gdmgreeter segfaults when XRandR is not available

[Chris Halse Rogers]

Binary package hint: gdm

A recent update (likely:
 [ Matthew Garrett ]
   * debian/patches/63_xrandr_virtual.patch:
     - on randr1.0 drivers, set the virtual to the screen resolution in
       order to avoid panning setups (part of LP: #137517))
caused gdmgreeter to start segfaulting on startup. Upon investigation, I had Xinerama enabled in my xorg.conf (which disables XRandR). After removing the Xinerama option, gdmgreeter starts successfully. I'm using the nvidia-glx-new drivers

I'll attach a backtrace of gdmgreeter with Xinerama enabled.

It's possible that this is a duplicate of bug: #152208, but that bug seems sufficiently different to file a new one.

[Chris Halse Rogers (raof)]

Attached is my xorg.conf. With the ServerFlags section commented, gdm starts. With the ServerFlags section uncommented, gdm doesn't.

[Chris Halse Rogers (raof)]

I'm not familiar with X programming so I'm not sure how correct it is, but this debdiff adds a check for NULL to the 63_xrandr_virtual.patch patch which fixes this for me.

[unf (unforcer)]

Xinerama with XGL is not working properly either.

Using nvidia-glx-new + xinerama

[Matthew Garrett (mjg59)]

gdm (2.20.0-0ubuntu5) gutsy; urgency=low

  * debian/patches/63_xrandr_virtual.patch:
    - check that XRRGetScreenResources returns a structure. LP: #152505

 -- Matthew Garrett <email address hidden> Mon, 15 Oct 2007 01:09:40 +0100

[Forceflow (baertman)]

Maybe this one is a duplicate of this too - not sure: https://bugs.launchpad.net/ubuntu/+bug/152780