[Bug 109078] Warning PID: 1150 at drivers/gpu/drm/i915/intel_cdclk.c:835

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109078

--- Comment #15 from Valerio Vanni <valerio.vanni at inwind.it> ---
>Valerio, I couldn't find the motherboard you describe.  Do you mean the B360M-A?
>
>  https://www.newegg.com/Product/Product.aspx?Item=N82E16813119086

Yes, I typed it wrong.


>Things that I would try:
>
> - eliminate hardware as a root cause
>   - check for bios update

BIOS is 1602, updated at Novembre. Now I see that there's an updated version,
I'll try immediately.

>   - verify that RAM passes memcheck

I'll try this too. After I built the machine, I did and it was ok.

>What is it about the error message that causes you to think this is a graphics >bug?  The stack trace makes me think there is something wrong with power >management.

I suspected it from the first line
WARNING: CPU: 1 PID: 1150 at drivers/gpu/drm/i915/intel_cdclk.c:835
skl_get_cdclk+0x211/0x250 [i915]

Where in stack trace do you find power management issue?
I'm not very good at analyize stack trace, as I said i focused on the first
lines.


>The symptoms (won't wake up) seem to be similar too, although from >your >description, it doesn't sound like the machine is asleep.

But perhaps they are not related.

Sometimes (but even less frequently) the machine starts up (power led on) but
with blank screen, no response to ping etc.
I'm not able to say if it stops at BIOS or during linux boot because it usually
happens when I'm on another machine with a kvm switch. I'm on another machine,
I power on this, after some time I point the kvm switch on this machine and I
find it dead.

I have to fix my serial port bracket, because it has a wrong pinout for thism
MB. Perhaps with serial console I can see something on serial port, if Linux
boot has at least started.

When I see this warning, instead, the machine is alive and (seems to be)
working.

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