<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#c138">Comment # 138</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>(In reply to Microtech from <a href="show_bug.cgi?id=108826#c134">comment #134</a>) > Created <a href="attachment.cgi?id=144392" name="attach_144392" title="DSN">attachment 144392</a> <a href="attachment.cgi?id=144392&action=edit" title="DSN">[details]</a> > DSN > > (In reply to Stanislav Lisovskiy from <a href="show_bug.cgi?id=108826#c132">comment #132</a>) > > Miroslaw, do you happen to have any other documents for Microtech Etab? > > Would be nice to see the actual schematics.. > > Hi Stanislav, in attached you can find all the docs showing connections > between PCBA and all the rest. I hope you can find a solution quickly, > because this is the last issue we have to solve before to make available the > Linux systems on the e-tab Pro. > Please let us know. I checked the schematics - pins look correct(i.e GPIO 135 is reset, GPIO 144 power and GPIO 145 is backlight). I guess we might be missing something in vbt and/or during port initilization stage. Do you have any documents containing more precise panel initialization sequence? I mean exact sequence of command which is expected by this panel, for example exact DCS commands need to be sent for example. The pdf attached by Miroslaw has power-on, power-off sequence which matches what we doing already, however there is no dcs command description. I also checked Windows driver - MIPI DSI initilization looks roughly the same, however as I'm not familiar with that codebase which is quite big, it might take a lot of time to figure out some minor differences. I would say the best way to go would be to get exact example initilization sequence from panel vendor and then compare everything what we send to that.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>