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**oshunluvr** · Nov 11, 2010, 05:39 PM

Re: KDE can't detect second monitor

Didi you cut-and-paste that from your xorg.conf? I see several typos if so. Also, twinview and two x sessions are not compatible.

It appears the 173 driver is the correct version for the Quadro FX 1100 card. Are you using that driver?

Read carefully through /var/log/Xorg.0.log and see what it tells you.
try a very basic xorg.conf like this

Code:

 
Section "ServerLayout"
  Identifier   "DualSreen"
  Screen    0 "Screen0"
  Screen    1 "Screen1" RightOf "Screen0" #Screen1 at the right of Screen0
  Option     "Xinerama" "1" #To move windows between screens
EndSection

Section "Monitor"
  Identifier   "Monitor0"
  Option     "Enable" "true" 
EndSection

Section "Monitor"
  Identifier   "Monitor1"
  Option     "Enable" "true"
EndSection

Section "Device"
  Identifier   "Device0"
  Driver     "nvidia"
  Screen     0
EndSection

Section "Device"
  Identifier   "Device1"
  Driver     "nvidia"
  Screen     1
EndSection

Section "Screen"
  Identifier   "Screen0"
  Device     "Device0"
  Monitor    "Monitor0"
  DefaultDepth  24
  Option     "TwinView" "0"
  SubSection "Display"
    Depth     24
    Modes     "1280x800_75.00"
  EndSubSection
EndSection

Section "Screen"
  Identifier   "Screen1"
  Device     "Device1"
  Monitor    "Monitor1"
  DefaultDepth  24
  Option     "TwinView" "0"
  SubSection "Display"
    Depth     24
  EndSubSection
EndSection

**peabrane** · Nov 13, 2010, 04:05 PM

Re: KDE can't detect second monitor

Thanks for the response.

Yes, I am using the 173 drivers. I have even downloaded the latest from the Nvidia website (I am now using the 173.14.28 version). No change from the 173.14.22 I started off with. Also I had (until a few days ago) a Kubuntu 9.10 partition which showed the same effects which used an even earlier version of the drivers.

What I listed above was from the xorg.conf file. I have edited it several times to try and cure the problem so I may have introduced an error or two. I'll recopy from Nvidia-settings.

Thanks for the suggested xorg.conf I'll try that as well.

However, I can't do anything for a week as I have lent my second monitor to my neighbour while he replaces his broken one. So until I get it back, I can't effectively test any of this.

As I have now backed up my 10.04 partition, I will also put up 10.10 and see if that makes any difference.

I'll report back in a week on how I got on.

Thanks again.

**peabrane** · Nov 13, 2010, 04:28 PM

Re: KDE can't detect second monitor

I meant to add that I have looked through the /var/log/Xorg.0.log file and the /var/log/kdm ones and have not seen anything suspicious in them.

**oshunluvr** · Nov 14, 2010, 11:15 AM

Re: KDE can't detect second monitor

If you've downloaded and installed from the nvidia website you'll likely need to go to their forums for help. The packages available from the Kubuntu repos aren't configured exactly the same.

**peabrane** · Nov 14, 2010, 02:15 PM

Re: KDE can't detect second monitor

Hi oshunluvr

I only downloaded the latest from Nvidia to try and cure the problem I already had. It didn't make a bit of difference. But many thanks for the warning. I'll reinstate the Kubuntu version.

**peabrane** · Nov 18, 2010, 05:09 PM

Re: KDE can't detect second monitor

I have now had the opportunity to play around with this a bit further. I have tried xorg.conf files reloaded from nvidia-xsettings and from oshunluvr's suggestion. With either xorg.conf, the problem seems to revolve around the Xinerama option. With the option set to "0" as in the xorg.conf in my first post, I get one monitor working OK and the second blank with only a cross mouse cursor visible. Other than no second monitor, everything is OK.

With xinerama set to 1, I fail to get to the log-in screen. I get odd patterns of ASCII characters repeated anywhere from 2 to 9 times in varying colours and often flashing and often repeated on the second screen. The last 20 lines of the /var/log/Xorg.0.log file are as follows....

(WW) NVIDIA(1): Disabling 32-bit ARGB GLX visuals.
(--) Depth 24 pixmap format is 32 bpp
(II) NVIDIA(0): Initialized AGP GART.
(II) NVIDIA(0): Setting mode "nvidia-auto-select"
(II) Loading extension NV-GLX

Backtrace:
0: /usr/bin/X (xorg_backtrace+0x3b) [0x80eaadb]
1: /usr/bin/X (0x8048000+0x610fd) [0x80a90fd]
2: (vdso) (__kernel_rt_sigreturn+0x0) [0xe2d410]
Segmentation fault at address (nil)

Caught signal 11 (Segmentation fault). Server aborting

Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
Please also check the log file at "/var/log/Xorg.0.log" for additional information.

ddxSigGiveUp: Closing log

--------------------------
So I had been trying to concentrate on Xinerama "0" as that seemed to get me further. Looks like I should have been worrying about "1" non-operation.

I have checked that the xinerama extensions are installed. Perhaps I need to uninstall and reinstall them?

Otherwise, I have no idea where to go from here.

**peabrane** · Nov 19, 2010, 05:05 AM

Re: KDE can't detect second monitor

OK, sorted it out.

Reloaded the nvidia-glx-173 driver and it all burst into life.

I guess I was suffering from a failing graphics card. In desperation, downloaded the latest nvidia drivers from their site, gave myself another problem which I could not see until I replaced my graphics card. It was made worse because both problems looked similar.

Computers, don't you just love them?

Thanks to oshunluvr for the advice, it did help me think it through.

**oshunluvr** · Nov 19, 2010, 07:43 PM

Re: KDE can't detect second monitor

I didn't do much, but thanks for the acknowledgement. In the "old" days (2 years ago) it took days if not weeks to configure my dual monitors. Now it's almost right-out-of-the-box for me.

Old devices are as bad as the bleeding edge new ones. Time to save for a nice 8800gt or higher card!

**peabrane** · Nov 21, 2010, 05:32 PM

Re: KDE can't detect second monitor

To get an 8800gt I would first have to save up for a PC with a PCI-E bus (if I read the spec correctly). As I don't use heavy graphic software, it would be a bit of an overkill for me! Just occasionally, I need a lot of windows open all at the same time and 2 monitors solves that for me.

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