Looks like PP_STATUS was reporting not ready when we attempted to turn on the panel, which implies that the programming was incomplete.

With anholt/drm-intel-next and my x201s undocking with LVDS/DP1 on/on, off/on, on/off seems to work fine and doesn't generate any warnings.

Can you either try a git clone of drm-intel-next, or a testing kernel when the current intel tree hits upstream?

Using drm-next as of today (76be97c1), copying the .config file from F13 and doing make oldconfig and leaving everything new as default. The screen gets messed up right after grub (and I have an encrypted root, so I need the screen to boot).

Btw, did you try with a dock? It works fine in every case I've tried except undocking.

Hmm, if you can test http://cgit.freedesktop.org/~ickle/drm-intel/log/?h=drm-intel-staging that would ideal. This x201s is quite happy either booting docked or undocked and attaching a DP monitor at will.

ppl,

This is really very interesting bug!

Spend few days to research this issue and found some ways to fix it.

My problem comes every time after external display used (tested with VGA1 output, not tested hdmi/dp).

After disconnecting external (or even with xrandr --off) the garbage coming to internal display!
Only mouse cursor is working and only one way to back internal picture is enable external display again and using both.

2.6.32.21-1 (old lts-kernel of archlinux) works fine without this problem.

2.6.35.4-1 (current) and 2.6.36-rc3 (even with 2.6.36-rc3-git1 snapshot) making the problem.

I found how to fix it with BIOS "CPU power management" = DISABLED but it adds 4-5 Watts of power usage (C-states disabled)...

Some magic: even when CPU power management is enabled just run "cat /dev/urandom >/dev/null" solves the problem!
So when CPU is loaded (even 1 core only) internal/external displays may be enabled/disabled without problems.

Finally if you need internal and external (via dockstation too) displays SEPARATELY there is better way I'm using now:

1) always start laptop without external display connected (just start it out of dock)

2) I'm using openbox so maybe you need to disable gnome/kde management of external displays (don't sure how)

3) add this line to /etc/acpi/handler.sh (calls lid-handler script every time when lid open/closed):

if [ "$1" == "button/lid" ]; then /etc/acpi/lid-handler; fi

4) make /etc/acpi/lid-handler shell script (maybe need to enable sleep and change LVDS1/VGA1, just run xrands to see details):

#!/bin/bash

export DISPLAY=:0.0

if grep -q closed /proc/acpi/button/lid/LID/state
then
# BAD (first need off then enable) xrandr --output LVDS1 --off --output VGA1 --auto
    xrandr --output LVDS1 --off
#   sleep 1
    xrandr --output VGA1 --auto
else
    xrandr --output VGA1 --off
#   sleep 1
    xrandr --output LVDS1 --auto
fi

today tested my /etc/acpi/lid-handler script with DisplayPort (DP1) output
it requires uncommented "sleep 1" delay between disconnect/connect
and works great

new issue with DP1 output...

seems docking must be always with open lid to prevent "blind" switching to DP1 before it's really connected

when docking with open lid, my script works ok and garbage-bug never happens (even without sleep in script)

today i'll try to improve script and post new results

Finally to fight this bug: more than one display must be never enabled at same time!

Workaround tested on thinkpad x201 with 2.6.35.4-1 (x86) with external vga and dockstation vga and displayport. Only one thing need to remember: you must start kernel and Xorg without external display.

Now I can flip internal/external display anytime and dock/undock laptop with open or closed lid anytime!

Seems all works beautiful but need more testings...

Changes:

1) catch lid and thinkpad dock/undock acpi events (small sleep need to identify external display before xrandr); add this lines to /etc/acpi/handler.sh:

if [ "$1" == "button/lid" ]; then /etc/acpi/lid-handler; fi
if [ "$1" == "ibm/hotkey" -a "$4" == "00006030" ]; then sleep 1; /etc/acpi/lid-handler; fi

2) /etc/acpi/lid-handler rewritten: now it auto detect names of internal/external display and fixed dock/undock with any case of lid open/closed

#!/bin/bash

export DISPLAY=:0.0

internal=`xrandr|grep -v disconnected|grep connected|grep LVDS|awk '{print $1}'`
external=`xrandr|grep -v disconnected|grep connected|grep -v LVDS|tail -1|awk '{print $1}'`

if grep -q closed /proc/acpi/button/lid/LID/state
then
    # lid is closed - take action only when external is connected - disable internal and enable external
    test -n "$external" && (xrandr --output $internal --off; xrandr --output $external --auto)
else
    # open: it is unknown which external was connected so disable all externals and enable internal
    xrandr|grep connected|grep -v LVDS|awk '{print $1}'|xargs -r -I@ -n1 xrandr --output @ --off
    xrandr --output $internal --auto
fi

The first bug resolved through the bound waits and fixing the underlying bugs.

The second issue though we haven't fixed, just disabled the self-refresh that was causing the failure. [bug 30126]

Seems to works with with whatever is in Fedora 14