Re: t460s fedora 24 - display freeze

[Jonny Heggheim]

On 21 September 2016 at 13:38, Dusty Mabe  wrote:
> Are you in IRC? I may try to find you there and describe my system a
> little more.
No sorry, my schedule gives only time for async communication :(

Jonny
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Re: t460s fedora 24 - display freeze

[Dusty Mabe]

On 09/21/2016 09:05 AM, Dusty Mabe wrote:
> 
> 
> On 09/21/2016 08:41 AM, Dusty Mabe wrote:
>>
>>
>> On 09/20/2016 07:22 PM, Andrew Lutomirski wrote:
>>> On Sep 20, 2016 7:31 AM, "Dusty Mabe" >> > wrote:


 Several times over the past month my t460s has just blank screens
 when I come back to it after some time. I don't know if the thing
 froze up completely or if it is just the display not working. I lock
 my screens (laptop + 2 external monitors) and then leave for an hour
 or so. When I come back no attempt at input will get the lockscreen
 to appear. I have to power down and then back up.

 After boot I look at the journal and I always tend to see some of
 these:

 [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO 
 underrun
>>>
>>> Sadly, i915 has had issues on and off with Skylake.
>>
>> :( 
>>
>>>
 [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe C 
 (start=167156 end=167157) time 146 us, min 1073, max 1079, scanline start 
 1072, end 1082
>>>
>>> This smells like a bug that was fixed in the 4.8 series a bit late IIRC.  
>>> Search for i915 SAGV.
>>
>> Ok, I'll browse through the commit log.
>>
> 
> I think this commit is probably the one that you were referring to:
> 
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f403372
> 

This happened to me again today so I decided to grab the latest F25
kernel to see if that causes the problem to go away.

kernel-4.8.0-0.rc6.git0.1.fc25.x86_64
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Re: t460s fedora 24 - display freeze

[Dusty Mabe]

On 09/21/2016 08:41 AM, Dusty Mabe wrote:
> 
> 
> On 09/20/2016 07:22 PM, Andrew Lutomirski wrote:
>> On Sep 20, 2016 7:31 AM, "Dusty Mabe" > > wrote:
>>>
>>>
>>> Several times over the past month my t460s has just blank screens
>>> when I come back to it after some time. I don't know if the thing
>>> froze up completely or if it is just the display not working. I lock
>>> my screens (laptop + 2 external monitors) and then leave for an hour
>>> or so. When I come back no attempt at input will get the lockscreen
>>> to appear. I have to power down and then back up.
>>>
>>> After boot I look at the journal and I always tend to see some of
>>> these:
>>>
>>> [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO 
>>> underrun
>>
>> Sadly, i915 has had issues on and off with Skylake.
> 
> :( 
> 
>>
>>> [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe C 
>>> (start=167156 end=167157) time 146 us, min 1073, max 1079, scanline start 
>>> 1072, end 1082
>>
>> This smells like a bug that was fixed in the 4.8 series a bit late IIRC.  
>> Search for i915 SAGV.
> 
> Ok, I'll browse through the commit log.
> 

I think this commit is probably the one that you were referring to:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f403372
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Re: t460s fedora 24 - display freeze

[Dusty Mabe]

On 09/20/2016 07:22 PM, Andrew Lutomirski wrote:
> On Sep 20, 2016 7:31 AM, "Dusty Mabe"  > wrote:
>>
>>
>> Several times over the past month my t460s has just blank screens
>> when I come back to it after some time. I don't know if the thing
>> froze up completely or if it is just the display not working. I lock
>> my screens (laptop + 2 external monitors) and then leave for an hour
>> or so. When I come back no attempt at input will get the lockscreen
>> to appear. I have to power down and then back up.
>>
>> After boot I look at the journal and I always tend to see some of
>> these:
>>
>> [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO 
>> underrun
> 
> Sadly, i915 has had issues on and off with Skylake.

:( 

> 
>> [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe C 
>> (start=167156 end=167157) time 146 us, min 1073, max 1079, scanline start 
>> 1072, end 1082
> 
> This smells like a bug that was fixed in the 4.8 series a bit late IIRC.  
> Search for i915 SAGV.

Ok, I'll browse through the commit log.
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Re: t460s fedora 24 - display freeze

[Dusty Mabe]

On 09/20/2016 06:28 PM, Jonny Heggheim wrote:
> I have not run into this issue on my T460s, using the latest BIOS on
> Fedora 25. I can try to reproduce the error if you are able to give me
> a more detailed walk-through.
> 
> Jonny Heggheim

Thanks Jonny,

Are you in IRC? I may try to find you there and describe my system a
little more.

