Booting problem with VGA splitter

[unikumi]

Hi All,

I'm using Porteus-Kiosk for signage applications and it works very well, but now i got a little problem.
I want to control two VGA displays simultanously, via an active VGA splitter.

The desired settings are 1024x768, 24bit, 60Hz. In the Porteus-Kiosk wizard I set the lines below:
screen_refresh_rate=60
screen_resolution=1024x768

It starts up well if I connect only one display. It also works if I start up the system with one display, then connect the VGA splitter.
But if I want to start it up with the connected VGA splitter and two displays, it breaks down when the GUI starts to loading. After this, I cannot catch the signal with one monitor or two, it doesn't work.

The listed settings are maximums, so maybe Linux checks something at startup and the splitter makes a measurement mistake, so that it sets incorrect resolution or freq.
Is there a way to skip this check at startup and set these properties directly?

Thanks in advance!

[fanthom]

hello unikumi,

please remaster kiosk ISO, unsquash 003-settings.xzm and delete/rename /opt/porteus-scripts/scale-screens (or similar name) script.
squash 003-settings.xzm back and create new ISO.
you may follow this guide:
http://porteus-kiosk.org/kiosk-customization.html

if that wont help then i have no other ideas at the moment.

[unikumi]

Dear fanthom,

Thank you for your reply, i tried it out for some times, but there is another problem

( History:
1. I made an iso with the desired settings and saved it.
2. On a working live Porteus, I decompressed this iso to /tmp/kiosk_ISO/
3. unsquashed 003-settings.xzm
4. renamed the scale-screen script
5. squashed the files back to /tmp/kiosk_ISO/xzm/003-settings.xzm with the recommended option settings ( -comp xz -b 256K -Xbcj x86 -noappend )
6. ran make_iso.sh so I get /tmp/Portueus-Kiosk.iso
7. I want to boot from USB flash disk so ran isohybrid /tmp/Porteus-Kiosk.iso (UEFI is not available on the target PC)
8. dd if=Porteus-Kiosk.iso of=/dev/sdb )

After these steps, I get this message while booting:
http://kepfeltoltes.hu/150722/WP_201507 ... es.hu_.jpg

I tried it almost three times and got the same but I really don't want to give up!

What would be the problem? Maybe something is wrong with the filesystem (that "filenames" in the message...)?

Please help me, I feel that I'm not so far from the goal Thank you in advance!

[fanthom]

looks like ISO got corrupted somehow. perhaps when it was burned on /dev/sdb.
please test the ISO in VirtualBox. if it works then try burning it on some other usb stick.