Re: [PATCH] Add sysfs support for fbdefio delay

[Jaya Kumar <jayakumar.lkml@gmail.com>]

On Fri, Feb 26, 2010 at 6:53 PM, Bruno Prémont
<bonbons@linux-vserver.org> wrote:
> For me the driver would start with a default delay that matches the
> full-redraw throughput of the device but userspace could reduce the
> delay when it knows it will mostly just refresh small parts of the
> display (one or two tiles) and would like those done at a higher rate.

Who in userspace will know to reduce the delay? How will it know that
the delay should be reduced?

>
> A sample application would be displaying a media player interface
> like the one of XMMS and clones where Umeter (the part displaying
> volume per frequency range) could be refreshed ten times a second,
> the current position once a second and all the rest only on song
> change.

xmms/umeter will talk to this sysfs entry?

>
> Knowing the size of the display, probability that it's being used
> directly by X server is very small, it would rather be some application
> using it as a sideport display.
>

Yes, I'd like to know which applications these are.

Thanks,
jaya