# Re: \[PATCH\] Add sysfs support for fbdefio delay

- From: Jaya Kumar \<hidden\>
- Date: 2010-02-26 11:09:32 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2010/02/1363764
- Thread: https://ratatoskr.run/linux-fbdev/2010/02/1363554/t.md

```text
On Fri, Feb 26, 2010 at 6:53 PM, Bruno Prémont
[ref] 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
```