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Date:      Wed, 20 Jan 2010 09:30:34 -0500
From:      Michael Powell <>
Subject:   Re: Missing all ttyv* device nodes after upgrade 7.0 -> 7.2
Message-ID:  <hj741p$ccq$>
References:  <> <> <> <hj5iqn$b4l$> <>

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Morgan Wesström wrote:

>>> These dmesg lines are from another 7.2 machine and I am missing them
>>> from the output of this newly upgraded machine:
>>> sc0: <System console> at flags 0x100 on isa0
>>> sc0: VGA <16 virtual consoles, flags=0x300>
>>> vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on
>>> isa0
> Thanks for your answer Mike. The system is actually an old Celeron on an
> Intel i865 based mainboard so the hardware should be pretty well
> supported I guess and after all - it did work with 7.0. The machine is
> only used as a router so the lack of virtual terminals aren't critical
> but I still would like to solve it. I will have the owner look for a
> more recent BIOS and then I'll reinstall the GENERIC kernel before
> filing a bug report. Here's a more verbose dmesg snippet that might give
> someone a clue:

I have an Asus P5P800SE i865 motherboard here with a Pentium D 940 on it. It 
is currently running 8-Release and does not exhibit this problem. Right now 
there is still an AGP video card in it.
> agp0: <Intel 82865 host to AGP bridge> on hostb0
> agp0: allocating GATT for aperture of size 128M
> vgapci0: <VGA-compatible display> mem
> 0xf8000000-0xf8ffffff,0xe0000000-0xefffffff,0xf9000000-0xf9ffffff irq 3
> at device 0.0 on pci1

This is an odd IRQ for a video card to come up on, as this is usually 
reserved for one of the COMM ports. Maybe an IRQ conflict here.

> isab0: <PCI-ISA bridge> at device 31.0 on pci0
> isa0: <ISA bus> on isab0
> sc: sc0 already exists; skipping it
> vga: vga0 already exists; skipping it
> isa_probe_children: disabling PnP devices
> isa_probe_children: probing non-PnP devices
> pmtimer0 on isa0
> sc0: no video adapter found.
> sc0: <System console> failed to probe on isa0
> vga0: <Generic ISA VGA> failed to probe on isa0
> atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
> vt0: not probed (disabled)
> isa_probe_children: probing PnP devices

Below is a snippet from mine. You didn't remove device vga from the kernel 
by any chance? Switching back to GENERIC for a test is probably a good idea 
as it may remove a variable from the problem.

sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]

The BIOS selection for PnP OS support should be "Off". Irregardless, this 
looks like botched PnP probing by the BIOS. Only idea comes to mind right 
away is if you are using a PCI video card instead of AGP there is a BIOS 
selection which chooses which is initialized first. There is usually also 
one somewhere about whether to assign an IRQ to the video card. IRQ 3 just 
looks wrong. Check the mobo manual for slot sharing. A lot of motherboards 
will do something like share IRQs between the AGP slot and the first PCI 
slot (and/or others as well), with the sharing usually involving the AGP, 
the PCI slot, and USB controller(s). There is usually a chart in the manual 
which shows what is shared and where. I have such a chart in mine. 
> What is that vt0 (disabled)? Is that related? pciconf reports this:
> pcib1@pci0:0:1:0:	class=0x060400 card=0x00000000 chip=0x25718086
> rev=0x02 hdr=0x01
>     vendor     = 'Intel Corporation'
>     device     = '82865G/PE/P, 82848P PCI-to-AGP Bridge'
>     class      = bridge
>     subclass   = PCI-PCI
> isab0@pci0:0:31:0:	class=0x060100 card=0x00000000 chip=0x24d08086
> rev=0x02 hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = '82801EB/ER (ICH5/ICH5R) LPC Interface Bridge'
>     class      = bridge
>     subclass   = PCI-ISA
> vgapci0@pci0:1:0:0:	class=0x030000 card=0x2034107d chip=0x022010de
> rev=0xa1 hdr=0x00
>     vendor     = 'Nvidia Corp'
>     class      = display
>     subclass   = VGA

This is mine (with AGP video card):

vgapci0@pci0:1:0:0:     class=0x030000 card=0x00000000 chip=0x00f110de 
rev=0xa2 hdr=0x00
    vendor     = 'Nvidia Corp'
    device     = 'GeForce 6600 GT AGP (NV43+BR02)'
    class      = display
    subclass   = VGA

Notice in yours above the 'device' line is missing,
> Googling on this turns up a lot of older posts with references to PnP
> incompatibilities and ATA but I can't find any info that helps me with
> syscons.

Funny thing is it worked in 7.0 previously? At first glance this smells like 
BIOS PnP probing problems, but I think if it were it would have showed 
itself before. Try GENERIC and see what happens. If it goes away you know 
where to look. 


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