sometimes sighup needed for gnome-shell

[Gianluca Cecchi]

Hello,
this question is mainly related to F16, but perhaps relevant for
current rawhide too.
Eventually I'm going to test this problem with rawhide too...
I didn't have these problems with rc2/rc3 or first final F16 kernel...

On my system with corei7 and sandybridge I'm noticing problems in
gnome-shell with latest kernel (after the 16 release one).
Donna if related to kernel itself and/or the recently updated libdrm.

Sometimes (latest days at least one time a day), the gnome session
goes unusable: I'm able to move mouse, but when selecting a menu item
it is greyed but no drop down of its options appears, no alt-tab or
alt-f2 possibility....
Only way to come back to usable state is going into a console window
(Ctrl+Alt-F2), searching for gnome-shell process id and run

kill -SIGHUP <pid>

Then come back to X windows system session that has become usable
again (Ctrl+Alt+F2 and come back to X doesn't give any result if I
don't kill sighup gnome-shell)

I think I began to have this behaviour after kernel-3.1.1-1.fc16.x86_64

btw: I'm using this option at boot (but I was using it with 3.1.0 kernel too)
i915.i915_enable_rc6=1

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation
Core Processor Family Integrated Graphics Controller (rev 09) (prog-if
00 [VGA controller])
        Subsystem: ASUSTeK Computer Inc. Device 1682
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 48
        Region 0: Memory at dc400000 (64-bit, non-prefetchable) [size=4M]
        Region 2: Memory at b0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at e000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915

Any way to debug this?
Only rows I find in Xorg.0.log are:
[ 10911.891] (II) intel(0): Printing DDC gathered Modelines:
[ 10911.891] (II) intel(0): Modeline "1366x768"x0.0   69.30  1366 1425
1464 1472  768 773 782 785 -hsync -vsync (47.1 kHz)
[ 16044.192] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 16079.534] (II) AIGLX: Resuming AIGLX clients after VT switch
[ 16079.870] (II) intel(0): EDID vendor "COR", prod id 6104
[ 16079.870] (II) intel(0): Printing DDC gathered Modelines:
[ 16079.870] (II) intel(0): Modeline "1366x768"x0.0   69.30  1366 1425
1464 1472  768 773 782 785 -hsync -vsync (47.1 kHz)
[ 16079.973] (**) Option "Device" "/dev/input/event4"
[ 16079.973] (--) synaptics: SynPS/2 Synaptics TouchPad: touchpad found
[ 16088.180] (II) AIGLX: Suspending AIGLX clients for VT switch <----
when I ctrl+Alt+F2
[ 16116.682] (II) AIGLX: Resuming AIGLX clients after VT switch <---
when I come back to X


In messages:
Nov 18 13:28:08 ope46 kernel: [15397.459003] CIFS VFS: Received no
data, expecting 4
Nov 18 13:29:08 ope46 kernel: [15457.454946] CIFS VFS: Received no
data, expecting 4
Nov 18 13:30:08 ope46 kernel: [15517.450810] CIFS VFS: Received no
data, expecting 4
Nov 18 13:40:40 ope46 gnome-session[5954]: WARNING: Application
'gnome-shell.desktop' killed by signal <--- when I run the kill
-SIGHUP command
Nov 18 13:56:09 ope46 kernel: [17077.935596] CIFS VFS: Received no
data, expecting 4
Nov 18 13:57:08 ope46 kernel: [17137.338785] CIFS VFS: Received no
data, expecting 4

What would be the best package to bugzilla against...?
Thanks in advance

Gianluca