Arch Linux

EAD

Member

Registered: 2006-03-11

Posts: 255

Slow page screen scroll

Hii, I don't know if this topic belongs to this forum, any way
I am a bit odd thing in ARCH, it seem that when using the console and doing things like "cat" or "less" or what ever that scroll the screen. it moves really slow, like line by line, Does anyonw knows how to fix it up? :?:

Neuro

Member

From: Poland

Registered: 2005-10-12

Posts: 352

Re: Slow page screen scroll

Assuming that you're using vesafb (or vesafb-tng) framebuffer. From linux/Documentation/fb/vesafb.txt:

You can pass options to vesafb using "video=vesafb:option" on the kernel
command line. Multiple options should be separated by comma, like this:
"video=vesafb:ypan,1024x768-32@85"

Note that vesafb-tng still uses the "video=vesafb:option" format of the
kernel command line video parameter. "video=vesafb-tng:xxx" is incorrect.

Accepted options (both vesafb and vesafb-tng):

ypan    Enable display panning using the VESA protected mode interface
        The visible screen is just a window of the video memory,
        console scrolling is done by changing the start of the window.
        pro:    * scrolling (fullscreen) is fast, because there is
                  no need to copy around data.
                * you'll get scrollback (the Shift-PgUp thing),
                  the video memory can be used as scrollback buffer
        con:    * scrolling only parts of the screen causes some
                  ugly flicker effects (boot logo flickers for
                  example).

ywrap   Same as ypan, but assumes your gfx board can wrap-around the video
        memory (i.e. starts reading from top if it reaches the end of
        video memory). Faster than ypan.

redraw  Scroll by redrawing the affected part of the screen, this is the
        safe (and slow) default.

vgapal  Use the standard VGA registers for palette changes.
        This is the default.

Redraw is really really slow. Try using ypan or ywrap. Pass the following parameter during kernel load:

video=vesafb:ypan