[gentoo-user] scrollback using framebuffer

[gentoo-user] scrollback using framebuffer

[Maxim Wexler]

Hi group,

I'm using the nvidia framebuffer(CONFIG_FB_NVIDIA=y) but I can't get
scrollback to work for more than a few lines. I've added
'fbcon=scrollback:128' to my kernel line in grub.conf but scrollback
is still disabled.

Is there some nvidia specific way to do this?

Re: [gentoo-user] scrollback using framebuffer

[Alan McKinnon]

On Sunday 15 November 2009 00:12:26 Maxim Wexler wrote:
> Hi group,
> 
> I'm using the nvidia framebuffer(CONFIG_FB_NVIDIA=y) but I can't get
> scrollback to work for more than a few lines. I've added
> 'fbcon=scrollback:128' to my kernel line in grub.conf but scrollback
> is still disabled.
> 
> Is there some nvidia specific way to do this?
> 

Yes, use vesa. It's slow at high res, but works.

The nvidia framebuffer does not work with nvidia-drivers

-- 
alan dot mckinnon at gmail dot com

Re: [gentoo-user] scrollback using framebuffer

[Maxim Wexler]

On 11/14/09, Alan McKinnon <alan.mckinnon@gmail.com> wrote:
> On Sunday 15 November 2009 00:12:26 Maxim Wexler wrote:
>
> Yes, use vesa. It's slow at high res, but works.
>
> The nvidia framebuffer does not work with nvidia-drivers

Yeah, I found that out just after mailing the above. But now that I'm using vesa
how do I enable scrollback? 'fbcon=scrollback:128' in the grub kernel
line doesn't work. It's enabled in the kernel and works fine without
the fb, if that matters.

mw

Re: [gentoo-user] scrollback using framebuffer

[Alan McKinnon]

On Sunday 15 November 2009 05:19:41 Maxim Wexler wrote:
> On 11/14/09, Alan McKinnon <alan.mckinnon@gmail.com> wrote:
> > On Sunday 15 November 2009 00:12:26 Maxim Wexler wrote:
> >
> > Yes, use vesa. It's slow at high res, but works.
> >
> > The nvidia framebuffer does not work with nvidia-drivers
> 
> Yeah, I found that out just after mailing the above. But now that I'm using
>  vesa how do I enable scrollback? 'fbcon=scrollback:128' in the grub kernel
>  line doesn't work. It's enabled in the kernel and works fine without the
>  fb, if that matters.

It JustWorked for me. My relevant settings:

CONFIG_FB=y
CONFIG_FB_BOOT_VESA_SUPPORT=y
CONFIG_FB_CFB_FILLRECT=y
CONFIG_FB_CFB_COPYAREA=y
CONFIG_FB_CFB_IMAGEBLIT=y
CONFIG_FB_VESA=y
CONFIG_VGACON_SOFT_SCROLLBACK=y
CONFIG_VGACON_SOFT_SCROLLBACK_SIZE=256

I have no settings for scrollback on the kernel command line, just this to set 
the resolution etc:

vga=0x37D ywrap mtrr:4

-- 
alan dot mckinnon at gmail dot com

Re: [gentoo-user] scrollback using framebuffer

[Justin]

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Maxim Wexler wrote:
> On 11/14/09, Alan McKinnon <alan.mckinnon@gmail.com> wrote:
>> On Sunday 15 November 2009 00:12:26 Maxim Wexler wrote:
>>
>> Yes, use vesa. It's slow at high res, but works.
>>
>> The nvidia framebuffer does not work with nvidia-drivers
> 
> Yeah, I found that out just after mailing the above. But now that I'm using vesa
> how do I enable scrollback? 'fbcon=scrollback:128' in the grub kernel
> line doesn't work. It's enabled in the kernel and works fine without
> the fb, if that matters.
> 
> mw
> 
Ty this here


│ CONFIG_VGACON_SOFT_SCROLLBACK_SIZE:


