susanabanana Posted October 9, 2018 Share Posted October 9, 2018 My Vive Pro had been displaying the Compositor not available (400) error for two days. I reseated the cables, power cycled link box, restarted SteamVR many times, updated my GPU driver, restarted my PC and reinstalled Steam/SteamVR but it persisted. When I saw the 400 error before, reseating the cables and restarting the PC got rid of the error but this time I did everything I could think of and find from the internet and nothing helped. So I gave up and went to sleep. Then the next day I just tried restarting SteamVR and it just started working again. I checked the vrcompositor log and noticed that it kept saying "NvAPI: Failed to get direct display modes! Error='NVAPI_OK' NumModes=0 ... Failed to create direct mode display!" then all of a sudden it says "Creating nvapi display". So I am wondering if the updated graphics card driver information wasn't getting through to SteamVR because of some GPU information cache and if so, where is this information stored so that I can jumpstart the process if this happens again? My GPU is GeForce 1070 btw. Thank you in advance! Link to comment Share on other sites More sharing options...
YourToxicity Posted December 11, 2018 Share Posted December 11, 2018 I have a 1070ti and i've been having the same issue. Nothing has been working to troubleshoot the problem. I have no idea what to try. If you have an update i'd greatly appreciate it! :) Link to comment Share on other sites More sharing options...
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