linux-fbdev-users

[Linux-fbdev-users] Re DirectFB and the Intel 945GM Chip

[DENNIS H. <dh...@ro...>]

The DirectFB driver for this card (intelfb) complains about the video mode not being set even though I've set it using the kernel parameters passed through grub:

   title Generic 2.6.21 with 945GM-21
        root (hd0,0)
        kernel /bzImage945-21 root=/dev/hda3       video=intelfb:mode=1024x768-16@85,accel=1,hwcursor=1,vram=8

The parameters above are listed in the kernel's fb documentation (Documentation/fb/intelfb.txt).  Does anyone know why this is happening or how to fix it?  

Agp Info:
Linux agpgart interface v0.102 (c) Dave Jones
agpgart: Detected an Intel 945GM Chipset.
agpgart: Detected 7932K stolen memory.
agpgart: AGP aperture is 256M @ 0xd0000000

IntelFB Info:
intelfb: intelfb_init
intelfb: Framebuffer driver for Intel(R) 830M/845G/852GM/855GM/865G/915G/915GM/945G/945GM chipsets
intelfb: Version 0.9.4
intelfb: intelfb_setup
intelfb: options: mode=1024x768-16@85,accel=1,hwcursor=1,vram=8
intelfb: intelfb_pci_register
intelfb: fb aperture: 0xd0000000/0x10000000, MMIO region: 0xeff00000/0x80000
intelfb: 00:02.0: Intel(R) 945GM, aperture size 256MB, stolen memory 7932kB
intelfb: fb: 0xd3012000(+ 0x3012)/0x800000 (0xfba12000)
intelfb: MMIO: 0xeff00000/0x80000 (0xff280000)
intelfb: ring buffer: 0xd3001000/0x10000 (0xfba01000)
intelfb: HW cursor: 0x37fe8000/0x1000 (0xfba11000) (offset 0x3011) (phys 0x37fe8000)
intelfb: options: vram = 8, accel = 1, hwcursor = 1, fixed = 0, noinit = 0
intelfb: options: mode = "1024x768-16@85"
intelfb: Non-CRT device is enabled ( LVDS port ).  Disabling mode switching.
intelfb: Video mode must be programmed at boot time.
intelfb: cleanup

When I try this with a CRT instead of an LCD screen the kernel crashes before I can see anything.

Regards,

D.Hall

Re: [Linux-fbdev-users] Re DirectFB and the Intel 945GM Chip

[Antonino A. D. <ad...@gm...>]

On Thu, 2007-05-03 at 16:57 -0400, DENNIS HALL wrote:
> The DirectFB driver for this card (intelfb) complains about the video
> mode not being set even though I've set it using the kernel parameters
> passed through grub:
> 
>    title Generic 2.6.21 with 945GM-21
>         root (hd0,0)
>         kernel /bzImage945-21 root=/dev/hda3
> video=intelfb:mode=1024x768-16@85,accel=1,hwcursor=1,vram=8
> 
> The parameters above are listed in the kernel's fb documentation
> (Documentation/fb/intelfb.txt).  Does anyone know why this is
> happening or how to fix it?  
> 
> Agp Info:
> Linux agpgart interface v0.102 (c) Dave Jones
> agpgart: Detected an Intel 945GM Chipset.
> agpgart: Detected 7932K stolen memory.
> agpgart: AGP aperture is 256M @ 0xd0000000
> 
> IntelFB Info:
> intelfb: intelfb_init
> intelfb: Framebuffer driver for Intel(R)
> 830M/845G/852GM/855GM/865G/915G/915GM/945G/945GM chipsets
> intelfb: Version 0.9.4
> intelfb: intelfb_setup
> intelfb: options: mode=1024x768-16@85,accel=1,hwcursor=1,vram=8
> intelfb: intelfb_pci_register
> intelfb: fb aperture: 0xd0000000/0x10000000, MMIO region:
> 0xeff00000/0x80000
> intelfb: 00:02.0: Intel(R) 945GM, aperture size 256MB, stolen memory
> 7932kB
> intelfb: fb: 0xd3012000(+ 0x3012)/0x800000 (0xfba12000)
> intelfb: MMIO: 0xeff00000/0x80000 (0xff280000)
> intelfb: ring buffer: 0xd3001000/0x10000 (0xfba01000)
> intelfb: HW cursor: 0x37fe8000/0x1000 (0xfba11000) (offset 0x3011)
> (phys 0x37fe8000)
> intelfb: options: vram = 8, accel = 1, hwcursor = 1, fixed = 0, noinit
> = 0
> intelfb: options: mode = "1024x768-16@85"
> intelfb: Non-CRT device is enabled ( LVDS port ).  Disabling mode
> switching.
> intelfb: Video mode must be programmed at boot time.
> intelfb: cleanup
> 
> When I try this with a CRT instead of an LCD screen the kernel crashes
> before I can see anything.
> 

The intelfb driver cannot set the mode on its own without the help of
the BIOS.  Use the vga= (as you would with vesafb) instead to set the
mode.

