<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [i915][BYT] Blank screen on MIPI panel" href="https://bugs.freedesktop.org/show_bug.cgi?id=101205#c8">Comment # 8</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [i915][BYT] Blank screen on MIPI panel" href="https://bugs.freedesktop.org/show_bug.cgi?id=101205">bug 101205</a> from <a class="email" href="mailto:dimitry@cos.flag.org" title="Innocent Bystander <dimitry@cos.flag.org>"> Innocent Bystander</a> <pre>(In reply to Innocent Bystander from <a href="show_bug.cgi?id=101205#c7">comment #7</a>) > Sprinkled a few more printks here and there. Discovered an interesting thing > in the function `find_section()` here: > > <a href="http://elixir.free-electrons.com/linux/v4.6/source/drivers/gpu/drm/i915/">http://elixir.free-electrons.com/linux/v4.6/source/drivers/gpu/drm/i915/</a> > intel_bios.c#L78 > > The faulty unit (X8S) reports section 53 (BDB_MIPI_SEQUENCE) at offset 4650 > with length of 7! Whereas the good unit (X8) reports the same offset, but > the length of 1355. All other sections are identical. > > Sounds like a firmware bug?... Actually not necessarily. It seems it's simply missing from the VBT. How does Windows figure out how to deal with the panel then? Is there a fallback sequences that can be used?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>