[Bug 90951] HD4000: Display connected to displayport doesn't wake up when it's turn off and on or enters power saving mode

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=90951

--- Comment #8 from Thomas Mann <rauchwolke at gmx.net> ---
the last dmesg shows the error from the beginning.

The display works and is set to sleep with

sleep 1 ; xset dpms force standby

i think in line the problem begins, here the display should wake up.

[  615.886870] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[  615.889556] [drm:intel_dp_aux_ch] dp_aux_ch timeout status 0x7013003f
[  615.889563] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
[  615.892245] [drm:intel_dp_aux_ch] dp_aux_ch timeout status 0x7013003f
[  615.892252] [drm:intel_dp_complete_link_train] *ERROR* failed to start
channel equalization
[  615.894763] [drm:intel_dp_aux_ch] dp_aux_ch timeout status 0x7013003f
[  615.895282] [drm:ironlake_update_primary_plane] Writing base 0D480000
00000000 0 0 15872
[  615.895301] [drm:intel_update_fbc] more than one pipe active, disabling
compression
[  615.895400] [drm:intel_connector_check_state] [CONNECTOR:14:LVDS-1]
[  615.895414] [drm:intel_connector_check_state] [CONNECTOR:28:DP-1]

the rest of the output also includes

the commands:
         xrandr --output VGA1 \
                --off \
                --output DP1 \
                --off
         xrandr --output LVDS1 \
                --auto \
                --primary

        xrandr --dpi 96

        xrandr --output LVDS1 \
                --auto \
                --output  DP1 \
                --auto \
                --left-of LVDS1

which brings DP1 back o life

-- 
You are receiving this mail because:
You are on the CC list for the bug.
You are the assignee for the bug.