[Bug 99337] No dual monitor with Radeon R7 240

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99337

--- Comment #4 from Jérôme <jerome at jolimont.fr> ---
> Output name "default" means you're not using the radeon driver 
> but some kind of generic fallback driver. Please attach the 
> corresponding Xorg log file and output of dmesg.

I just attached both files.

I'm sorry if this is due to some misconfiguration of mine. I tried to search
the web for the error messages in Xorg log to sort it out by myself, but to no
avail.

>From a forum thread [1], I understand that 

> Required kernel driver is not loaded. As a result VESA fallback 
> driver is used

But I don't know why this kernel module is not loaded.

In /etc/modprobe.d, radeonfb is blacklisted, but not radeon, and I read that
blacklisting radeonfb has nothing to do with this and is the right thing to do
[2].

BTW, I should mention that this computer used to have an NVidia card and used
nouveau driver. After it broke, I changed for this ATI card and didn't do
anything special to have it supported since xserver-xorg-video-* packages of
all kinds are already installed in Debian, including the radeon one, and it all
worked well, or so did I think.

Please redirect me to forums/StackExchange/anywhere if I'm wasting your time.

[1]
http://www.linuxquestions.org/questions/linux-software-2/debian-change-resolution-4175593854/
[2]
https://forums.opensuse.org/showthread.php/501875-How-to-replace-fglrx-%28AMD-Catalyst%29-with-original-driver?s=7611ada51f704a46b6448961d51c9d87&p=2674872#post2674872

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