how to activate /dev/fb?

NoOp glgxg at
Mon Sep 7 17:23:32 UTC 2009

On 09/06/2009 11:42 PM, loody wrote:
> Hi:
> 2009/9/3 NoOp <glgxg at>:
>> On 09/01/2009 11:17 PM, loody wrote:
>>> Dear all:
>>> I get a application which need /dev/fb.
>> What application?
> QEMU and skyeye.

When you install either:

$ sudo apt-get install skyeye (or qemu)

Do they install properly?

>>> I search the web and find it is the device node of frame buffer driver.
>>> my question is
>>> 1. how could I know the frame buffer driver is ready on my Ubuntu?
>>> 2. I find there is no /dev/fb/0 or dev/fb/1 under my ubuntu.
>>>     does that mean what I have to do is adding the node for
>>> application to access?

If you look in /etc/modprobe.d, you'll find a file
'blacklist-framebuffer.conf'. The start of the file ('cat
blacklist-framebuffer.conf' reads:
# Framebuffer drivers are generally buggy and poorly-supported, and cause
# suspend failures, kernel panics and general mayhem.  For this reason we
# never load them automatically.

So, it appears that you'll need to either manually load, or comment out
the appropriate line in the blacklist file.

This might help (bit dated, but probably worth viewing):
[Gutsy Framebuffer HOWTO]


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