Subject:
Re: [nanogui] Flicker with dynamic images
From:
Franco Chalissery ####@####.####
Date:
13 Apr 2009 04:26:42 -0000
Message-Id: <10eaa5690904122126w613273d2v5c7e63dcddac92b3@mail.gmail.com>
Hi,
I have the same issue which i have posted in the group, anyways for
me the mouse pointer moves here and there irrespective of the touch
made by the stylus. I think there is something to be done with the
sensitivity or pressure reading . I think we are on the same boat ;-).
As a you have addressed as launcher works it is same for me also.
screen saver will also comes up but no input will be taken.
-Thanks
Franco
On 4/13/09, Robert S. Grimes ####@####.#### wrote:
> Hi,
>
> I'm working with a board derived from the Freescale/LogicPD mcf5329
> evaluation board, and using the microwindows-0.90 package which is
> included in ltib-cf_nommu-20081215 from Freescale's web site. The
> framebuffer (kernel is linux-2.6.26) is set up for a 320 wide by 240
> high LCD. The penguin shows fine on power-up.
>
> But, when I try to run some of the demo apps, I get mixed results at
> best. As a good example of exactly where I'm at, if I
> run /usr/nanox/launcher.sh, I get what appears to be a 3 x 3 matrix of
> icons, presumably for launching other demo apps; the icons included are
> (top row) Tetrix, Slider, Terminal; (middle row) Clock, Magnifier,
> Scribble, (bottom row) Roach, Tux, and NXEyes. This matrix has its
> lower left corner aligned with the lower left corner of the screen, and
> does not occupy the entire screen; the remainder (about the top 25% and
> the rightmost 10%) seems to be some patterned background. All this
> appears good - I say "appears" as I'm not really sure what to expect.
> However, there is a big problem - the bottom ~20% of the screen has a
> flicker that exhibits itself as random row-wide artifacts. What I mean
> is that it seems some rows really are not being drawn - for example, row
> 200 might be drawn, row 201 gets skipped, and row 202 gets drawn where
> 201 should be. I say this because it appears that the labels of the
> bottom three icons (i.e. Roach, Tux, and NXEyes jump up and down a row
> or two. The rest of the display is rock-solid.
>
> After playing with this a while, I've discovered something. After about
> 15 seconds, the launcher.sh demo goes into a random screensaver mode.
> Some screensavers look really good, such as a "searchlight" that
> illuminates a small circle that is moved over the display, the rest of
> which is black - simulating a flashlight searching in a darkened room.
> For this screensaver, every thing is sharp, and there is no flicker
> whatsoever. Other screensavers, such as one that looks like lighting
> flashes, exhibits the flicker over large portions of the display - not
> just the bottom portion.
>
> Other screensavers show either extreme, or behavior in between them.
> What seems to be going on is that the more dynamic the graphics, the
> more the flicker is exhibited. Put another way, the more static the
> display, the less flicker is noticed. I would expect that a totally
> static display might well show no flicker whatsoever. (Note: I don't
> know if the launcher.sh main screen is indeed fully static - it would
> appear to be, but perhaps something at the very bottom isn't).
>
> This would seem to be timing related or something, but I haven't been
> able to find anything amiss in the stock code. I did come across
> something regarding priority of the LCD controller on the internal
> crossbar switch, but it appears that it has already been elevated to the
> highest priority by the kernel.
>
> I'm completely stumped by this - anyone have any ideas on what might be
> amiss, or what to investigate?
>
> Thanks,
> -Bob
>
>
>
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