Xorg distord desktop on VIA Technologies, Inc. VX900 Graphics

[benjibasson]

Hi,
I have downloaded Porteus 4.0 to use it on the Igel 's computer with VIA hardware.
VIA Technologies, Inc. VX900 Graphics

Screen Fujitsu l19t-1
Size 1368*768

But I noticed a bug with Xorg that:
-Distort Desktop display at 45° for rectangular screen
-Distord opened windows
-Distort panels, icons and menu
No problem with square screen Same computer.

This is a bug because it is a regression: last porteus it worked perfect was 3.2.2 with same computer, same screen, and bug occure since Porteus 4.0
I have never used external neither restricted driver for this computer

Bad environment display


Correct mouse cursor in front of display


this big doesn't impact mouse cursor, neither mouse driving: the I stay Vertical for exemple. thus more the mouse is down, more its offset increase in X from the grafic environnement
Consol stay displayed perfect when we do ctrl alt fx


How to reproduce:
1) Install porteus 4.0 on usb. I have choosen 4.0 X86-64 xfce
2) boot the fresh install with the option always fresh
3) as soon as grafic environnement is loaded: it is redriving 45° instead of vertical sizes of screen
this s the startup movie
http://dl.free.fr/vkLAlVsCc

How to know if it is xorg's bug and not xfce: boot with the option always fresh and add noload=xfce. Log as root and startX. then right click on X environment.


Here are logs:
Xorg
https://pastebin.com/CFvPNC6p

Message
https://pastebin.com/Lu7cAWQH

Dmesg
https://pastebin.com/f2h4Unu7

Debug
https://pastebin.com/Bsvg8zL1


Thanks for your help.
Cheers
.

[benjibasson]

Hi, i am afraid because I have no news.

With porteus 4.0, my screen take 3 pixel more offset per line: how to temove offset please?

The command xvidtune is missing so I cannot calibrate my monitor's resolution.

[Rava]

Is your machine capable of running a live OS from a CD or from a DVD?

Due to the known capabilities in hardware debugging, I recommend you start your machine with a different Linux - with the most recent Knoppix.

https://www.knopper.net/knoppix/index-en.html

Hopefully this gives you more info about the possible reason for Porteus 4.0 acting this weird.

[benjibasson]

Hi, unfortunately this computer doesn't have any cd reader.

But with any other linux it will fail because of tiny ram size 1go.

However with this other Linux ( porteus Linux 3.2.2) this bug never occurred. With same monitor. Same igel ( via technology)


With porteus Linux with dell square monitor I have no problems.
With lg monitors I get black screen

Cheers.

[nanZor]

To cure your 45 degree screen, if you can open up a terminal, or possibly a virtual terminal to make it easier, (ctrl-alt-f2), try resetting it back to normal with:

Code: Select all

xrandr -o normal

You'll have to type on a slant, or perhaps type in the blind, but if it works, reboot and see if that fixed a stuck bit. You don't have to be root, a normal user can execute this.

Note that there is no "e" in the command. I always get bit by trying to issue xrander

If the command works, but does not survive a reboot, perhaps put

xrandr -o normal

in your rc.local file. I just tried it for kicks, using 'left' and 'right' too, and emulated an old Alto computer....