Difference between revisions of "Scrollback buffer"

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(The Easy Way: does this really work?)
 
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[[Category:Terminal emulators]]
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#REDIRECT: [[General troubleshooting#Scrollback]]
Scrollback is a function that is implemented in a text console to allow the user to go back to view the lines of text which have scrolled off the screen.  This is made possible by a buffer created just for this purpose between the video adapter and the display device; the scrollback buffer.  Normally, the key combinations of Shift-PageUp or Shift-PageDown allows the user to scroll up or down a page or two by default.
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However, what if one wishes to keep track of more than that small amount?  During boot this is particularly necessary, as the text scrolls off by quite a few pages.  To solve this need, the scrollback buffer must be increased.  It is a simple process to do so.
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The basic buffer size is 32K, equal to approximately 4 half pages of text.  The easy way to increase this is to use a device called fbcon (the framebuffer console).  To find out about fbcon, this [http://www.mjmwired.net/kernel/Documentation/fb/fbcon.txt link] can give you more information.  Just follow these instructions.
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== The Easy Way ==
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Edit the appropriate kernel line as used by your bootloader (e.g. {{ic|/boot/grub/menu.lst}} for [[GRUB]], or {{ic|/boot/syslinux/syslinux.cfg}} for [[syslinux]]).  Make the following changes:
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* If {{ic|vga=XXX}} exists, delete it.
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* Append {{ic|XXXfb}}, replacing XXX with the name of your video driver.
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* Append {{ic|fbcon=scrollback:Nk}}, where N is the amount of scrollback desired.
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Then reboot.
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Latest revision as of 10:12, 16 November 2016