LCDproc development and user support list

Text archives Help

[Lcdproc] Problems with Pyramid-Display

Chronological Thread 
  • From: manuel.dejonghe at (Manuel Dejonghe)
  • Subject: [Lcdproc] Problems with Pyramid-Display
  • Date: Tue, 30 Oct 2012 16:55:32 +0100


On 30.10.2012, at 07:28, Markus Dolze <bsdfan at> wrote:

> On 29.10.2012 19:02, Manuel Dejonghe wrote:
>> Hi all,
>> I am currently encountering some problems with some Pyramid Displays that
>> we got. The displayed text seldom makes sense and reacts to keypresses
>> only very very late.
> Which version of LCDproc to you use? Versions prior to 0.5.5 had some
> problems communicating with Pyramid displays.

Yes, version 0.5.5

> Which OS are you using? On Linux there are known problems perhaps
> related to hi-resolution timers. Read

Thank you very much, that did the trick.

As far as I understand, every user of "LCDd -d pyramid" has to expect this
problem, since kernel 2.6.21. I suppose that as well
as the LCDd.conf [pyramid] sections would be where a heads up warning could
be searched for and read.
Or is this a more general problem, rather than to be specific for the
pyramid-display ?

Is there possibly another fix for this problem ? Disabling the highres timers
brings us trouble with the internal clock of virtual machines.
Looking at the code of the pyramid driver (pylcd.c), I see things like
"usleep(50);". That's microseconds. Could it be that the kernel WITH highres
is actually able to do that, and the "old" code relies on the kernels
behaviour beeing a little sloppy without highres ?

>> Is there somewhere some documentation about the protocol spoken to the
>> display ? I'd love to tap that connection for debugging, or also to
>> simulate either side of the communication.
> Yes, there is. I am currently checking if I am allowed to redistribute it.

Thank you, I got an 8 pages "Pyramid Appliance Display USB-Version
Telegrammbeschreibung" by now. The document does not have any information
about copyright, license or distribution restrictions.

kind regards,
Manuel Dejonghe

PrimeKey Labs GmbH
Krantzstr. 7 (Halle 15)
52070 Aachen

Archive powered by MHonArc 2.6.18.

Top of page