hi,

i'm using kde 4.10 from ubuntu PPA repositories. On a DELL studio XPs1640 with ATI Radeon 3670HD graphic card.
I've installed the new kscreen/libkscreen for this issue, but also tested without.

Here is the problem, I've connected two monitors in addition of my laptop one. One monitor on the vga output port and the other on the displayport output (with a displayport to VGA adapter from KONIG)

1-At startup Displayport is working fine with KDM (but not the VGA).
2- When I log into my session, displayport stop working, but vga start working.

I've tried a couple of manipulations with system setting but nothing works.
So, i've two questions :
1- Does someone already encouter this problem ? Any workaround in the place ?
2- How can I investigate more on this (don't know the log files locations if there is some)? Some tests I could do ?

thanks for your reply!

Can you please provide a screenshot of your KScreen settings, as well as the output of "xrandr"?

Hi, thanks for your reply.

Here is the screenshot from the traditionnal system settings view :
http://s9.postimg.org/63e4ulsv3/kscreen01.png

Here is with kscreen :
http://s10.postimg.org/6o8vd8m49/kscreen02.png

Here is the xrandr output:
daeavelwyn@StudioXPS1640:~$ xrandr
Screen 0: minimum 320 x 200, current 3040 x 900, maximum 8192 x 8192
VGA-0 connected 1600x900+0+0 (normal left inverted right x axis y axis) 442mm x 249mm
1600x900 59.9*+
1280x800 59.8
1152x864 75.0
1280x720 60.0
1024x768 75.1 70.1 60.0
832x624 74.6
800x600 72.2 75.0 60.3 56.2
640x480 72.8 75.0 66.7 60.0
720x400 70.1
HDMI-0 disconnected (normal left inverted right x axis y axis)
LVDS connected 1440x900+1600+0 (normal left inverted right x axis y axis) 353mm x 198mm
1920x1080 60.0 +
1680x1050 60.0
1400x1050 60.0
1280x1024 59.9
1440x900 59.9*
1280x960 59.9
1280x854 59.9
1280x800 59.8
1280x720 59.9
1152x768 59.8
1024x768 59.9
800x600 59.9
848x480 59.7
720x480 59.7
640x480 59.4
DisplayPort-0 connected (normal left inverted right x axis y axis)
1440x900 59.9 +
1280x1024 75.0 60.0
1280x960 60.0
1152x864 75.0
1024x768 75.1 60.0
832x624 74.6
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
daeavelwyn@StudioXPS1640:~$

It would appear that KScreen is not activating (or deliberately deactivating) your display port screen.
Try toggling the on/off switch for that output in KScreen to try to correct the issue.

Thanks for your help!

In fact, i've already tried this, but the strange thing is that toggling the displayport has no effect neither on the screen itself, nor on the old system-settings parameters. It's like there is no communication between kscreen and old system-settings interface, and no communication between kscreen and my displayport and system-settings and my displayport

Which futher tests could I do to have a better debug log ?

So, i've also an HDMI output port, and have bought a HDMI/vga converter, so will try with this as soon as i receive the adapter.

Very odd. You may have run into a bug in KScreen.
You could try forcing the DisplayPort screen to be enabled directly through xrandr.

Code: Select all

xrandr --output DisplayPort-0 --auto

this the message you command send back :

Code: Select all

daeavelwyn@StudioXPS1640:~$ xrandr --output DisplayPort-0 --auto
xrandr: cannot find crtc for output DisplayPort-0
daeavelwyn@StudioXPS1640:~$ sudo xrandr --output DisplayPort-0 --auto
[sudo] password for daeavelwyn:
xrandr: cannot find crtc for output DisplayPort-0

But the screen is recognize on the vga port (HP LE1901w).... I've also bought a HDMI to VGA converter, but kscreen and old system settings don't regocnize the adapter....

Ah - if I recall, Intel graphics cards only have two CRTC units. Certain outputs are only connected to certain CRTC units, and in order to output different resolutions, different CRTC units must be used.

In this case, KScreen has picked the highest supported resolutions for each display, and as the Display Port connector is at the end, it misses out. This may also explain why the HDMI adapter is not working either.

You can test this by disabling the VGA output, which should cause the Display Port output to come to life.

hmmm, ok, i will test as soon as possible (i'm travelling for now), the problem is I'd like to have vga AND displayport at the same time. But perhaps this is a limitation of my graphic card.
Really thanks for your help bcooksley

Not a problem. Whether you can use VGA and Displayport at the same time will depend on the capabilities of your graphics card - it may be possible with the right CRTC layout/configuration. If I recall correctly you can usually drive multiple outputs from the same CRTC as long as the resolution is the same across those outputs.

Hi,

Ok, so i've try many, many things, and nothing works, so, for now, I just stop to lose my time with this. thks for your help