<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [BSW]Long time test display, display exception, and got *ERROR* CPU pipe x FIFO underrun error." href="https://bugs.freedesktop.org/show_bug.cgi?id=97375#c12">Comment # 12</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [BSW]Long time test display, display exception, and got *ERROR* CPU pipe x FIFO underrun error." href="https://bugs.freedesktop.org/show_bug.cgi?id=97375">bug 97375</a> from <a class="email" href="mailto:gentoo@gishpuppy.com" title="M. G. <gentoo@gishpuppy.com>"> M. G.</a> <pre>Created <a href="attachment.cgi?id=132020" name="attach_132020" title="drm-tip dmesg with drm.debug=0xe">attachment 132020</a> <a href="attachment.cgi?id=132020&action=edit" title="drm-tip dmesg with drm.debug=0xe">[details]</a> drm-tip dmesg with drm.debug=0xe The bug is still present in drm-tip commit 028a0b3762b318a72ab04675355db97c854c230b (from 2017-05-25 - not 2017-05-22, sorry). Please see attached dmesg log. Please also note the kernel warning including the trace regarding a backlight issue. Or is this a subsequent error due to the underrun? Here is what I did when the bug was triggered: - I did a Suspend to RAM while no external monitor was connected - I connected an external monitor via HDMI (plus keyboard and mouse via USB) - I opened my laptop to resume from suspend. Output on internal LCD screen was OK and I executed a script in order to switch output from internal LCD to external screen. The script basically does: xrandr --output eDP1 --off xrandr --output HDMI1 --auto --left-of eDP1 --dpi 96x96 I got only a black screen on the external monitor (backlight on). To solve the problem I executed another script using a hotkey, which does: xrandr --output HDMI1 --off xrandr --output eDP1 --auto --primary --dpi 96x96 Then I executed my first script again and output on external monitor was OK.</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> <li>You are the assignee for the bug.</li> </ul> </body> </html>