https://bugs.freedesktop.org/show_bug.cgi?id=70388

--- Comment #12 from Rostislav Krasny <rosti.bsd-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
(In reply to comment #6)
> For setting agpmode:
> 
> Add nouveau.agpmode=4 (or =0) on the kernel command line.

I tried both and neither had helped.

Fortunatelly I've found backtraces like following in /var/log/kdm.log-20131014
and in /var/log/kdm.log

(EE) [mi] EQ overflowing.  Additional events will be discarded until existing
events are processed.
(EE)
(EE) Backtrace:
(EE) 0: /usr/bin/X (mieqEnqueue+0x21b) [0x81d417b]
(EE) 1: /usr/bin/X (QueuePointerEvents+0x6c) [0x8092c5c]
(EE) 2: /usr/bin/X (xf86PostMotionEventM+0x253) [0x80e06d3]
(EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so (_init+0x31c7) [0xb70d7147]
(EE) 4: /usr/bin/X (DPMSSupported+0xc6) [0x80cfb56]
(EE) 5: /usr/bin/X (xf86SerialModemClearBits+0x19b) [0x80fb15b]
(EE) 6: ? (?+0x19b) [0xb77d259a]
(EE) 7: ? (?+0x19b) [0xb77d25af]
(EE) 8: /lib/libc.so.6 (ioctl+0x19) [0xb73669a9]
(EE) 9: /lib/libdrm.so.2 (drmIoctl+0x40) [0xb758ebd0]
(EE) 10: /lib/libdrm.so.2 (drmCommandWrite+0x3f) [0xb759147f]
(EE) 11: /lib/libdrm_nouveau.so.2 (nouveau_bo_wait+0xa6) [0xb6d38146]
(EE) 12: /usr/lib/xorg/modules/drivers/nouveau_drv.so (_init+0x693a)
[0xb6d4df2a]
(EE) 13: /usr/lib/xorg/modules/drivers/nouveau_drv.so (_init+0x6f91)
[0xb6d4eb11]
(EE) 14: /usr/bin/X (DRI2SwapBuffers+0x36e) [0x81c48ce]
(EE) 15: /usr/bin/X (DRI2GetParam+0xcc4) [0x81c65e4]
(EE) 16: /usr/bin/X (SendErrorToClient+0x3dd) [0x807a87d]
(EE) 17: /usr/bin/X (_init+0x4659) [0x806c6d9]
(EE) 18: /lib/libc.so.6 (__libc_start_main+0xf3) [0xb7292963]
(EE) 19: /usr/bin/X (_start+0x21) [0x806887a]
(EE)
(EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up
the stack.
(EE) [mi] mieq is *NOT* the cause.  It is a victim.
(EE) [mi] EQ overflow continuing.  100 events have been dropped.
(EE)
(EE) Backtrace:
(EE) 0: /usr/bin/X (mieqEnqueue+0xe8) [0x81d4048]
(EE) 1: /usr/bin/X (QueuePointerEvents+0x6c) [0x8092c5c]
(EE) 2: /usr/bin/X (xf86PostMotionEventM+0x253) [0x80e06d3]
(EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so (_init+0x31c7) [0xb70d7147]
(EE) 4: /usr/bin/X (DPMSSupported+0xc6) [0x80cfb56]
(EE) 5: /usr/bin/X (xf86SerialModemClearBits+0x19b) [0x80fb15b]
(EE) 6: ? (?+0x19b) [0xb77d259a]
(EE) 7: ? (?+0x19b) [0xb77d25af]
(EE) 8: /lib/libc.so.6 (ioctl+0x19) [0xb73669a9]
(EE) 9: /lib/libdrm.so.2 (drmIoctl+0x40) [0xb758ebd0]
(EE) 10: /lib/libdrm.so.2 (drmCommandWrite+0x3f) [0xb759147f]
(EE) 11: /lib/libdrm_nouveau.so.2 (nouveau_bo_wait+0xa6) [0xb6d38146]
(EE) 12: /usr/lib/xorg/modules/drivers/nouveau_drv.so (_init+0x693a)
[0xb6d4df2a]
(EE) 13: /usr/lib/xorg/modules/drivers/nouveau_drv.so (_init+0x6f91)
[0xb6d4eb11]
(EE) 14: /usr/bin/X (DRI2SwapBuffers+0x36e) [0x81c48ce]
(EE) 15: /usr/bin/X (DRI2GetParam+0xcc4) [0x81c65e4]
(EE) 16: /usr/bin/X (SendErrorToClient+0x3dd) [0x807a87d]
(EE) 17: /usr/bin/X (_init+0x4659) [0x806c6d9]
(EE) 18: /lib/libc.so.6 (__libc_start_main+0xf3) [0xb7292963]
(EE) 19: /usr/bin/X (_start+0x21) [0x806887a]


As you can see it had crashed during nouveau_bo_wait+0xa6. Does it help to
understand what is going on here?

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