[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

--- Comment #2 from Richard Zowalla <zowalla at colorful-bytes.com> ---
(In reply to Lakshmi from comment #1)
> (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?

Thanks for the fast response!

I will report the requested information (dmesg w/ the boot options above) in
about 48 hours.

Regarding your other question:

Yes - any external monitor connected via HDMI-to-HDMI or HDMI-to-DVI is
unusable, i.e. results in a black screen. This behaviour is reproducable on
different external monitors.

The device also has a Mini DisplayPort connector. I will test a Mini
DisplayPort Cable and report this results asap.

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