[Bug 107543] Video cutout on Kaby Lake U processors.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107543

--- Comment #62 from Anshuman Gupta <anshuman.gupta at intel.com> ---
(In reply to Jan from comment #61)
Hi Jan,
Please find my inline response.

> Last two days I performed various tests to get a better understanding of the
> root-cause. First I kept the machine switched on a full night with the
> settings i915.modeset=1, nouveau.modeset=0. Dmesg showed no failed hardware.
> In the morning the machine had crashed, ssh-server down. I can't see any
> errors in dmesg.
This is strange, this particular bug is about Watermark configuration with 4k
high-resolution display (we have a workaround patch also for that
https://bugs.freedesktop.org/attachment.cgi?id=141958&action=edit ). 
ssh server was working while this issue observed. Could you please get us the
log, in order to check if it is a similar bug.  
> 
> I subsequently repeated with recovery mode. First booting until the login
> screen: crashed. Then by booting to the recovery console: crash. 
> 
> After every test I reboot by pressing the power-key. The tests show that the
> machine crashes within a few minutes when keeping the machine on for a long
> time.
> 
> I also tested by keeping the machine in the GRUB menu. The machine has not
> crashed then. The machine also does nog crash by using Windows 10. Kept the
> machine on for a full day.
> 
> In my opinion the above rules out any hardware malfunction. The issue occurs
> by loading the linux in the current configuration.
Can you please test with the recently merged patch-series to drm-tip
https://patchwork.freedesktop.org/series/51878/  
> 
> Since my machine also has a nvidia 940mx card on board, I am now planning to
> install the nvidia driver from the nvidia site :
> 'NVIDIA-Linux-x86_64-340.96.run'. Wonder what's gonna happen then.
> 
> I am also planning to see if I can enhance debugging to see if I can get any
> logging on the error.
You enhance log message by below command,
echo 0xe > /sys/module/drm/parameter/debug 

> 
> 
> ps: with all due respect, I am somewhat annoyed that there isn't any
> response on my previous posts. Currently, I am typing in the void, while many
> messages on this topic have been posted in this thread. At least replying
> would be nice :-)

Thanks,
Anshuman Gupta.

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