Warnings/Errors during i915 suspend/resume on linux 3.0-rc5

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Hello,


I'm running latest kernel on my PC and when suspending the system,
there is a lot of warnings/errors from i915 driver ...

The following are indicated while suspending:

[drm:intel_cleanup_ring_buffer] *ERROR* failed to quiesce render ring
whilst cleaning up: -16

There was an enormous amount of such warnings in rc3/rc4, but with the
latest fixes the number is significantly reduced - some still
remaining though:

[10360.310580] WARNING: at drivers/gpu/drm/i915/i915_drv.c:322
gen6_gt_force_wake_get+0xec/0x100 [i915]()
[10360.310607]  [<ffffffff8105c5ef>] warn_slowpath_common+0x7f/0xc0
[10360.310609]  [<ffffffff8105c64a>] warn_slowpath_null+0x1a/0x20
[10360.310613]  [<ffffffffa023575c>] gen6_gt_force_wake_get+0xec/0x100 [i915]
[10360.310619]  [<ffffffffa024ee34>] i915_save_state+0x54/0x880 [i915]
[10360.310627]  [<ffffffffa01a5e17>] ? drm_irq_uninstall+0x197/0x1c0 [drm]
[10360.310631]  [<ffffffffa0235066>] i915_drm_freeze+0x66/0xc0 [i915]
[10360.310635]  [<ffffffffa02352b7>] i915_pm_suspend+0x47/0xa0 [i915]

[10360.310698] WARNING: at drivers/gpu/drm/i915/i915_drv.c:340
gen6_gt_force_wake_put+0x58/0x60 [i915]()
[10360.310716]  [<ffffffff8105c5ef>] warn_slowpath_common+0x7f/0xc0
[10360.310718]  [<ffffffff8105c64a>] warn_slowpath_null+0x1a/0x20
[10360.310722]  [<ffffffffa02357c8>] gen6_gt_force_wake_put+0x58/0x60 [i915]
[10360.310727]  [<ffffffffa024ee47>] i915_save_state+0x67/0x880 [i915]
[10360.310731]  [<ffffffffa01a5e17>] ? drm_irq_uninstall+0x197/0x1c0 [drm]
[10360.310735]  [<ffffffffa0235066>] i915_drm_freeze+0x66/0xc0 [i915]
[10360.310739]  [<ffffffffa02352b7>] i915_pm_suspend+0x47/0xa0 [i915]

[10360.311290] WARNING: at drivers/gpu/drm/i915/i915_drv.c:322
gen6_gt_force_wake_get+0xec/0x100 [i915]()
[10360.311307]  [<ffffffff8105c5ef>] warn_slowpath_common+0x7f/0xc0
[10360.311309]  [<ffffffff8105c64a>] warn_slowpath_null+0x1a/0x20
[10360.311313]  [<ffffffffa023575c>] gen6_gt_force_wake_get+0xec/0x100 [i915]
[10360.311318]  [<ffffffffa024f120>] i915_save_state+0x340/0x880 [i915]
[10360.311322]  [<ffffffffa01a5e17>] ? drm_irq_uninstall+0x197/0x1c0 [drm]
[10360.311326]  [<ffffffffa0235066>] i915_drm_freeze+0x66/0xc0 [i915]
[10360.311330]  [<ffffffffa02352b7>] i915_pm_suspend+0x47/0xa0 [i915]

[10360.311388] WARNING: at drivers/gpu/drm/i915/i915_drv.c:340
gen6_gt_force_wake_put+0x58/0x60 [i915]()
[10360.311405]  [<ffffffff8105c5ef>] warn_slowpath_common+0x7f/0xc0
[10360.311407]  [<ffffffff8105c64a>] warn_slowpath_null+0x1a/0x20
[10360.311411]  [<ffffffffa02357c8>] gen6_gt_force_wake_put+0x58/0x60 [i915]
[10360.311415]  [<ffffffffa024f133>] i915_save_state+0x353/0x880 [i915]
[10360.311419]  [<ffffffffa01a5e17>] ? drm_irq_uninstall+0x197/0x1c0 [drm]
[10360.311423]  [<ffffffffa0235066>] i915_drm_freeze+0x66/0xc0 [i915]
[10360.311427]  [<ffffffffa02352b7>] i915_pm_suspend+0x47/0xa0 [i915]

