[Bug 73403] New: Xorg segfaults when using --setprovideroutputsource

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73403

          Priority: medium
            Bug ID: 73403
          Assignee: xorg-driver-ati at lists.x.org
           Summary: Xorg segfaults when using --setprovideroutputsource
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: tom at recursivedream.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/Radeon
           Product: xorg

Created attachment 91690
  --> https://bugs.freedesktop.org/attachment.cgi?id=91690&action=edit
Xorg log

I have a laptop with hybrid graphics. When attempting to get xrandr to
identify/use an output attached to the discrete card, Xorg segfaults. Here are
my steps:

    startx
    xrandr --setprovideroutputsource 1 0
    xrandr --auto

After the first `xrandr` call, the external monitor shows up in the output
list. So far so good. As soon as I try to activate it with `xrandr --auto`,
Xorg segfaults. Here's the output of `--listproviders`:

    Providers: number : 2
    Provider 0: id: 0x8a cap: 0xb, Source Output, Sink Output, Sink Offload
crtcs: 3 outputs: 5 associated providers: 0 name:Intel
    Provider 1: id: 0x41 cap: 0xf, Source Output, Sink Output, Source Offload,
Sink Offload crtcs: 1 outputs: 1 associated providers: 0 name:radeon

I will also be attaching my xorg.conf.

I should note that when using "glamor" acceleration for the Radeon device, Xorg
does *not* segfault. However, the resulting output is unusable; I don't know
quite how to describe it beyond saying that the picture on the screen is
jumbled/torn up and illegible. This segfault happens when using "exa" (really
any non-glamor) mode; I have no idea what significance (if any) that might
have.

Please let me know what other information will help.

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