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SubjectRe: ISSUE: lp locks system when polling printer in 2.2.0pre5
Yep, it's during bootup.  I recompiled with magic-sysrq enabled, and gave
it a try. If I use Alt-SysRq-p right after it gives that "lp0: using
parport0 (polling)" message, it gives me this:

EIP: 0010:[<c0108ae8>] EFLAGS: 00000246
EAX: 00000000 EBX: c02b6320 ECX: 0000000a EDX: c02b6320
ESI: 00000001 EDI: 0000000a EBP: c0003e48 DS: 0018 ES: 0018
CR0: 80050036 CR2: 00000000 CR3: 00101000

If I press any of the SysRq combinations after waiting for another second
or so, none of them work at all (whether I've already used it once or
not). I'm something of a virgin at this, so I'm not sure what I need to do
with this above output... is there some documentation somewhere? I assume
those numbers are meaningless without looking at other things (whatever
those may be :).

The parport messages I get on bootup are as follows:
parport0: PC-style at 0x378 [SPP,PS2]
lp0: using parport0 (polling).


On Sun, 10 Jan 1999, Tim Waugh wrote:

> On Sat, 9 Jan 1999, Eric Furbish wrote:
> > I'm not exactly sure what "polling the printer" means, but I assume it
> > means it's trying to test communication with the printer. The exact
> > kernel message is "lp0: using parport0 (polling)." The code relevant to
> > that printk is in lp.c. There are no print jobs in progress when I
> > reboot, and nothing at all is using the printer driver -- lpd is shutdown
> > alltogether, and nothing else is accessing it as far as I can tell.
> So it's when the machine is booting up that you see the problem? Right, I
> was confused for a while -- I thought you meant during the shutdown -r
> sequence.
> The message just means that when the printer driver _is_ used, it will
> poll the printer to see when it's ready, instead of using interrupts to
> find out.
> Do you have magic-sysrq enabled? Try Alt-SysRq-P to find out the program
> counter, and see where that is in the kernel.
> It's more likely that the next driver in line for initialisation is the
> one you're having trouble with, but in case it's lp, what parport messages
> do you see on boot-up?
> Tim.
> */

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