[Bug 111500] [CFL] Latitude 7400 2-in-1: intermittent screen freezes (i915)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111500

--- Comment #28 from Leho Kraav (:macmaN :lkraav) <leho at kraav.com> ---
(In reply to Lakshmi from comment #27)
> (In reply to Leho Kraav (:macmaN :lkraav) from comment #26)
> > I just got the same freeze on drm-tip (* d45d78ff950b - drm-tip:
> > 2019y-09m-08d-15h-18m-05s UTC integration manifest (21 hours ago) <Chris
> > Wilson>) by just moving the mouse around in a Firefox window.
> > 
> Thanks for the feedback from drmtip. Can you please attach the dmseg log
> from boot with debug parameters? 

Argh, that last short session I forgot to add drm.debug parameter.

But my latest drm-tip boot log attachment from yesterday
https://bugs.freedesktop.org/attachment.cgi?id=145300&action=edit should be
exactly the same, at least for the early phase?

Alternatively, if my current 4.19.71 session should freeze, I will re-do a
drm-tip session with drm.debug, and upon freeze, will be able to capture full
`journalctl -b` output for the whole session (it will be several hundred MB
uncompressed).

> What is the impact of this issue as a user? How do you recover this
> situation?

It's a complete deal-breaker, there is no recovery other than forced reboot via
power button (or Magic SysRq > REISUB). There seems to be no way to unfreeze
the screen. I haven't experienced this type of an difficult to solve graphics
stack issue on DELL laptop hardware for years.

I generally like this Latitude 7400 2-in-1 physical hardware quality, it's the
only reason I'm going through so much trouble trying to identify whether it's a
Linux software issue.

I ran all pre-BIOS hardware tests yesterday, also in Thorough mode, everything
passed w/ green checkmark - Memory, Processor, Video, etc.

Testing Win10 on this machine is prohibitively difficult workflow-wise, even
though it'd be the best way to eliminate "faulty hardware" vector.

I also have another contact in the wild, who has been running this Latitude
7400 2-in-1 hardware on Linux 4.19 branch, and while there have been other
problems, he confirmed not having experienced such screen freezes.

Ideally I'd test my setup with another identical laptop, but I have my doubts
if the DELL people are going to supply me with one without purchase.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20190909/2bb4e046/attachment-0001.html>