I just installed Debian testing branch in a new laptop Toshiba Satellite C75D-B7260, am6 CPU
This is output of inxi -G:

Code: Select all

ckosloff@notosh:~$ inxi -G
Graphics:  Card: Advanced Micro Devices [AMD/ATI] Mullins [Radeon APU A4-6000 with R2 Graphics]
           Display Server: X.Org 1.16.0 drivers: fbdev,ati,radeon (unloaded: vesa)
           Resolution: 1600x900@0.00hz
           GLX Renderer: Gallium 0.4 on llvmpipe (LLVM 3.4, 128 bits) GLX Version: 3.0 Mesa 10.2.4

the mentioned drivers are loaded , I can post more info like the xorg log but it is too big to do so now.
Thanks in advance.

Please supply the output of "kscreen-console bug".

Hi Mr. Cooksley,
Thanks for answer as usual, and sorry for neglecting to close this issue.
The reason additional monitor was not being recognized is that my video card:
Graphics: Card: Advanced Micro Devices [AMD/ATI] Mullins [Radeon APU A4-6000 with R2 Graphics]
Display Server: X.Org 1.16.0 drivers: fbdev,ati,radeon (unloaded: vesa)
Resolution: 1600x900@0.00hz
GLX Renderer: Gallium 0.4 on llvmpipe (LLVM 3.4, 128 bits) GLX Version: 3.0 Mesa 10.2.4
is too new for the latest kernel version in the Debian testing branch: 3.14-2-amd64 #1 SMP Debian 3.14.13-2 (2014-07-24) x86_64 GNU/Linux,
I tested with the latest stable kernel in kernel.org 3.16, but I had to get it from a Debian derivative called siduction because Debian has not released yet that kernel, which is slated to ship with upcoming Debian 8.
Kernel 3.16 works with the new Mullins card, so it is just a matter of waiting until everything gets adjusted.

And here is output of kscreen-console bug, I did not even know that command existed, so thanks for the info.

ckosloff@notosh:~$ kscreen-console bug
START
kscreen-console(3277) BackendLoader::init: "/usr/lib/x86_64-linux-gnu/kde4/plugins"
Config::current() took 4 milliseconds

========================xrandr --verbose==========================

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1600 x 900, current 1600 x 900, maximum 1600 x 900
default connected primary 1600x900+0+0 (0x182) normal (normal) 0mm x 0mm
Identifier: 0x181
Timestamp: 24572
Subpixel: unknown
Clones:
CRTC: 0
CRTCs: 0
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
1600x900 (0x182) 0.000MHz *current
h: width 1600 start 0 end 0 total 1600 skew 0 clock 0.00KHz
v: height 900 start 0 end 0 total 900 clock 0.00Hz


========================Outputs===================================

KScreen version: 1.0.2.1
Screen:
maxSize: QSize(1600, 900)
minSize: QSize(1600, 900)
currentSize: QSize(1600, 900)

-----------------------------------------------------

Id: 385
Name: "default"
Type: "Unknown"
Connected: true
Enabled: true
Primary: true
Rotation: 1
Pos: QPoint(0,0)
MMSize: QSize(0, 0)
Size: QSize(1600, 900)
Clones: None
Mode: "386"
Preferred Mode: "386"
Preferred modes: ()
Modes:
"386" "1600x900" QSize(1600, 900) 0
EDID Info:
Unavailable

========================Configurations============================

Configs in: "/home/ckosloff/.kde/share/apps/kscreen/"
Number of files: 3

"09c28220f4fa5f6d06a2d64ef261ace8"
"[
{
"enabled" : true,
"id" : "e4673ef2f4c76c8ebe4528164fa5c91f",
"metadata" : {
"fullname" : "xrandr-Chimei Innolux Corporation",
"name" : "eDP"
},
"mode" : {
"refresh" : 60.0076,
"size" : {
"height" : 900,
"width" : 1600
}
},
"pos" : {
"x" : 1920,
"y" : 54
},
"primary" : true,
"rotation" : 1
},
{
"enabled" : true,
"id" : "1b326947589e05a9ba5a456d777c38b7",
"metadata" : {
"fullname" : "xrandr-ViewSonic Corporation-VX2252 Serie-TVR142330308",
"name" : "HDMI-0"
},
"mode" : {
"refresh" : 60.0,
"size" : {
"height" : 1080,
"width" : 1920
}
},
"pos" : {
"x" : 0,
"y" : 0
},
"primary" : false,
"rotation" : 1
}
]"

"c21f969b5f03d33d43e04f8f136e7682"
"[
{
"enabled" : true,
"id" : "default",
"metadata" : {
"name" : "default"
},
"mode" : {
"refresh" : 0.0,
"size" : {
"height" : 900,
"width" : 1600
}
},
"pos" : {
"x" : 0,
"y" : 0
},
"primary" : true,
"rotation" : 1
}
]"

"c98695d7385c437a0f2a5f216a78464c"
"[
{
"enabled" : true,
"id" : "e4673ef2f4c76c8ebe4528164fa5c91f",
"metadata" : {
"fullname" : "xrandr-Chimei Innolux Corporation",
"name" : "eDP"
},
"mode" : {
"refresh" : 60.0076,
"size" : {
"height" : 900,
"width" : 1600
}
},
"pos" : {
"x" : 0,
"y" : 0
},
"primary" : true,
"rotation" : 1
}
]"

ckosloff@notosh:~$

From what I can tell based on that output it is only aware of a HDMI and eDP port - no VGA port appears to be present. In addition, only one screen is connected, and the graphics card appears to only have 1 CRTC - meaning it can only drive one display.

Assuming you have a compatible Kernel/X combination, have you tried installing the fglrx drivers?

Mr. Cooksley,
Thanks for answer, please consider this issue closed, there is no need for the fglrx driver.
The problem is indeed that the kernel in Debian testing is too old and does not support latest hardware.
I tested with the latest 3.16 stable Linux kernel, installed from siduction distro, and video works fine both HDMI and VGA, tested them.
Debian is a bit slow to update because the distro is so big and there are so many packages that have to run in harmony.
All this will be solved in upcoming Debian 8, until the next generation of hardware