[dp] External Screen doesn't wake up from sleep
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Incomplete
|
Low
|
Unassigned |
Bug Description
I have a Lenovo X1 Carbon with an external screen connected to a Mini DP to VGA adapter. External screen works fine until the display goes to sleep for inactivity (just the display goes to sleep, not the laptop).
When I return to the laptop, the built in screen wakes but the external screen does not. The screen is still detected, xrandr displays the resolution and I can move the cursor to the external display but the display remains off.
I have tried cycling with Fn+F7 and also tried Ctrl+Alt+F1 then Ctrl+Alt+F7. The only way to get the external display back on is by disconnecting the adapter from the laptops DP port and reconnecting.
dmesg produces:
drm:intel_
Running
Description: Ubuntu 13.04
Release: 13.04
kernel 3.8.0-23-generic
xserver-
Installed: 2:2.21.6-0ubuntu4
As a workaround I have disabled the monitor from sleeping in System Settings-
---
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/pcmC0D0p: omri 2408 F...m pulseaudio
DistroRelease: Ubuntu 13.10
HibernationDevice: RESUME=
InstallationDate: Installed on 2013-10-19 (80 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: LENOVO 3443CTO
MarkForUpload: True
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=
ProcVersionSign
RelatedPackageV
linux-
linux-
linux-firmware 1.116
Tags: saucy
Uname: Linux 3.11.0-15-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm bluetooth cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 04/29/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: G6ET96WW (2.56 )
dmi.board.
dmi.board.name: 3443CTO
dmi.board.vendor: LENOVO
dmi.board.version: Win8 Pro DPK TPG
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.name: 3443CTO
dmi.product.
dmi.sys.vendor: LENOVO
Changed in xserver-xorg-video-intel (Ubuntu): | |
status: | New → Confirmed |
summary: |
- External Screen doesn't wake up from sleep + [dp] External Screen doesn't wake up from sleep |
tags: | added: resume |
tags: | added: bios-outdated-2.61 needs-trusty-test needs-upstream-testing |
tags: |
added: bios-outdated-2.63 removed: bios-outdated-2.61 |
It is suspicious that it would only appear to fail whilst the monitor is off - that suggests we are missing a required wait for one of the control lines to power up.
Can you please 'echo 6 > /sys/modules/ drm/parameters/ debug' then xset dpms force off, wake it up (hopefully reproducing the issue) and then attach the output of dmesg?