul 22 '14 at 05:41 PM
[Epic] Gribbs ♦♦ STAFF
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