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Topic: /dev/fb0 access denied when using fbi

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roberts

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Posts: 4983
Joined: Oct. 2003

Posted: Jan. 24 2007,14:36

SOP
# rm /dev/fb0
# cp /KNOPPIX/dev/fb0 /dev/fb0

Zucca

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Posts: 524
Joined: Feb. 2006

Posted: Jan. 25 2007,09:50

Oh no.
Something went badly wrong:

Code Sample

sudo cp /KNOPPIX/dev/fb0 /dev/fb0
cp: writing `/dev/fb0': No space left on device

Removing was succesful, but as you can see copying wasn't.
Now I have no /dev/fb0 at all!

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Do you have it? - http://dy.fi/mak

Zucca

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Joined: Feb. 2006

Posted: Jan. 25 2007,10:09

Ok. I got it back like it was.
It seems that when I copied fb0 from /KNOPPIX it filled all available space and then reported about the unsufficient space.
AFAIK all files in /KNOPPIX/dev aren't just regular files. They have no size and so on. So it would be actually impossible to copy those files.
I belive I must somehow re-mount /KNOPPIX as read-write then chmod /KNOPPIX/dev/fb0 and then again re-mount /KNOPPIX to read-only.

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Do you have it? - http://dy.fi/mak

mikshaw

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Joined: July 2004

Posted: Jan. 25 2007,14:05

You can't remount KNOPPIX read-write because it is an iso9660 filesystem. The filesystem itself is read-only by design.

I can't think of any solution at the moment...i'll think about it.

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roberts

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Posts: 4983
Joined: Oct. 2003

Posted: Jan. 25 2007,16:38

Instead of cp on character special file do this after the removal of the link /dev/fb0

sudo mknod /dev/fb0 c 29 0

This will re-create the "c" special file.
Then be sure to chmod and chgrp per your requirements.

One other thing you might want to consider instead of removing and recreating /dev/fb0...

The group for /dev/fb0 is tty, add this group to user dsl and try your program

sudo usermod -G tty dsl

15 replies since Jan. 23 2007,15:26

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Damn Small Linux Board » Damn Small Linux » Other Help Topics » /dev/fb0 access denied when using fbi