Re: [lcd4linux] Problems with Parport and HD44780 driver

[Stefan U. H. <st...@he...>]

Hi  Michael,

Am 06.04.2015 um 04:52 schrieb Michael Reinelt:
>> But when I start lcd4linux I get after a while (but mostly right at
>> startup) the following error:
>>
>>     HD44780: ioctl(/dev/parport1, PPCLAIM) failed: 4 Interrupted
>> system call
>>     HD44780: could not initialize parallel port!
>>     HD44780: start display failed!
>>     Error initializing driver HD44780: Exit!
>>
>> Does this sound like a timing issue?
>
> No, I don't think so. The problem is that PPCLAIM fails.
>
> Regarding the syslog messages from your 2nd post, this sounds like the
> reason for "Interrupted system call"
>
> Maybe something else is using the parport? (some printer wizard, CUPS,
> ...)
thanks for your hint. Then the problem needs to be searched indeed
elsewhere.

Do you have by any chance a hint, how to look for other processes on the
parport? As I'm not a developer myself, I am unware of tools that could
e.g. trace processes that try to access the parport.

Cheers & Thanks,

Stefan.

-- 
Stefan U. Hegner
         <st...@he...>
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