Dusty
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Re: t460s fedora 24 - display freeze

[Dusty Mabe]

On 09/20/2016 05:08 PM, Keith Keith wrote:
> 
> I ran in to a problem that involved an unresponsive screen a few months ago 
> and also had a FIFO underrun.  I think your problem is somewhere in the intel 
> graphics stack.  Here's the bug I had:
> https://bugzilla.redhat.com/show_bug.cgi?id=1339855
> https://bugs.freedesktop.org/show_bug.cgi?id=96284

Thanks

> 
> I was able to determine the system wasn't frozen because I made a unit file 
> that ran a bash script that saved a file on shut down and then pressed my 
> power button.  Systemd ran the script and I was able to see the file had been 
> updated.  The fact that it was able to shutdown without me forcing it was 
> also a good sign that this was the case.

Cool - I'll set up my system so I can determine if the bug is
freezing the entire system or just the display.

> 
> Some info about reporting these bugs is here:
> https://01.org/linuxgraphics/documentation/how-report-bugs
> 
> If you want to try some drivers that are close to the developer version 
> upstream you can try my copr repo:
> https://copr.fedorainfracloud.org/coprs/bollocks/intelblood/packages/
> 
> It hasn't been updated in a month.  I'm going to get on that today.  I try 
> for once a week but since I no longer have any bugs I don't run it on my 
> machine and so I forget easily. Note that running these is probably crazy 
> experimental and the package maintainer(me) is far from an expert. 

Thanks!
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Re: t460s fedora 24 - display freeze

[Andrew Lutomirski]

On Sep 20, 2016 7:31 AM, "Dusty Mabe"  wrote:
>
>
> Several times over the past month my t460s has just blank screens
> when I come back to it after some time. I don't know if the thing
> froze up completely or if it is just the display not working. I lock
> my screens (laptop + 2 external monitors) and then leave for an hour
> or so. When I come back no attempt at input will get the lockscreen
> to appear. I have to power down and then back up.
>
> After boot I look at the journal and I always tend to see some of
> these:
>
> [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun

Sadly, i915 has had issues on and off with Skylake.

> [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe
C (start=167156 end=167157) time 146 us, min 1073, max 1079, scanline start
1072, end 1082

This smells like a bug that was fixed in the 4.8 series a bit late IIRC.
Search for i915 SAGV.
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Re: t460s fedora 24 - display freeze

[Jonny Heggheim]

I have not run into this issue on my T460s, using the latest BIOS on
Fedora 25. I can try to reproduce the error if you are able to give me
a more detailed walk-through.

Jonny Heggheim
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Re: t460s fedora 24 - display freeze

[Keith Keith]

On Tue, Sep 20, 2016 at 12:30 PM, Dusty Mabe  wrote:

>
> Several times over the past month my t460s has just blank screens
> when I come back to it after some time. I don't know if the thing
> froze up completely or if it is just the display not working. I lock
> my screens (laptop + 2 external monitors) and then leave for an hour
> or so. When I come back no attempt at input will get the lockscreen
> to appear. I have to power down and then back up.
>
> After boot I look at the journal and I always tend to see some of
> these:
>
> [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
> underrun
> [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe C
> (start=167156 end=167157) time 146 us, min 1073, max 1079, scanline start
> 1072, end 1082
> [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A
> (start=488827 end=488828) time 107 us, min 1073, max 1079, scanline start
> 1072, end 1080
>
> I'm not saying these are what is causing the issue but are at least
> something I noticed.
>
> I'll continue to monitor this problem. It only happens like once every
> two weeks so it is hard to prepare for it by knowing the IP address so
> that I can try to ssh in to see if the system is frozen or if it is
> just the screen.
>
> Has anyone else seen some behavior like this? I am using i3wm and my
> system is updated approximately once a week, so I should have close to
> the latest software installed.
>
> Thanks,
> Dusty
>
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>

I ran in to a problem that involved an unresponsive screen a few months ago
and also had a FIFO underrun.  I think your problem is somewhere in the
intel graphics stack.  Here's the bug I had:
https://bugzilla.redhat.com/show_bug.cgi?id=1339855
https://bugs.freedesktop.org/show_bug.cgi?id=96284

I was able to determine the system wasn't frozen because I made a unit file
that ran a bash script that saved a file on shut down and then pressed my
power button.  Systemd ran the script and I was able to see the file had
been updated.  The fact that it was able to shutdown without me forcing it
was also a good sign that this was the case.

Some info about reporting these bugs is here:
https://01.org/linuxgraphics/documentation/how-report-bugs

If you want to try some drivers that are close to the developer version
upstream you can try my copr repo:
https://copr.fedorainfracloud.org/coprs/bollocks/intelblood/packages/

It hasn't been updated in a month.  I'm going to get on that today.  I try
for once a week but since I no longer have any bugs I don't run it on my
machine and so I forget easily. Note that running these is probably crazy
experimental and the package maintainer(me) is far from an expert.
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