Re: [iPAQ] Sub-optimal display quality with recent Linux kernels

Note that there's a known hardware issue with early ipaq LCD connectors,
the most obvious symptom of which is the screen 'flipping' mirror image.
Perhaps Carl has detected early onset dementia^W screen flipping?

Ross

On Tue, Oct 09, 2001 at 04:56:00PM -0400, Christian, Andrew wrote:
> I've checked all the core system registers used to set the color LCD on
> the H3600, and they are almost exactly the same from WinCE to Linux: the
> two differences are (a) WinCE generates interrupts when the LCD is
> disabled/the base address is updated/errors occur, and (b) WinCE claims
> the screen is 241 pixels wide, instead of 240.
>
> I tried running the screen in Linux at 241 pixels wide, but didn't see
> any visible change in the quality of the displayed image.
>
> The trough of my rxvt scrollbar is clean and sharp under Linux. What
> model iPAQ are you using?
>
> - Andrew
>
>
> -----Original Message-----
> From: Keith Packard [mailto:keithp@keithp.com]
> Sent: Monday, October 08, 2001 8:50 PM
> To: Carl Worth
> Cc: ipaq@handhelds.org
> Subject: Re: [iPAQ] Sub-optimal display quality with recent Linux
> kernels
>
>
>
> Around 15 o'clock on Oct 8, Carl Worth wrote:
>
> > But, in addition, under Linux, some of the colors seems to "swim" a
> > bit although similar colors under WindowsCE are quite sharp. A good
> > example of a swimming color can be seen in the trough of the scrollbar
> > of rxvt. It seems to have long thin shimmering lines running up and
> > down it.
>
> I know that in monochrome mode, the LCD controller modulates the pixels
> to
> approximate gray values and some "swim" more than others. I've also
> seen
> this effect on TFT laptop screens when the hardware is set to try to
> reproduce too many colors. Perhaps additional tweaks to the LCD
> controller are needed?
>
> keithp@keithp.com XFree86 Core Team SuSE, Inc.
>
>
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-- 
--
Ross Reedstrom, Ph.D.                                 reedstrm@rice.edu
Executive Director                                  phone: 713-348-6166
Gulf Coast Consortium for Bioinformatics              fax: 713-348-6182
Rice University MS-39
Houston, TX 77005