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32bit framebuffer

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agaf
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n00b

Joined: 30 May 2006
Posts: 1

Posted: Tue May 30, 2006 11:44 am Post subject: 32bit framebuffer

I need 32bit framebuffer. Booting from Gentoo Minimal LiveCD I type "gentoo video=vesafb:800x600-32 @75" but it doesn't work (fb resolution is default - 1024x768). What should I do to change fb parameters?

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forgotten1
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Joined: 11 Jan 2005
Posts: 477
Location: East Coast, USA

Posted: Tue May 30, 2006 2:59 pm Post subject:

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If you research the framebuffer device being used by the minimal LiveCD:

Code:

less /proc/config.gz

You will learn that vesafb is being used, not vesafb-tng. This means the 'video=' statement won't work. With the vesafb driver, you have to use the 'vga' statement to change the resolution. A quick search (google 'framebuffer howto') identifies the fact that 32 bit modes are [identified] at the discretion of the manufacturer, and you will have to discover what those codes are. You might add:

Code:

vga=ask

to the boot parameters, but the specific 32 bit mode may not be listed. According to the framebuffer howto, the 24bit mode for 800x600 resolution is selected with:

Code:

vga=0x315

You might try that, to see if it 'just works.' Additionally, if all else fails, you can set the gentoo-nofb boot parameter to get started without a framebuffer.

It would also be helpful if you posted the results of

Code:

lspci

so that I and others can see what type vga compatible controller you are using.

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