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Bug#697727: xserver-xorg-video-radeon: [radeon] Scrolling in xterm slow with KMS



On Thu, 10 Jan 2013 10:34:07 +0100, Michel Dänzer <daenzer@debian.org> wrote:

On Don, 2013-01-10 at 10:14 +0100, Tilo Schwarz wrote:
On Thu, 10 Jan 2013 09:16:37 +0100, Michel Dänzer <daenzer@debian.org>
wrote:

> On Mit, 2013-01-09 at 20:01 +0100, Tilo Schwarz wrote:
>>
>> Indeed, using
>>
>> % grep ColorTiling /etc/X11/xorg.conf
>>          Option          "ColorTiling"   "off"
>>
>> the scrolling is twice as fast as without this option (from 12sec down
>> to
>> 6sec). That is still almost three times slower than without KMS, but
>> already much more usable!
>
> The better solution would be to configure your terminals to use
> fontconfig/Xft for text rendering.

Do you have a link to "the correct debian way" to enable fontconfig/Xft
for text rendering? (Me being no X11 expert ...)

It's app/toolkit specific. E.g. with xterm you can enable it with -fa
and related options.


Is it a fontcontig and Xft, or is it a either fontcontig or Xft?

It's mainly about Xft. Most users of that also use fontconfig for
selecting the fonts to use, but that's not required.

Most apps/toolkits have used the modern text rendering infrastructure by
default for a long time, but a lot of terminal emulators are still
holding out for some reason.

One last addition. I worte "... rxvt-unicode, which has xft support."

But accoding to the rxvt-unicode man-page, my xresource "urxvt*font: 9x15" does not select a xft font, because urxvt uses x fonts by default. So urxvt is able to scoll fast although no xft font is used. Running "ltrace urxvt" shows, that xft funcions are only called, if I specify the font with "xft:9x15".

Regards,
	Tilo


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