Re: [linux-pm] another software suspend issue, seems to be caused by i915/KMS

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On Sunday, August 01, 2010, Willi Mann wrote:
> Hi!
> 
> On my Thinkpad T500 with Debian-compiled kernel 2.6.35~rc6-1~experimental.1, 
> I still get OOpses on suspend. 

Did it happen with 2.6.34 or previous kernels?

> The following OOPS has been found be using the platform method. I had to 
> hard-reboot as SysRQ didn't work. (although I have also seen similar suspend 
> OOPSes where it worked). The suspend has been initiated by echo disk > 
> /sys/power/state from virtual terminal. 
> 
> http://wserver.wm1.at/~willi/linux/suspend_issue/suspend_error.jpg
> 
> However, I don't get the same OOPS every time, and the problem does not 
> occur at every suspend. I haven't managed to get more than one suspend 
> successfully finished (since a cold-boot). Particularly, it seems that if 
> the first suspend succeeds, the problem always occurs at the second attempt. 
> 
> Also note that if I initiated the suspend from X, I often got a blank screen 
> (except for a blinking cursor) instead of the OOPS. (The fact that the 
> screen was blank could also be related to the fact that when tested from X, 
> I hadn't raised the log levels)
> 
> When I disable the i915 module (I renamed it), I can't reproduce the 
> problem.
> 
> lspci -v -s 00:02.0:
> 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset 
> Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
>         Subsystem: Lenovo Device 2114
>         Flags: bus master, fast devsel, latency 0, IRQ 48
>         Memory at f4400000 (64-bit, non-prefetchable) [size=4M]
>         Memory at d0000000 (64-bit, prefetchable) [size=256M]
>         I/O ports at 1800 [size=8]
>         Expansion ROM at <unassigned> [disabled]
>         Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
>         Capabilities: [d0] Power Management version 3
>         Kernel driver in use: i915
> 
> Please let me know what additional infos are required to resolve this 
> problem. 

Rafael
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