<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [ivb cpu edp] clock recovery fails with too many full/voltage retries, channel equalization succeeds" href="https://bugs.freedesktop.org/show_bug.cgi?id=70117#c31">Comment # 31</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [ivb cpu edp] clock recovery fails with too many full/voltage retries, channel equalization succeeds" href="https://bugs.freedesktop.org/show_bug.cgi?id=70117">bug 70117</a> from <a class="email" href="mailto:luke.hutch@gmail.com" title="Luke Hutchison <luke.hutch@gmail.com>"> Luke Hutchison</a> <pre>This is still happening on a Dell XPS 15 Touch (Intel HD Graphics 4600) with kernel 4.0.4-202.fc21.x86_64. Symptoms: if I switch off the external monitor with the DP cable plugged in, but the built-in laptop panel switched off, the laptop panel never switches on automatically, like it's supposed to (due to some sort of interaction between this bug and xrandr), so I can't see anything. When I switch the external monitor back on, the laptop tries to connect to the external monitor, but fails, so I can no longer see anything on either monitor. Switching to a VT with Ctrl+Alt+F2 shows the VT text on both displays just fine, but switching back to the X session shows only a black screen. It's about 3 seconds after I pull out and re-plug the DP cable that I see the following (and the power light on the monitor turns red, indicating an error state): [drm:intel_dp_start_link_train [i915]] *ERROR* too many voltage retries, give up trying "DISPLAY=:0 xrandr --output DP1 --off ; DISPLAY=:0 xrandr --output DP1 --auto" gives "xrandr: Configure crtc 0 failed" at the console, and the following lines also appear in /var/log/Xorg.0.log: [765559.448] (II) intel(0): resizing framebuffer to 2560x1600 [765559.456] (II) intel(0): resizing framebuffer to 8x8 The screen size is subsequently shown as 8x8 in xrandr: [root@localhost ~]# DISPLAY=:0 xrandr Screen 0: minimum 8 x 8, current 8 x 8, maximum 32767 x 32767 eDP1 connected (normal left inverted right x axis y axis) 3200x1800 59.98 + 2048x1536 60.00 1920x1440 60.00 1856x1392 60.01 1792x1344 60.01 1600x1200 60.00 1400x1050 59.98 1280x1024 60.02 1280x960 60.00 1024x768 60.00 800x600 60.32 56.25 640x480 59.94 DP1 connected (normal left inverted right x axis y axis) 2560x1600 59.97 + 1920x1200 59.95 1920x1080 59.99 1600x1200 60.00 1680x1050 59.95 1280x1024 60.02 1440x900 59.89 1280x720 59.97 1024x768 60.00 800x600 60.32 56.25 640x480 60.00 59.94 720x400 70.08 HDMI1 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) VGA1 disconnected (normal left inverted right x axis y axis) VIRTUAL1 disconnected (normal left inverted right x axis y axis) Nothing short of killing and restarting the X session (or rebooting) seems to fix the problem.</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>