# Re: \[Linux-fbdev-devel\] \[uclinux-dist-devel\] \[PATCH\] \[\#7001\] framebuffer: old image of last app woul

- From: Mike Frysinger \<hidden\>
- Date: 2012-03-15 19:29:20 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2012/03/13462781
- Thread: https://ratatoskr.run/linux-fbdev/2012/03/13462779/t.md

```text
On Thursday 15 March 2012 15:22:34 Geert Uytterhoeven wrote:
> On Thu, Mar 15, 2012 at 20:08, Mike Frysinger wrote:
> > On Thursday 15 March 2012 05:23:50 Wu, Aaron wrote:
> >> Old image of last application would retain for a while when starting a
> >> new application, this patch clear the frambuffer before displaying
> >> every time the fb is opened.
> > 
> > i'm not sure the behavior you describe is wrong.  in fact, i'm pretty
> > sure it sounds correct.  if an app writes an image to the framebuffer
> > and then quits, that image should stay there indefinitely until
> > something else opens the framebuffer and draws their own image.
> 
> Indeed. Else can you no longer make a screenshot using "cat /dev/fb0 >
> file".

ironically, that's one method we've documented for Blackfin platforms :)
http://docs.blackfin.uclinux.org/doku.php?id=uclinux-dist:framebuffer
-mike
```

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