Ubuntu
linux package

  1. Bug #1140716
  2. Comment #299

Comment 299 for bug 1140716

Revision history for this message
In , Chris Wilson (ickle) wrote :

(In reply to comment #27)
> (In reply to comment #24)
> > Mikhail, for the time being you can set i915.semaphores=0 (or echo 0 >
> > /sys/modules/i915/parameters/semaphores) to prevent this hang.
>
> What are the consequences?

Rendering throughput is dropped by 10% with SNA, or as much as 3x with UXA. OpenGL performance is likely to be reduced by about 30%. More CPU time is spent waiting for the GPU with rc6 disabled, so increased power consumption.