<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Black Screen on Ubuntu 18.04 + Intel Graphics with Kernel > 4.15.0-47" href="https://bugs.freedesktop.org/show_bug.cgi?id=111495#c2">Comment # 2</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Black Screen on Ubuntu 18.04 + Intel Graphics with Kernel > 4.15.0-47" href="https://bugs.freedesktop.org/show_bug.cgi?id=111495">bug 111495</a> from <a class="email" href="mailto:zowalla@colorful-bytes.com" title="Richard Zowalla <zowalla@colorful-bytes.com>"> Richard Zowalla</a> <pre>(In reply to Lakshmi from <a href="show_bug.cgi?id=111495#c1">comment #1</a>) > (In reply to Richard Zowalla from <a href="show_bug.cgi?id=111495#c0">comment #0</a>) > > Created <a href="attachment.cgi?id=145174" name="attach_145174" title="dmesg output for v5.3-rc6 mainline kernel">attachment 145174</a> <a href="attachment.cgi?id=145174&action=edit" title="dmesg output for v5.3-rc6 mainline kernel">[details]</a> > > 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: > > <a href="https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1840889">https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1840889</a>) > > > > 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: <a href="https://pastebin.com/jXTqAzkQ">https://pastebin.com/jXTqAzkQ</a> > > (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.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>