[v3.7-rcx] drm/i915: *ERROR* Timed out waiting for forcewake old ack to clear

[v3.7-rcx] drm/i915: *ERROR* Timed out waiting for forcewake old ack to clear

[Jörg Otte]

At boot-up with newer kernels (at least v3.6.x, v3.7-rc) I always see
following on the bootup-display:

3.7-rcx: [drm:__gen6_gt_force_wake_mt_get] *ERROR* Timed out waiting
for forcewake old ack to clear.
3.6.x:    [drm:__gen6_gt_force_wake_mt_get] *ERROR* Force wake wait timed out

It's an Ivy Bridge/64Bit Notebook.

I know there is a patch at
http://www.mail-archive.com/intel-gfx@lists.freedesktop.org/msg14602.html
but it doesn't apply to v3.7-rcx.

This does not occur with the distro kernel (kubuntu, kernel 3.2.29).

Jörg.

Please  CC me, I am not subsribed

---
$ lspci
00:00.0 Host bridge: Intel Corporation Ivy Bridge DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge
Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation Panther Point USB xHCI Host
Controller (rev 04)
00:16.0 Communication controller: Intel Corporation Panther Point MEI
Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation Panther Point USB Enhanced
Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation Panther Point High Definition
Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation Panther Point PCI Express Root
Port 1 (rev c4)
00:1c.2 PCI bridge: Intel Corporation Panther Point PCI Express Root
Port 3 (rev c4)
00:1c.4 PCI bridge: Intel Corporation Panther Point PCI Express Root
Port 5 (rev c4)
00:1c.5 PCI bridge: Intel Corporation Panther Point PCI Express Root
Port 6 (rev c4)
00:1d.0 USB controller: Intel Corporation Panther Point USB Enhanced
Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation Panther Point 6 port SATA
Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation Panther Point SMBus Controller (rev 04)
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 07)
08:00.0 Network controller: Intel Corporation Centrino Wireless-N 2230 (rev c4)

$ lspci -vs 00:02.0
00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge
Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Fujitsu Limited. Device 16c2
        Flags: bus master, fast devsel, latency 0, IRQ 40
        Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 4000 [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

Re: [v3.7-rcx] drm/i915: *ERROR* Timed out waiting for forcewake old ack to clear

[Jörg Otte]

Thanks, the path works.

Jörg


2012/11/27 Chris Wilson <chris@chris-wilson.co.uk>:
> On Tue, 27 Nov 2012 17:29:36 +0100, Jörg Otte <jrg.otte@gmail.com> wrote:
>> At boot-up with newer kernels (at least v3.6.x, v3.7-rc) I always see
>> following on the bootup-display:
>>
>> 3.7-rcx: [drm:__gen6_gt_force_wake_mt_get] *ERROR* Timed out waiting
>> for forcewake old ack to clear.
>> 3.6.x:    [drm:__gen6_gt_force_wake_mt_get] *ERROR* Force wake wait timed out
>
> This is harmless error, just reporting a one-time conflict with the
> state leftover by the BIOS. The fix is queued for 3.8.
>
> commit 16995a9fe140802c026c2ce17bf7e232f86d57ab
> Author: Chris Wilson <chris@chris-wilson.co.uk>
> Date:   Thu Oct 18 11:46:10 2012 +0100
>
>     drm/i915: Clear FORCEWAKE when taking over from BIOS
> -Chris
>
> --
> Chris Wilson, Intel Open Source Technology Centre