2.6.16-rc5-mm3 -- Can't get fbset or 855resolution to change resolution

2.6.16-rc5-mm3 -- Can't get fbset or 855resolution to change resolution

[Miles Lane]

Hi,

I have a "Intel Corporation 82852/855GM Integrated Graphics Device
(rev 02)" in my laptop.  I am currently running Fedora Core Test3 +
Rawhide updates on it.  I would like to use 1280x768 in my VT
framebuffer displays.  Unfortunately, neither fbset or 855resolution
cause the video mode to change.  I boot with the kernel option
vga=791.  This gives me 1024x768@76, according to fbset.

Specifically, I have tried "fbset -xres 1280 -yres 768 -a" and
"855resolution mode 1280 768".

Currently, fbset says:
mode "1024x768-76"
    # D: 78.653 MHz, H: 59.949 kHz, V: 75.694 Hz
    geometry 1024 768 1024 768 16
    timings 12714 128 32 16 4 128 4
    rgba 5/11,6/5,5/0,0/0
endmode

855resolution version 0.4 says:
Chipset: 855GM (id=0x35808086)
VBIOS type: 2
VBIOS Version: 3360
[...]
Mode 7e : 1280x768, 32 bits/pixel

Any suggestions?  Is this a bug in the mm tree?
       Miles


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Re: 2.6.16-rc5-mm3 -- Can't get fbset or 855resolution to change resolution

[Antonino A. Daplas]

Miles Lane wrote:
> Hi,
> 
> I have a "Intel Corporation 82852/855GM Integrated Graphics Device
> (rev 02)" in my laptop.  I am currently running Fedora Core Test3 +
> Rawhide updates on it.  I would like to use 1280x768 in my VT
> framebuffer displays.  Unfortunately, neither fbset or 855resolution
> cause the video mode to change.  I boot with the kernel option
> vga=791.  This gives me 1024x768@76, according to fbset.
> 
> Specifically, I have tried "fbset -xres 1280 -yres 768 -a" and
> "855resolution mode 1280 768".
> 

If you are using a flatpanel display, then no, you cannot change the
resolution, or anything for that matter, with fbset.

If you are using an analog display, then perhaps you need to give
fbset the entire modeline.  You probably know how to do this, just enter
the modeline in /etc/fb.modes and label it 1280x768-60 for example.

> Currently, fbset says:
> mode "1024x768-76"
>     # D: 78.653 MHz, H: 59.949 kHz, V: 75.694 Hz
>     geometry 1024 768 1024 768 16
>     timings 12714 128 32 16 4 128 4
>     rgba 5/11,6/5,5/0,0/0
> endmode
> 
> 855resolution version 0.4 says:
> Chipset: 855GM (id=0x35808086)
> VBIOS type: 2
> VBIOS Version: 3360
> [...]
> Mode 7e : 1280x768, 32 bits/pixel

I don't know hot 855resolution works....

Tony


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Re: 2.6.16-rc5-mm3 -- Can't get fbset or 855resolution to change resolution

[Miles Lane]

On 3/9/06, Antonino A. Daplas <adaplas@gmail.com> wrote:
> Miles Lane wrote:
> > Hi,
> >
> > I have a "Intel Corporation 82852/855GM Integrated Graphics Device
> > (rev 02)" in my laptop.  I am currently running Fedora Core Test3 +
> > Rawhide updates on it.  I would like to use 1280x768 in my VT
> > framebuffer displays.  Unfortunately, neither fbset or 855resolution
> > cause the video mode to change.  I boot with the kernel option
> > vga=791.  This gives me 1024x768@76, according to fbset.
> >
> > Specifically, I have tried "fbset -xres 1280 -yres 768 -a" and
> > "855resolution mode 1280 768".
> >
>
> If you are using a flatpanel display, then no, you cannot change the
> resolution, or anything for that matter, with fbset.

Xorg's DDC info shows this mode:
*Mode: 7e (1280x768)
        XResolution: 1280
        YResolution: 768
        BitsPerPixel: 32
Is there any way to tell vesafb to use this mode?  I have searched
using Google quite a bit, but come up empty-handed.

855resolution can be used to patch a video mode with different vres
and yres.  It works for me to get 1280x768, but fbcon doesn't increase
the number of columns (stty doesn't help)
so I end up having the characters in the left-hand part of the screen
get redisplayed along the right side of the display, like this:

Here I go to the store.................                         Here I go
This is approximately what I see........                   This is app

You get the idea?

Thanks,
      Miles


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Re: 2.6.16-rc5-mm3 -- Can't get fbset or 855resolution to change resolution

[Antonino Daplas]

On 3/10/06, Miles Lane <miles.lane@gmail.com> wrote:
> On 3/9/06, Antonino A. Daplas <adaplas@gmail.com> wrote:
> > Miles Lane wrote:
>
> Xorg's DDC info shows this mode:
> *Mode: 7e (1280x768)
>         XResolution: 1280
>         YResolution: 768
>         BitsPerPixel: 32
> Is there any way to tell vesafb to use this mode?  I have searched
> using Google quite a bit, but come up empty-handed.

Add 0x200 to the mode id, ie, boot with vga=0x27e.

>
> 855resolution can be used to patch a video mode with different vres
> and yres.  It works for me to get 1280x768, but fbcon doesn't increase
> the number of columns (stty doesn't help)
> so I end up having the characters in the left-hand part of the screen
> get redisplayed along the right side of the display, like this:
>
> Here I go to the store.................                         Here I go
> This is approximately what I see........                   This is app

Understandable, intelfb must recognize the change in resolution.

Tony


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