Bug 730598

Summary: [Arrandale] External monitor blank on resume from suspend
Product: [Fedora] Fedora Reporter: Ben Caradoc-Davies <ben>
Component: xorg-x11-drv-intelAssignee: Adam Jackson <ajax>
Status: CLOSED UPSTREAM QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 15CC: ajax, xgl-maint
Target Milestone: ---Keywords: Triaged
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard: [cat:lockup]
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-11-18 23:49:41 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
Xorg.0.log after resume and VT switch workaround
none
dmesg after resume and VT switch workaround
none
xrandr (same before and after resume+VT-switch) none

Description Ben Caradoc-Davies 2011-08-14 23:54:06 UTC 
Description of problem:

External monitor connected to a lap via HDMI remains blank when resuming from suspend. (Laptop screen is off.)

Version-Release number of selected component (if applicable):
kernel-2.6.40-4.fc15.x86_64
xorg-x11-drv-intel-2.15.0-5.fc15.x86_64
dbus-x11-1.4.6-5.fc15.x86_64

How reproducible:

Every time.

Steps to Reproduce:
1. Configure displays to have laptop monitor off and external monitor on.
2. Press power button to suspend.
3. Press power button to resume.
  
Actual results:

External monitor is on but blank. Laptop monitor is off.

Expected results:

External monitor is on displaying gnome-screensaver password prompt.

Additional info:

This is a regression. This bug did not occur in kernel-2.6.38.8-35.fc15.x86_64. Note that a dbus upgrade occurred at the same time.

The laptop is an Acer ultraportable with Intel i3 with Ironlake integrated graphics.

Workaround: Pressing Ctrl-Alt-F2 to select a virtual terminal wakes the monitor and displays the expected VT prompt. Pressing Alt-F1 to switch back to X causes the gnome-screensaver password prompt to be displayed as expected.
Comment 1 Ben Caradoc-Davies 2011-08-14 23:55:00 UTC 
Created attachment 518207 [details]
Xorg.0.log after resume and VT switch workaround
Comment 2 Ben Caradoc-Davies 2011-08-14 23:56:21 UTC 
Created attachment 518208 [details]
dmesg after resume and VT switch workaround
Comment 3 Ben Caradoc-Davies 2011-08-14 23:57:00 UTC 
Created attachment 518209 [details]
xrandr (same before and after resume+VT-switch)
Comment 4 Ben Caradoc-Davies 2011-08-15 00:03:03 UTC 
I also notice that it is possible to unlock the screen blind by typing the user password. The screen remains blank, and it is still necessary to use the VT switch trick (Ctrl-Alt-F2 then Alt-F1) to unblank the screen.
Comment 5 Ben Caradoc-Davies 2011-11-18 23:49:41 UTC 
Fixed in kernel-2.6.41.1-1.fc15.x86_64. Thanks!