Date: Sun, 14 Jun 2009 13:27:34 +0100
From: "Dr. David Alan Gilbert" <linux@treblig.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.{28,30} Keyboard not working on oldish machine
Message-ID: <20090614122734.GA1499@gallifrey>
References: <20090613230842.GA18347@gallifrey> <4A349B67.1070603@zytor.com>
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* H. Peter Anvin (hpa@zytor.com) wrote:
> Dr. David Alan Gilbert wrote:
> > Hi,
> >   I've got an old Pentium 90 machine that's been running a 2.4.x
> > kernel for a long time, seems to work OK on a 2.6.18 kernel
> > but doesn't seem to like anything newer.
> > 
> > 2.6.30 no keyboard - but otherwise OK
> > 2.6.28 no keyboard - but otherwise OK
> > 2.6.26 reboots just after parsing ELF (maybe one more line)
> > 2.6.25 reboots almost immediately
> > 2.6.18 works OK
> > 
> > The 2.6.18 and 26 are Debian kernels (etch and lenny), the
> > rest are vanilla from git.
> > 
> > So it looks like something got fixed between 26 and 28 that
> > stops the early reboot.
> > 
> > Attached is the .config from the 2.6.30 and a dmesg from that boot.
> > /proc/interrupts shows 8 interrupts on interrupt 1 from the i8042
> > but it doesn't go up if I type.  I've tried a couple of different
> > keyboards, so I don't think it's just a dislike for the keyboard.
> > 
> > I can see a /sys entry for the i8042 - I just don't get any input.
> > 
> > It has an ISA VGA card (Trident 1M) (I needed the PCI slots
> > for another net card!).
> > 
> > I compiled it on a 64bit Ubuntu machine.
> > 
> > [    0.000000] Linux version 2.6.302.6.30gort1 (dg@davros) (gcc version 4.4.0 (Ubuntu 4.4.0-5ubuntu1) ) #2 Sat Jun 13 18:18:17 BST 2009
> 
> It would be good to try an unmodified 2.6.30 kernel here...

It is unmodified - I just set the local version during the config (and forgot
I should have put a - in).

> > [    0.000000] KERNEL supported cpus:
> > [    0.000000]   Intel GenuineIntel
> > [    0.000000]   AMD AuthenticAMD
> > [    0.000000]   NSC Geode by NSC
> > [    0.000000]   Cyrix CyrixInstead
> > [    0.000000]   Centaur CentaurHauls
> > [    0.000000]   Transmeta GenuineTMx86
> > [    0.000000]   Transmeta TransmetaCPU
> > [    0.000000]   UMC UMC UMC UMC
> > [    0.000000] BIOS-provided physical RAM map:
> > [    0.000000]  BIOS-88: 0000000000000000 - 000000000009f000 (usable)
> > [    0.000000]  BIOS-88: 0000000000100000 - 0000000004000000 (usable)
> 
> Is 64 MB correct for this machine?

Yes.

> 
> > [    3.147416] PNP: No PS/2 controller found. Probing ports directly.
> > [    3.174456] serio: i8042 KBD port at 0x60,0x64 irq 1
> > [    3.174961] serio: i8042 AUX port at 0x60,0x64 irq 12
> > [    3.186312] mice: PS/2 mouse device common for all mice
> 
> It does, correctly, identify the keyboard and mode port, so it's
> somewhat odd that it doesn't get used...

Indeed. The only other observation in the older kernel that works
it detects the AUX port first.

Dave
-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    | Running GNU/Linux on Alpha,68K| Happy  \ 
\ gro.gilbert @ treblig.org | MIPS,x86,ARM,SPARC,PPC & HPPA | In Hex /
 \ _________________________|_____ http://www.treblig.org   |_______/
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