[i915 BUG] Hard freeze on i5-5xxxU with kernel 4.9+

[i915 BUG] Hard freeze on i5-5xxxU with kernel 4.9+

[Lukas Erlacher]

Hello,

I don't know if this is a known bug, but it affects all kernels from 4.9
upwards (tested also with 4.11-rc1) and probably also 4.8 (there was one
report of someone using a 4.8 kernel).

The bug does not occur on 4.4.

It has been observed to affect Intel Core i5-5257U, i5-5200U and
i5-5300U CPUs, mainly on Dell Latitude E5450 Laptops.

Since it leads to a complete system freeze, I have not been able to get
any debug information out. If anyone has any advice how to get dmesg /
kernel panic information out, I'd be very happy to try.

I have tried setting i915.enable_psr=0 on the kernel bootline. That did
not help.

You can find some more information here:
https://bbs.archlinux.org/viewtopic.php?id=221252

Best,
Luke
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Re: [i915 BUG] Hard freeze on i5-5xxxU with kernel 4.9+

[Jani Nikula]

On Sat, 11 Mar 2017, Lukas Erlacher <erlacher@in.tum.de> wrote:
> I don't know if this is a known bug, but it affects all kernels from 4.9
> upwards (tested also with 4.11-rc1) and probably also 4.8 (there was one
> report of someone using a 4.8 kernel).

Please file a bug at [1].

Thanks,
Jani.

[1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel


-- 
Jani Nikula, Intel Open Source Technology Center
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Re: [i915 BUG] Hard freeze on i5-5xxxU with kernel 4.9+

[Chris Wilson]

On Mon, Mar 13, 2017 at 12:23:49PM +0200, Jani Nikula wrote:
> On Sat, 11 Mar 2017, Lukas Erlacher <erlacher@in.tum.de> wrote:
> > I don't know if this is a known bug, but it affects all kernels from 4.9
> > upwards (tested also with 4.11-rc1) and probably also 4.8 (there was one
> > report of someone using a 4.8 kernel).
> 
> Please file a bug at [1].

Fwiw, the opening bug description (sound playing in a loop) is a kernel
panic. Without obtaining the dmesg, usually via netconsole or perhaps
via pstore, there is very little we can do to help.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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