<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [GLK DSI] Black screen after grub - Ubuntu 18.04 - kernel latest tip 21.11.2018" href="https://bugs.freedesktop.org/show_bug.cgi?id=108826#c151">Comment # 151</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [GLK DSI] Black screen after grub - Ubuntu 18.04 - kernel latest tip 21.11.2018" href="https://bugs.freedesktop.org/show_bug.cgi?id=108826">bug 108826</a> from <a class="email" href="mailto:stanislav.lisovskiy@intel.com" title="Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>"> Stanislav Lisovskiy</a> <pre>Hi, Sorry for a long reply. I'm currently on vacation. Yes it works on Windows, I checked with codebase to which I have access and DSI/VBT code looks pretty much same. However I'm still not able to compare with their GPIO and ACPI code. It looks like we are lacking initialization of something or may be GPIO mapping is not completely correct. However I checked with our pinctrl developer person and from his point of view everything looks correct. I have found that there are other controlable pins which affect DSI display, not mentioned in VBT or manual, which makes me believe there is something else we need to make it work. Unfortunately without exact pin description and initialization sequences any hardware is a "blackbox". That is why I asked for more detailed init description from panel vendor. I guess they should have it anyway for panel testing purposes. I will be back on 17th and start working on it immediately.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>