[Nouveau] [Bug 95054] New: KDE 5 / Plasma crashes with nouveau "fifo: gr engine fault on channel 2, recovering" or "gr: TRAP ch 2"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95054

            Bug ID: 95054
           Summary: KDE 5 / Plasma crashes with nouveau "fifo: gr engine
                    fault on channel 2, recovering" or "gr: TRAP ch 2"
           Product: xorg
           Version: 7.4 (2008.09)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: matthias.h.nagel at gmail.com
        QA Contact: xorg-team at lists.x.org

I upgraded from KDE 4 to KDE 5/Plasma. Since the nouveau driver keeps crashing
and freezes everything. If I use the proprietary nvidia firmware (NvGrUseFw=1)
together with the nouveau driver everything works fine.

Normally, the crash heralds itself by some disrupted graphics (black boxes on
the desktop) some seconds before everything freezes totally. The crash is
usually triggered by some desktop effect if some item (menu/dialog/window)
fades in or out ("transparency" effect). The crash usually occurs within the
first five minutes after the login. Sometimes even the login crashes (sddm
window manager) because the window manager uses the same fading effect and
triggers the bug, too.

My kernel version is 4.4.7.

Graphic card: "ASUS GeForce GTX 660 PCI 3.0 2GB DDR5"

uname: "Linux 4.4.7-gentoo #2 SMP Thu Apr 21 13:34:23 CEST 2016 x86_64 Intel(R)
Xeon(R) CPU E3-1230 v3 @ 3.30GHz GenuineIntel GNU/Linux"

I also still suffer from bug #93629 and 93630 that also vanish if the
proprietary firmware is used. But I decided to open a new bug, because the
dmesg messages are different.

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