Half frame rate (37.5) on Linux using SDK 0.4.3

After some more investigation, I've determined that not setting ovrDistortionCap_Overdrive seems to fix the problem, but I still don't know why.

EDIT: Here is a minimal demo that demonstrates the problem: https://www.jspenguin.org/software/glbumper/files/simplevr-0.1.tar.gz

All it does each frame is call ovrHmd_BeginFrame, ovrHmd_GetEyePoses, and ovrHmd_EndFrame.

I also have this problem with OculusWorldDemo, haven't found out what's causing it yet.

Arch Linux, kernel 3.17.1, nvidia 343.22 (Quadro 1000m)

Just FYI I know several people on Windows using SDK 0.4.3 & running Elite Dangerous in Direct mode who are stuck on half frame rate (37.5 fps exactly). One of those is me, in extended mode I hit a rock solid 75 fps.

I'm seeing unusual frame rate drops too, though it doesn't seem to be as methodic as yours. I don't have time to investigate it today, but just got the DK2 integrated into our engine and this is causing trouble.

I'm on Linux using seperate X screens.

"MarkDon" wrote:
Just FYI I know several people on Windows using SDK 0.4.3 & running Elite Dangerous in Direct mode who are stuck on half frame rate (37.5 fps exactly). One of those is me, in extended mode I hit a rock solid 75 fps.

I have this exact problem in Direct to Rift mode, unfortantly my DK2 is not detected in extended mode.

I have the same issue.

Running Windows 8.1, GTX770/i5 4790k

wtf?

EDIT: This in E:D, too

I've found that this isn't so much a lack of framerate, but a lag in head tracking. I get a constant lag in every demo on Linux (including the Desk and Tuscany demos), while under Windows there is no such lag. One thing I noticed in Tuscany, however, was that if I kept my head still and moved, the lag was not evident. So something tells me it's a problem with oculusd itself in relation to recieving these values in the applications. Perhaps someone could make a test application (a terminal app or something) to see if there's just a large amount of latency updating those values?

I've got the same problem on Linux with SDK 0.4.4
fps is stays around 30 even if I run demo without oculus turned on.

The first time I ran your simplevr demo under Linux, the console output reported around 30fps from the very beginning. The second time, and all subsequent times, it reported ~60fps (not 75) long past 36 seconds (I ran it for up to 2 minutes). I do get judder, as I do with OculusWorldDemo from both 0.4.3 and 0.4.4 (I do not get judder with games compiled with 0.3.x). I had oculusd from 0.4.4 running.