<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Screen blanking (DP link reset?) when working in terminals" href="https://bugs.freedesktop.org/show_bug.cgi?id=97264#c2">Comment # 2</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Screen blanking (DP link reset?) when working in terminals" href="https://bugs.freedesktop.org/show_bug.cgi?id=97264">bug 97264</a> from <a class="email" href="mailto:cedric@maion.com" title="cedric@maion.com <cedric@maion.com>"> cedric@maion.com</a> <pre>Hi there, I'm having the exact same issue with a Dell XPS 13 (9343 // i7-5600U broadwell, 3200x1800 panel) laptop, directly attached to an external Dell P2715Q 4K (3840x2160 @60Hz) via DP. The 4K external screen is flickering when doing light activity -- easily reproduced indeed when using an X terminal. Steps to reproduce: - open side by side Firefox (or Chrome) + a terminal and/or a gvim window on the external 4K screen - do some light web browsing - give focus to the X terminal or gvim // at this point, display is still perfectly steady - press a key to enter a single character // as soon as the key is pressed, external screen goes black for a few seconds. Laptop screen is not affected. - Wait for the screen to come back, then continue typing // screen generally stays ON, but sometimes continues to flicker a few times in next minute. This happens almost every time I switch to the terminal window and start typing. OS specs: - Ubuntu 16.10 running Unity, modesetting Xorg driver - kernel 4.8.0. Issue is still present with 4.9.0rc1. Tried i915.enable_psr=0|2|3 and i915.enable_rc6=0, doesn't solve the issue. dmesg output shows the following message right after boot: [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun</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>