[Bug 432521] Re: kdm does not restart X server (that crashed on logout)

Albert Damen albrt at gmx.net
Tue Oct 6 22:09:07 UTC 2009


Testing shows this problem only occurs with KMS active.

Debugging with gdb shows we get a new frontbuffer when we logout and the xserver is reset. However, the new frontbuffer is not connected to the crtc .
in drmmode_set_mode_major we have:
        if (drmmode->fb_id == 0) {
                ret = drmModeAddFB(drmmode->fd,
and because fb_id is not null when the xserver is reset, drmModeAddFB is not called.

Attached patch solves this problem for me. I consider this a proof of
concept patch; upstream may want to fix the issue in a different way (I
don't like I had to add a new public function in drmmode_display.c).

Can someone confirm this patch solves the issue for them as well? If so,
I will forward the bug and patch upstream tomorrow.


** Attachment added: "kubuntu-logout.debdiff"
   http://launchpadlibrarian.net/33171017/kubuntu-logout.debdiff

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kdm does not restart X server (that crashed on logout)
https://bugs.launchpad.net/bugs/432521
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