                                                         │
  │


                                                           │
  │ Enter the amount of System RAM to allocate for the scrollback


                                                           │
  │ buffer.  Each 64KB will give you approximately 16 80x25


                                                           │
  │ screenfuls of scrollback buffer


                                                           │
  │


                                                           │
  │ Symbol: VGACON_SOFT_SCROLLBACK_SIZE [=256]


                                                           │
  │ Prompt: Scrollback Buffer Size (in KB)


                                                           │
  │   Defined at drivers/video/console/Kconfig:37


                                                           │
  │   Depends on: HAS_IOMEM && VT && VGACON_SOFT_SCROLLBACK


                                                           │
  │   Location:


                                                           │
  │     -> Device Drivers


                                                           │
  │       -> Graphics support


                                                           │
  │         -> Console display driver support


                                                           │
  │           -> VGA text console (VGA_CONSOLE [=y])


                                                           │
  │             -> Enable Scrollback Buffer in System RAM
(VGACON_SOFT_SCROLLBACK [=y])

                                                                         │


I am using 256kb with 1050x1680 resolution.



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Re: [gentoo-user] scrollback using framebuffer

[Maxim Wexler]

>
> CONFIG_FB=y
> CONFIG_FB_BOOT_VESA_SUPPORT=y
> CONFIG_FB_CFB_FILLRECT=y
> CONFIG_FB_CFB_COPYAREA=y
> CONFIG_FB_CFB_IMAGEBLIT=y
> CONFIG_FB_VESA=y
> CONFIG_VGACON_SOFT_SCROLLBACK=y
> CONFIG_VGACON_SOFT_SCROLLBACK_SIZE=256

Identical to mine.

> I have no settings for scrollback on the kernel command line, just this to
> set
> the resolution etc:
>
> vga=0x37D ywrap mtrr:4

Sure about this? 0x37D is not  a recognized mode. Are you missing some
punctuation?

my line is:  video=vesafb:ywrap,mtrr vga=0x318. Is this syntax
correct? There seems to be a variety out there. Mine only scrolls a
few lines, doesn't matter If I give scrollback 128 or 256k. But there
are no errors, so I must be doing something right. Tried ypan too, no
luck.

mw

Re: [gentoo-user] scrollback using framebuffer

[Alan McKinnon]

On Tuesday 17 November 2009 07:48:21 Maxim Wexler wrote:
> > CONFIG_FB=y
> > CONFIG_FB_BOOT_VESA_SUPPORT=y
> > CONFIG_FB_CFB_FILLRECT=y
> > CONFIG_FB_CFB_COPYAREA=y
> > CONFIG_FB_CFB_IMAGEBLIT=y
> > CONFIG_FB_VESA=y
> > CONFIG_VGACON_SOFT_SCROLLBACK=y
> > CONFIG_VGACON_SOFT_SCROLLBACK_SIZE=256
> 
> Identical to mine.
> 
> > I have no settings for scrollback on the kernel command line, just this
> > to set
> > the resolution etc:
> >
> > vga=0x37D ywrap mtrr:4
> 
> Sure about this? 0x37D is not  a recognized mode. Are you missing some
> punctuation?

Nope, that's exactly how it is in grub. I have a 1920x1440 screen and I get as 
many 8x8 characters as can fit

I got the 0x37D parameter by the table shown with vga=ask

> my line is:  video=vesafb:ywrap,mtrr vga=0x318. Is this syntax
> correct? There seems to be a variety out there. Mine only scrolls a
> few lines, doesn't matter If I give scrollback 128 or 256k. But there
> are no errors, so I must be doing something right. Tried ypan too, no
> luck.

And I get 32k worth of scrollback. There's a setting for this in menuconfig:

Device Drivers -> Graphics support -> Console display driver support

what is yours set to?

I must admit, the fb situation is very confusing and the Documentation 
directory seems to be a mixture of old, new, wrong and just flat out obsolete 
stuff. One has to read the code to find out what is supported it seems

-- 
alan dot mckinnon at gmail dot com