KDE4.2 > system settings >no second screen

[Mark Falcey]

Binary package hint: kdebase

Jaunty KDE4 installed on top of UbuntuStudio on top of ubuntu/gnome, fully updated, standard repository packages only

I have noticed that the KDE help suggests using the Second Screen configuration option in System Settings/Display to select Clone primary screen or Dual Screen. However this is entirely missing from the KDE system settings/display so there is no way to change the screens from default cloned.

I am using the radeonhd driver and an ati HD3650 card with both monitors on separate DVI outputs which are properly identified in the list box and I am able to change screen resolutions etc with no problem. Both screens show up overlapped in the Monitor window and the screen identifier function lists both screen IDs on both screens similarly overlapped.

I use both gnome and KDE on this system and I am able to set a big desktop in gnome using the same driver and screen resolutions.

If you would like any more information, let me know.

[Nicholas A. Suppiah (t-boxmy)]

I am using an R60 and it also does not show the option for clone or dual screen. In the monitor, it just gives the option for screen 1.

My graphics is
-display:0 UNCLAIMED
             description: VGA compatible controller
             product: Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: bus_master cap_list
             configuration: latency=0

[Nicholas A. Suppiah (t-boxmy)]

Running Kubuntu 9.04.

[Mark Falcey (mfalcey)]

Update:

I have been able to finally get a big desktop dual monitor set up using the proprietary fglrx driver but it was not very easy or clear cut how to do so.

 I eventually had to disable randr in /etc/X11/xorg.conf with the following option added in the "Driver" section.

Options "EnableRandR12" "false"

Then I was able to use aticonfig to set a big desktop.

Before doing that, there was no way to get dual monitors to work as a big desktop in KDE/Jaunty with any driver. With randr enabled all the options to set a big desktop with aticonfig or the Catalyst Control Center fail with messages about randr being incompatible with xinerama.

I suspect that I would also be able to disable randr and use xinerama to acheive a big desktop with the Radeon driver but I have not tried that.

[Alex Wauck (awauck)]

It appears this bug is also present in Karmic (KDE 4.2.98).

[john (joao-pe-grande)]

Same problem here
Samsung X20, Intel video, running Kubuntu 9.04
vmlinuz-2.6.28-15-generic

[7oby (tobias-hain)]

I suppose this is a duplicate of this bug:
https://bugs.launchpad.net/ubuntu/+source/kdebase-workspace/+bug/403610

@rudolf,nicholas: try this:
xrandr --output LVDS1 --auto
xrandr --output LVDS1 --right-of DVI1

The output connector names you can get by issuing "xrandr" without parameters.

@mark:
if you reable XRandR 1.2 support again, you could try the same.

But in general krandrtray is broken upstream regarding management of multiple monitors in as linked above.

[john (joao-pe-grande)]

Hi Mark, thanks for the info, I think it is the corrrect direction, however the virtual display size is too small.
Is it possible to extend the display size?

here is the output:
xrandr --output LVDS --auto
xrandr --output LVDS --right-of VGA
xrandr: screen cannot be larger than 2048x2048 (desired size 3080x1050)

[7oby (tobias-hain)]

The original author of this bug had an ATI graphics card and I suppose it's a duplicate of the bug I mentioned before.Report issues to this one.

If you have issues about 2048x2048 limitations on intel chipsets search launchpad for it or check this list:
https://bugs.freedesktop.org/buglist.cgi?query_format=advanced&short_desc_type=allwordssubstr&short_desc=2048&product=xorg&component=Driver%2Fintel&long_desc_type=substring&long_desc=&bug_file_loc_type=allwordssubstr&bug_file_loc=&status_whiteboard_type=allwordssubstr&status_whiteboard=&keywords_type=allwords&keywords=&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&bug_status=RESOLVED&bug_status=VERIFIED&bug_status=CLOSED&emailassigned_to1=1&emailtype1=substring&email1=&emailassigned_to2=1&emailreporter2=1&emailqa_contact2=1&emailcc2=1&emailtype2=substring&email2=&bugidtype=include&bug_id=&chfieldfrom=&chfieldto=Now&chfieldvalue=&cmdtype=doit&order=Importance&field0-0-0=noop&type0-0-0=noop&value0-0-0=

There's definitely a texture limit of 2048 on GMA 9xx chipsets:
https://bugs.freedesktop.org/show_bug.cgi?id=16914#c2
and maybe more. Walkarounds may be possible, but I don't know there state.