<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - Regression with Dell TB16 dock and Linux kernel 4.16.x" href="https://bugs.freedesktop.org/show_bug.cgi?id=106250#c6">Comment # 6</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - Regression with Dell TB16 dock and Linux kernel 4.16.x" href="https://bugs.freedesktop.org/show_bug.cgi?id=106250">bug 106250</a> from <a class="email" href="mailto:stanislav.lisovskiy@intel.com" title="Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>"> Stanislav Lisovskiy</a> <pre>I think, I could fix the mentioned above issues, at least on mine machine. The issue here actually consists of two issues: first one is something about Thunderbolt docking station initialization, it seems that it doesn't work properly if it is used as a separate module(periodically I had disconnecting mouse and keyboard, also dislpay). After I started using Thunderbolt as part of kernel it got significantly better. The second one, i.e black screen seems to be caused by wrong watermark calculations, after adding drm.debug I could see multiple error messages from skl_compute_wm function telling that "requested configuration exceeds maximum wm level". To check this hypothesis, I've implemented a small hack, so that if required res_blocks turns out to be >= than ddb_allocation that just assign. After those changes I don't get black screen anymore, even after multiple connecting/disconnecting Thunderbolts USB-C cable. However some USB peripherals might still stop working after that, which I believe is a USB hub related problem.</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> </ul> </body> </html>