Ubuntu

Lucid 64bit: Dual display distortion with ATI video card

Asked by johanbondt

Today I installed Lucid Lynx 10.04-64 bits final release on my laptop.
My laptop contains an ATI mobility radeon X1400 Video card.
I tried to connect a second display (HP1530) to my laptop using DVI.
In 9.10-32bits this worked instantly and well. Now the second display gave at first an error message about wrong input.
Now while I try to reproduce the error message, my whole display distorts and mixes colors. I hope my display will get right again.
Does anyone know what is wrong? This looks like a terrible bug.

Thanks.

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Tom (tom6) said : 		#1

Hi :)

I have a 1650 ati card and need to boot through the "recovery mode" from the boot-menu and then choose "failsafe mode" to boot up! This is only with a single monitor! I hope you continue to have more luck than me!

Regards from
Tom :)

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Tommy Sundqvist (pipan) said : 		#2

Hi,
Could this have anything to do with bug #537640?
In that case, try to disable KMS:

echo options radeon modeset=0 > /etc/modprobe.d/radeon-kms.conf

Br Tommy

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Tom (tom6) said : 		#3

Hi :)

I don't know but it's probably worth reading through and giving that a try. I will let you know how it goes on my machine in a couple of days. I have linked this question to the bug report just in case that helps

Good luck and regards from
Tom :)

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johanbondt (johanbondt) said : 		#4

Hi Tommy Sundqvist,
I read bug #537640, but don't exactly know what you mean by

" echo options radeon modeset=0 > /etc/modprobe.d/radeon-kms.conf "

I made a file named radeon-kms.conf in /etc/modprobe.d/ and put the line " echo options radeon modeset=0" in it.(without quote symbols.) Is this what you meant?

This did not solve the problem entirely. After the reboot I connected my external display. At first the screen looks fine, but after a while it starts striping again. Trying other resolutions gives the message" Input signal out of range"
During the second reboot I left the screen connected. Both screens totally distorted again, I couldn't read my laptop screen any more.

I posted my bug as bug #573290 already on the first of May, but it didn't get any attention.
The newest kernel didn't solve my problem either.

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Tommy Sundqvist (pipan) said : 		#5

Hi Johan,
The line shoud be executed from the console. If you write it yourself directly in the file you should leave out "echo". What you want is a /etc/modprobe.d/radeon-kms.conf that contains the line "options radeon modeset=0" (without the quotes)

Br Tommy

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johanbondt (johanbondt) said : 		#6

Thanks Tommy,
After reboot this only gives me an external display saying " Input signal out of range"on all frequencies.
So the problem is still standing.

Gr Johan

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Koopee (koopee1234) said : 		#7

I did not have the display distortion issue, but my suspend was broken. If I connected external display, suspended, removed the external display and resumed, the laptop screen remained blank and I had to reboot or restart X.

options radeon modeset=0 in /etc/modprobe.d/radeon-kms.conf fixed this for me too.

Ubuntu 10.10 Maverick

K-P

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