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-   -   Bug#426714: intelfb refuses mode switching (http://www.linux-archive.org/debian-kernel/218512-bug-426714-intelfb-refuses-mode-switching.html)

Moritz Muehlenhoff 12-25-2008 10:04 PM

Bug#426714: intelfb refuses mode switching
 
On Wed, May 30, 2007 at 03:52:39PM +0200, Olaf Zaplinski wrote:
> Package: linux-image-2.6.18-4-686
> Architecture: i386
> Version: 2.6.18.dfsg.1-12etch2
>
> intelfb fails to load on a laptop although there is no reason for this -
> my desktop system loads the module just fine with a LCD display.
>
> Notebook:
> # lspci
> 00:02.0 VGA compatible controller: Intel Corporation 82852/855GM
> Integrated Graphics Device (rev 02)
>
> Desktop:
> # lspci
> 00:02.0 VGA compatible controller: Intel Corporation 82865G Integrated
> Graphics Controller (rev 02)
>
>
> Notebook's dmesg output:
>
> Linux agpgart interface v0.101 (c) Dave Jones
> agpgart: Detected an Intel 855 Chipset.
> agpgart: Detected 892K stolen memory.
> agpgart: AGP aperture is 128M @ 0xf0000000
> intelfb: Framebuffer driver for Intel(R)
> 830M/845G/852GM/855GM/865G/915G/915GM/945G/945GM chipsets
> intelfb: Version 0.9.4
> ACPI: PCI Interrupt 0000:00:02.0[A] -> Link [LNKA] -> GSI 11 (level, low)
> -> IRQ 11
> intelfb: 00:02.0: Intel(R) 855GME, aperture size 128MB, stolen memory 892kB
> intelfb: Non-CRT device is enabled ( LVDS port ). Disabling mode switching.
> intelfb: Video mode must be programmed at boot time.
>
>
> The module is loaded in /etc/initramfs-tools/modules on both machines
> with these lines:
>
> intel_agp
> intelfb mode=1024x768-16@60

Does this error still occur with more recent kernel versions?

If you're running Etch, could you try to reproduce this bug
with the 2.6.24 based kernel added in 4.0r4?
http://packages.qa.debian.org/l/linux-2.6.24.html

Cheers,
Moritz



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Olaf Zaplinski 12-29-2008 07:57 AM

Bug#426714: intelfb refuses mode switching
 
Hello Moritz,

I tried 2.6.24 and 2.6.26-bpo on both machines. On both machines intelfb
now refuses to load with the message "cannot acquire agp".


/etc/initramfs-tools/modules contains:

agp
intel_agp
intelfb mode=1024x768-16@60

I added the agp module, but I do not know exactly if I need that.

Olaf



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Moritz Muehlenhoff 12-29-2008 06:22 PM

Bug#426714: intelfb refuses mode switching
 
On Mon, Dec 29, 2008 at 09:57:22AM +0100, Olaf Zaplinski wrote:
> Hello Moritz,
>
> I tried 2.6.24 and 2.6.26-bpo on both machines. On both machines intelfb
> now refuses to load with the message "cannot acquire agp".
>
> /etc/initramfs-tools/modules contains:
>
> agp
> intel_agp
> intelfb mode=1024x768-16@60
>
> I added the agp module, but I do not know exactly if I need that.

Could you send the output of "lsmod"? It might be that another framebuffer
driver blocks (such as vesafb) is blocking the agp_backend_acquire()
call.

Cheers,
Moritz



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