Comment 115 for bug 311895

Sigh, looking again at your older logs I doubt that last patch will fix the issue:

(II) intel(0): FIFO size - A: 28, B: 59
(II) intel(0): Setting FIFO watermarks - A: 1, B: 1, C: 2, SR 22

So we're already setting the watermark as aggressively as possible, so the pipe should be continuously fetching data for display. In your config that's still not enough though, since we drain it faster than we fill it.

Another thing that might help is to reduce the pixel clock on the mode you're sending to your external monitor; you can use the cvt or gtf tools to create a mode with reduced blanking or a lower refresh.

I think I'll need to cook one up to modify DSPARB as well (like we do in the current driver).