Tony

Re: [Linux-fbdev-users] Re DirectFB and the Intel 945GM Chip

[Matteo V. <mat...@ya...>]

--- "Antonino A. Daplas" <ad...@gm...> wrote:

> On Thu, 2007-05-03 at 16:57 -0400, DENNIS HALL
> wrote:
> > The DirectFB driver for this card (intelfb)
> complains about the video
> > mode not being set even though I've set it using
> the kernel parameters
> > passed through grub:
> > 
> >    title Generic 2.6.21 with 945GM-21
> >         root (hd0,0)
> >         kernel /bzImage945-21 root=/dev/hda3
> >
>
video=intelfb:mode=1024x768-16@85,accel=1,hwcursor=1,vram=8
> > 
> > The parameters above are listed in the kernel's fb
> documentation
> > (Documentation/fb/intelfb.txt).  Does anyone know
> why this is
> > happening or how to fix it?  
> > 
> > Agp Info:
> > Linux agpgart interface v0.102 (c) Dave Jones
> > agpgart: Detected an Intel 945GM Chipset.
> > agpgart: Detected 7932K stolen memory.
> > agpgart: AGP aperture is 256M @ 0xd0000000
> > 
> > IntelFB Info:
> > intelfb: intelfb_init
> > intelfb: Framebuffer driver for Intel(R)
> > 830M/845G/852GM/855GM/865G/915G/915GM/945G/945GM
> chipsets
> > intelfb: Version 0.9.4
> > intelfb: intelfb_setup
> > intelfb: options:
> mode=1024x768-16@85,accel=1,hwcursor=1,vram=8
> > intelfb: intelfb_pci_register
> > intelfb: fb aperture: 0xd0000000/0x10000000, MMIO
> region:
> > 0xeff00000/0x80000
> > intelfb: 00:02.0: Intel(R) 945GM, aperture size
> 256MB, stolen memory
> > 7932kB
> > intelfb: fb: 0xd3012000(+ 0x3012)/0x800000
> (0xfba12000)
> > intelfb: MMIO: 0xeff00000/0x80000 (0xff280000)
> > intelfb: ring buffer: 0xd3001000/0x10000
> (0xfba01000)
> > intelfb: HW cursor: 0x37fe8000/0x1000 (0xfba11000)
> (offset 0x3011)
> > (phys 0x37fe8000)
> > intelfb: options: vram = 8, accel = 1, hwcursor =
> 1, fixed = 0, noinit
> > = 0
> > intelfb: options: mode = "1024x768-16@85"
> > intelfb: Non-CRT device is enabled ( LVDS port ). 
> Disabling mode
> > switching.
> > intelfb: Video mode must be programmed at boot
> time.
> > intelfb: cleanup
> > 
> > When I try this with a CRT instead of an LCD
> screen the kernel crashes
> > before I can see anything.
> > 
> 
> The intelfb driver cannot set the mode on its own
> without the help of
> the BIOS.  Use the vga= (as you would with vesafb)
> instead to set the
> mode.
> 
> Tony
> 

Hi,
I had the same problem, and was bitten by the kernel's
intelfb documentation the same way you were.

I eventually settled for the following:
kernel          /boot/vmlinuz root=/dev/hda1 ro
video=intelfb:mode=1024x768-32@75 vga=792

GRUB understands hex, so you can just say vga=0x318,
and avoid converting it to the decimal like I did.

Tony, how much work would you say is required to add
mode setting capabilities to the intelfb driver? I
might be able to donate some time to get this
working... it really bugs me that I can't use the
display at the native 1280x800 resolution.

- Matteo



	
	
		
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Re: [Linux-fbdev-users] Re DirectFB and the Intel 945GM Chip

[Antonino A. D. <ad...@gm...>]

On Fri, 2007-05-04 at 14:31 +0100, Matteo Vescovi wrote:
> --- "Antonino A. Daplas" <ad...@gm...> wrote:
> 
> > On Thu, 2007-05-03 at 16:57 -0400, DENNIS HALL
> > wrote:

> Tony, how much work would you say is required to add
> mode setting capabilities to the intelfb driver?

Documentation, basically.

>  I
> might be able to donate some time to get this
> working... it really bugs me that I can't use the
> display at the native 1280x800 resolution.

Dave Airlie is the current maintainer of intelfb and DRM. AFAIK, he has
preliminary code for this but he hasn't released any of it yet.

Tony