Login problem - half screen black - how to debug

[pcolamar]

Since a couple of days I am having a strange problem with my Ubuntu installation (Lynx 10.04)
After the startup phase, the right half of the screen turns black (see pict) and the keyboard starts responding very, very slowly.
So slow you cannot practically type your passwd in.
You can also notice a pixelated copy of the cursor into the black half.
I have tried without success some solution proposed into this thread (http://ubuntuforums.org/showthread.php?t=1542082)

Can somebody help me debugging the problem ( or suggest a solution)

The PC is an Athlon 64 with ATI x300 on board, MESA driver is used for the videocard (ATI Catalyst compatible with Lucid does not support the card anylonger !)

The problem seems really related to the user selection panel, indeed if I get in via one of the user that does not require passwd, I pass the login screen and everything works fine as long as I do not try to switch user.
Note that booting with Ubuntu 9.04 (I have a triple boot installation), all works fine .

[kr651129]

Can you post your xorg.conf please?

[pcolamar]

Here you go: (Keep in mind that once logged in, all works fine)

---------- xorg.conf
Section "Monitor"
Identifier "Configured Monitor"
EndSection

Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
EndSection

Section "Device"
Identifier "Configured Video Device"
EndSection

Section "ServerFlags"
Option "DontZap" "False"
EndSection
Section "Screen"
Identifier "Default Screen"
Device "ATI Technologies, Inc. Radeon X300 Pro "
Monitor "SyncMaster"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1600x1200" "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1600x1200" "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1600x1200" "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1600x1200" "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1600x1200" "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1600x1200" "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
EndSection

[pcolamar]

bump

[kr651129]

Did you install x86 or 64?

[kr651129]

I may have found a solution for you, try installing the fglrx package

[pcolamar]

Ok, I found the problem.
My 3 years old boy had activated some zoom option of the "Universal Access Preferences" available in the lower left part of the GDM login screen that transforms the left part of the screen in a magnifier lens !
Oh boy ! I could have looked for ages for the root cause if he would not have done it again in front of me.

Thanks anyhow to all.

P.

[pcolamar]

kr651129, unfortunately, my old x300 card is not supported any longer by fglrx.

[bjornjul]

Ok, I found the problem.
My 3 years old boy had activated some zoom option of the "Universal Access Preferences" available in the lower left part of the GDM login screen that transforms the left part of the screen in a magnifier lens !
Oh boy ! I could have looked for ages for the root cause if he would not have done it again in front of me.

Thanks anyhow to all.

P.

Man alive ... same thing happened to me, except the boy is five

The icon in my case was in the low right corner ( Universal access prefrences )

Thanks for the help

[keithclark]

Ok, I found the problem.
My 3 years old boy had activated some zoom option of the "Universal Access Preferences" available in the lower left part of the GDM login screen that transforms the left part of the screen in a magnifier lens !
Oh boy ! I could have looked for ages for the root cause if he would not have done it again in front of me.

Thanks anyhow to all.

P.

How do you get out of the magnifier? I do not see the button on the lower right corner, as the magnifier only shows black and is sitting on top of the entire right hand side of my screen.

Keith