[10360.311456] WARNING: at drivers/gpu/drm/i915/i915_drv.c:322
gen6_gt_force_wake_get+0xec/0x100 [i915]()
[10360.311473]  [<ffffffff8105c5ef>] warn_slowpath_common+0x7f/0xc0
[10360.311475]  [<ffffffff8105c64a>] warn_slowpath_null+0x1a/0x20
[10360.311479]  [<ffffffffa023575c>] gen6_gt_force_wake_get+0xec/0x100 [i915]
[10360.311483]  [<ffffffffa024ef7b>] i915_save_state+0x19b/0x880 [i915]
[10360.311487]  [<ffffffffa01a5e17>] ? drm_irq_uninstall+0x197/0x1c0 [drm]
[10360.311491]  [<ffffffffa0235066>] i915_drm_freeze+0x66/0xc0 [i915]
[10360.311495]  [<ffffffffa02352b7>] i915_pm_suspend+0x47/0xa0 [i915]

[10360.311523] WARNING: at drivers/gpu/drm/i915/i915_drv.c:340
gen6_gt_force_wake_put+0x58/0x60 [i915]()
[10360.311540]  [<ffffffff8105c5ef>] warn_slowpath_common+0x7f/0xc0
[10360.311542]  [<ffffffff8105c64a>] warn_slowpath_null+0x1a/0x20
[10360.311546]  [<ffffffffa02357c8>] gen6_gt_force_wake_put+0x58/0x60 [i915]
[10360.311550]  [<ffffffffa024ef8e>] i915_save_state+0x1ae/0x880 [i915]
[10360.311554]  [<ffffffffa01a5e17>] ? drm_irq_uninstall+0x197/0x1c0 [drm]
[10360.311558]  [<ffffffffa0235066>] i915_drm_freeze+0x66/0xc0 [i915]
[10360.311562]  [<ffffffffa02352b7>] i915_pm_suspend+0x47/0xa0 [i915]

[10360.311589] WARNING: at drivers/gpu/drm/i915/i915_drv.c:322
gen6_gt_force_wake_get+0xec/0x100 [i915]()
[10360.311607]  [<ffffffff8105c5ef>] warn_slowpath_common+0x7f/0xc0
[10360.311608]  [<ffffffff8105c64a>] warn_slowpath_null+0x1a/0x20
[10360.311612]  [<ffffffffa023575c>] gen6_gt_force_wake_get+0xec/0x100 [i915]
[10360.311616]  [<ffffffffa024efb2>] i915_save_state+0x1d2/0x880 [i915]
[10360.311621]  [<ffffffffa01a5e17>] ? drm_irq_uninstall+0x197/0x1c0 [drm]
[10360.311624]  [<ffffffffa0235066>] i915_drm_freeze+0x66/0xc0 [i915]
[10360.311628]  [<ffffffffa02352b7>] i915_pm_suspend+0x47/0xa0 [i915]

[10360.311706] WARNING: at drivers/gpu/drm/i915/i915_drv.c:340
gen6_gt_force_wake_put+0x58/0x60 [i915]()
[10360.311723]  [<ffffffff8105c5ef>] warn_slowpath_common+0x7f/0xc0
[10360.311725]  [<ffffffff8105c64a>] warn_slowpath_null+0x1a/0x20
[10360.311729]  [<ffffffffa02357c8>] gen6_gt_force_wake_put+0x58/0x60 [i915]
[10360.311733]  [<ffffffffa024efc5>] i915_save_state+0x1e5/0x880 [i915]
[10360.311737]  [<ffffffffa01a5e17>] ? drm_irq_uninstall+0x197/0x1c0 [drm]
[10360.311741]  [<ffffffffa0235066>] i915_drm_freeze+0x66/0xc0 [i915]
[10360.311745]  [<ffffffffa02352b7>] i915_pm_suspend+0x47/0xa0 [i915]

and the following when resuming:

[drm:drm_mode_getfb] *ERROR* invalid framebuffer id

lspci -v shows the following for the details of the gpu:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation
Core Processor Family Integrated Graphics Controller (rev 09) (prog-if
00 [VGA controller])
	Subsystem: Acer Incorporated [ALI] Device 0491
	Flags: bus master, fast devsel, latency 0, IRQ 44
	Memory at fe000000 (64-bit, non-prefetchable) [size=4M]
	Memory at d0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at f000 [size=64]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 2
	Capabilities: [a4] PCI Advanced Features
	Kernel driver in use: i915
	Kernel modules: i915



Despite the error/warnings, i haven't observed any problems with the display

Please let me know if I can help in any way in debugging this ...

Marcin
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