<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [BYT][VLV] No picture on DSI display after DRM loads on Teclast X80H tablet" href="https://bugs.freedesktop.org/show_bug.cgi?id=96996#c16">Comment # 16</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [BYT][VLV] No picture on DSI display after DRM loads on Teclast X80H tablet" href="https://bugs.freedesktop.org/show_bug.cgi?id=96996">bug 96996</a> from <a class="email" href="mailto:laszlo.fiat@gmail.com" title="Laszlo Fiat <laszlo.fiat@gmail.com>"> Laszlo Fiat</a> <pre>@Stephan Schorn Thank you for looking into this. CDCLK can be easily set in intel_display.c, in valleyview_calc_cdclk routine. I have tried to fix it to 333333 KHz, but it wasn't enough to get the DSI screen working. I think GMBUS is only related to HDMI/DP, and those are not connected, that is why the error in the dmesgs. I also tried to fix the dsi pll div to the correct value (18d) shown by the intel_reg with fastboot=1, but still no picture. What I try to do is to compile the "ancient" android-ia kernel for Baytrail/Cherryview, it is based on vanilla 3.14.64, plus a quilt (bunch of patches) from <a href="https://github.com/01org/ProductionKernelQuilts/blob/master/README.md">https://github.com/01org/ProductionKernelQuilts/blob/master/README.md</a> . This patchset contains everything that is needed to run android on Baytrail/Cherryview. It contains lots of code that never got mainlined (e.g. proper power management ic support). We also need the EFI_MIXED patchset that went into 3.15, because we want a 64 bit kernel that boots on our 32 bit EFI (<a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7cc3afdf43ffb703db831292f3816d909fd44767">http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7cc3afdf43ffb703db831292f3816d909fd44767</a> ). And also a nice .config file (enabling lots of options that the patches bring in). I want to try this kernel to see if it can initialize our display.</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>