Re: Attempted summary of "RT patch acceptance" thread

[Lee Revell]

On Fri, 2005-06-10 at 19:37 +0200, Andrea Arcangeli wrote:
> You don't need to add it to the document, but as a further pratical
> example of troublesome hardware besides VGA (could be a software issue
> and not hardware issue though)  

The VGA problems were due to (X, not kernel!) driver bugs.  Recent
versions of X are thought to be OK.

It's the exact same issue described in this paper, scroll down to
section 4.5.

http://www.cs.utah.edu/~regehr/papers/hotos7/hotos7.html

There's absolutely nothing the kernel or PREEMPT_RT can do about this,
AFAICT even RTAI would be affected, because X lets userspace drivers
talk directly to the hardware including wedging the PCI bus.

Lee

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