[Nouveau] [Bug 79823] New: Mozilla apps freeze on startup with nouveau-dri-10.2.1 libs on dual-screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79823

          Priority: medium
            Bug ID: 79823
          Assignee: nouveau at lists.freedesktop.org
           Summary: Mozilla apps freeze on startup with nouveau-dri-10.2.1
                    libs on dual-screen
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: natrio at list.ru
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: Drivers/DRI/nouveau
           Product: Mesa

Created attachment 100709
  --> https://bugs.freedesktop.org/attachment.cgi?id=100709&action=edit
Htop sreenshot

All tested mozilla apps (firefox, thunderbird and seamonkey) freeze on startup
with nouveau-dri-10.2.1 libraries. If nouveau-dri libraries downgraded to
10.1.4, freezes gone, even without restarting x-server.

Freeze localized in forked mozilla process (with ~100% cpu eating), killing
this process can be restore mozilla's startup.

This bug detected only in nouveau dual-screen configuration. Intel dual-screen
works nornally, nouveau single-screen works too.

Arch linux, i686
Linux kernels: 3.14.6-1 and 3.10.42-1 (LTS)
Hardware: GeForce FX5200

/etc/X11/xorg.conf.d/21-nouveau.conf :
Section "ServerLayout"
    Identifier     "dual"
    Screen      0  "Screen0"
    Screen      1  "Screen1" RightOf "Screen0"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Plug-n-play"
    DisplaySize     323    244
    HorizSync       30.0 - 69.0
    VertRefresh     50.0 - 160.0
    Option         "DPMS"
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "TV-0"
    DisplaySize     200    150
EndSection

Section "Device"
    Identifier     "Videocard0"
    Driver         "nouveau"
    BusID          "PCI:1:0:0"
    Screen          0
    Option          "ZaphodHeads" "VGA-1"
EndSection

Section "Device"
    Identifier     "Videocard1"
    Driver         "nouveau"
    BusID          "PCI:1:0:0"
    Screen          1
    Option          "ZaphodHeads" "TV-1"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Videocard0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    Modes       "1024x768_85"
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Videocard1"
    Monitor        "Monitor1"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    Modes       "720x576"
    EndSubSection
EndSection

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