Subject:
Re: [nanogui] Flicker with dynamic images
From:
Vladimir Ananiev ####@####.####
Date:
13 Apr 2009 05:26:33 -0000
Message-Id: <ce55079f0904122226i61ab29fbh6b6c8a3ed09735aa@mail.gmail.com>
Just try to use CVS version of Nano-X, personally I have never seen such issues.
On Mon, Apr 13, 2009 at 8:26 AM, Franco Chalissery
####@####.#### wrote:
> 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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