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Re: Radeon HD 3470 dual monitors on Squeeze

On Sat, May 05, 2012 at 10:23:53AM -0400, Rob Owens wrote:
> On Sat, May 05, 2012 at 09:05:35AM -0400, Rob Owens wrote:
> > I've been trying to get dual monitors to work on my Squeeze system.
> > Originally I was using both the onboard video and an additional video
> > card.  Now I have two monitors hooked up to the same video card (thanks
> > to a cheap craigslist purchase).
> > 
> > When I begin booting, both monitors give me a display.  But when the
> > boot process gets to the point where text display changes (framebuffer
> > turning on?) one monitor goes blank and I cannot get it working again,
> > even when logged into a GUI.
> > 
> > Both monitors work properly with Knoppix 6.4.4.  I tried using the
> > Knoppix xorg.conf, but that did not work.  Here are some differences
> > between Squeeze and Knoppix:
> > 
> > 				Squeeze		Knoppix
> > kernel:				2.6.32-5	2.6.37
> > xserver-xorg-video-radeon:	1:6.13.1-2	1:6.13.2-1
> > libdrm-radeon1:			2.4.23-0.0	2.4.23-1
> > radeontool:			none		1.6.1-1
> > 
> > I don't know if the above differences are important or not.  
> > 
> > Any ideas why one monitor always goes blank in Squeeze?
> > 
> I just tried booting with a Debian Live CD (Squeeze) and got the same
> behavior.  So at least I'm pretty sure that it's not something specific
> to my own configuration / modifications.
I tried installing xserver-xorg-video-radeon from backports, but that
did not help the situation.  Then I installed kernel 3.2.0-0.bpo.2-amd64
from backports and now I have dual monitors working properly.  They work
with gnome-display-properties and by using xrandr at the command line.

I have not tried "downgrading" the radeon driver back to the version in
stable, so I'm not sure if it was the kernel itself that fixed my
problem or if it was the combination of kernel and radeon driver.


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