[Bug 111495] Black Screen on Ubuntu 18.04 + Intel Graphics with Kernel > 4.15.0-47

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111495

Lakshmi <lakshminarayana.vudum at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Whiteboard|                            |Triaged
      i915 features|                            |display/HDMI
      i915 platform|                            |BSW/CHT
             Status|NEW                         |NEEDINFO

--- Comment #1 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Richard Zowalla from comment #0)
> Created attachment 145174 [details]
> dmesg output for v5.3-rc6 mainline kernel
> 
> Hi,
> 
> we've been running 18.04 (w/ Xubuntu) + 4.15.0-47 kernel for a while now (on
> Minix Z83-4 devices w/ Intel X5-Z8350 CPUs), which is working fine. I had
> opened an issue at Ubuntu, but was told to report this upstream (reference:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1840889)
> 
> After upgrading the kernel to a newer version (> 4.15.0-47), HDMI output is
> not available anymore, i915 reports an invalid EDID version via dmesg I
> dropped the full dmesg output on Pastebin: https://pastebin.com/jXTqAzkQ
> (with 4.15.0-58-generic). Attachment contains dmesg output of mainline
> kernel v5.3-rc6
> 
> As a start I'm blaming the Linux kernel / i915 since booting 4.15.0-47
> kernel works just fine.
> 
> Known faulty kernel versions are:
> 
> - Ubuntu Kernel: 4.15.0-58-generic
> - Ubuntu Kernel: 4.15.0-59-generic
> - Ubuntu Kernel: 5.0.0-25-generic
> - Mainline Kernel: v5.3-rc6
> 
> Not sure how to best collect logs and system information for you since I'm
> not used to debugging black screens. However, SSH access is possible. I am
> happy to provide more information, if needed. We can also install and test
> experimental kernel versions.
> 
> Note: This happens then attached via a standard HDMI cable as well as with a
> HDMI-DVI cable on different monitor setups.

Can you please attach the dmesg logs from boot with with kernel parameters
drm.debug=0x1e log_buf_len=4M? This will show more information about the issue.

Does it mean you can never use the external monitor with HDMI cable? Have you
tried to connect the external monitor with different type of cable? I mean is
this issue happening only HDMI?

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