Ubuntu 10 install Fails - Screen Goes Black

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01 Jan 2011 01:56 #6347 by Highlander01
EMC2 Live Ubuntu 10 install is failing on me. My screen goes black and I never get the nice install screen. (Burnt 2 cd iso.s)

I can do ctl-alt-f1 and get an ubuntu text window but I can not get to nice install screen ctl-alt-f7 gets me a blank screen.

I am trying to install this on a new Intel Atom D525MW that I purchased. 2gb of ram.

I tried Ubuntu 10 install by without EMC2 also and that does the same thing. (Burnt 1 CD iso)

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01 Jan 2011 03:16 #6348 by Highlander01
Figured out my problem. It seems to be varying solution for different pcs. I looked at a posting at ubuntu site and played some:

ubuntuforums.org/showthread.php?p=10302599#post10302599

For me I had ubuntu with 5 pulse dots and then screen would go blank. To fix this I had to hit F6 on boot and then go to F6 again select "nomodest" and hit enter in order to get "x" to show up next to my selection. I then ran install and I am now going thru the install... currently at copying files... 45% and looks good. For others the fix maybe other settings.

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19 Jan 2011 15:21 - 19 Jan 2011 16:01 #6774 by disca
I too have the Intel D525MW atom mobo. I havent had any of the problems you mentioned using "www.linuxcnc.org/lucid/ubuntu-10.04-linuxcnc1-i386.iso" - worked first time. I'm running with a single 2GB So-DIMM (crucial) and an old sata 160GB western digital hard drive - set to AHCI in the bios.

Im using the latest bios - version .74 if I recall correctly.

I have noticed that the Parallel port is detected wrong - i.e it doesnt enumerate as epp/ecp etc. Have you spotted that yet?

Latency tests appear to be very good on this board. With hyperthreading disabled, isolcpus=1 in grub config It is staying under 5000 even while being "hammered" with glxgears and application openings etc. With hypertheading enabled and isolcpus not set - it doesnt go above 10-11k and averages around 6000.
Last edit: 19 Jan 2011 16:01 by disca.

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24 Jan 2011 13:59 #6823 by andypugh
disca wrote:

I have noticed that the Parallel port is detected wrong - i.e it doesnt enumerate as epp/ecp etc. Have you spotted that yet?


it is very likely that this is the same issue as seen on the D510MO, so I suspect that the same, existing, workarounds in EMC2 will work.
Please report back if that is not the case (you will see a problem with Pico PPMC or Mesa 7i43 cards if there is an issue)

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31 Jan 2011 00:21 #6883 by jbraun
andypugh wrote:

it is very likely that this is the same issue as seen on the D510MO, so I suspect that the same, existing, workarounds in EMC2 will work.


And what might those be ?
My stepper board specifies epp and the d510mo isn't cooperating

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31 Jan 2011 10:40 #6892 by andypugh
jbraun wrote:

And what might those be ?
My stepper board specifies epp and the d510mo isn't cooperating


Unfortunately the workaround is in the Hostmot to and pico ppmc driver code.

What sort of stepper board do you have? EMC2 generally does parport step generation with direct inb() and outb() access to the port, there is no intervening driver, nor is there any possible way that EPP is even relevant.

So, either the stepper board needs a driver, or EPP is a red-herring.

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31 Jan 2011 13:06 #6897 by jbraun
It's one of those Gecko G540 all-in-wonder drives. According to the manual;

"Your parallel port must be set to EPP mode in BIOS for the parallel port to work correctly with the G540. If it is not in EPP mode
some functions of the G540 will not work"

BIOS is set to EPP but from dmesg
parport0 0x378 [PCSPP], whatever that means.

Gecko assumes Mach3, EPP may be irrelevant running emc. We'll see.

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31 Jan 2011 13:36 #6898 by andypugh
jbraun wrote:

Gecko assumes Mach3, EPP may be irrelevant running emc. We'll see.


Looking at the pinout, I think it will work with EMC2 in any mode.

Note, however, that it needs a charge pump output on pin16 to enable the G540. EMC2 can easily do this (I am fairly sure it is an option in Stepconf),

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01 Feb 2011 16:32 #6934 by jbraun
After a bit of searching of the Gecko forum......

You've hit on the reason Gecko insists on EPP. If EPP mode is not enabled the charge pump will not function.
It's one of the reasons Gecko added a charge pump bypass switch. If the charge pump is bypassed
additional relays and spindle control may not (won't ?) work as expected. Again, this is from a Windows/Mach3
perspective and may not apply to EMC2. In any case I bypassed the charge pump long ago.

All is good for my needs, thanks for your help :-}

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01 Feb 2011 16:49 #6935 by andypugh
jbraun wrote:

In any case I bypassed the charge pump long ago


I would strongly suggest re-enabling it. EMC2 runs a charge pump happily on any parallel port, and it is a very useful safety feature.
wiki.linuxcnc.org/cgi-bin/emcinfo.pl?About_Charge_Pumps
Given the hard-wired nature of the G540 it isn't like pin 16 can be used for anything else instead.

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