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

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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Received on Tue Oct 9 12:56:31 2001