Radeon 3650HD laptop LVDS lid open/closed detection problem

[Pasi Kärkkäinen]

On Sun, Sep 19, 2010 at 02:18:34PM +0300, Pasi Kärkkäinen wrote:
> On Tue, Jul 27, 2010 at 11:41:12AM +0300, Pasi Kärkkäinen wrote:
> > > >>
> > > >
> > > > Yes, the lid acpi stuff seems to work:
> > > >
> > > > lid closed:
> > > > $ cat /proc/acpi/button/lid/LID/state
> > > > state:      closed
> > > >
> > > > lid open:
> > > > $ cat /proc/acpi/button/lid/LID/state
> > > > state:      open
> > > >
> > > > I also verified that the initial lid state is "closed" when
> > > > the lid has been closed all the time during system startup
> > > > and only external DVI display is in use.
> > > >
> > > > (I modified /etc/rc5.d/S01sysstat to sleep+print+sleep
> > > > so I can check it during system startup before X starts).
> > > >
> > > > When the lid is closed xrandr says "LVDS connected", is that correct?
> > > 
> > > Yes.  The LVDS is connected, even if you don't necessarily want to use it.
> > > 
> > 
> > That's what I was thinking of. But good to get confirmation :)
> > 
> > > >
> > > > I think LVDS actually is ON when lid is closed, since I can immediately
> > > > see everything when I open the lid.. correct colors etc.
> > > >
> > > > So what's the component I should start looking at.. gnome-power-manager?
> > > > or something else?
> > > >
> > > > Actually.. I just noticed that already in GDM prompt the internal LVDS
> > > > gets enabled/turned on, even when the lid is closed.. I think.
> > > 
> > > Yes, it's up to to gdm, gnome-power-manager, etc. to decide the
> > > display policy based on the lid state.
> > > 
> > 
> > Ok. Is there a way to monitor the status of drm from /proc or /sys or from somewhere? 
> > 
> 
> Back to this..
> 
> so "/proc/acpi/button/lid/LID/state" seems to work properly on my laptop,
> but is there a way to monitor the state of the drm/kms outputs from /proc, /sys or from somewhere? 
> 
> I'd like to see the state before X is started, and verify what happens when GDM is started etc.. 
> (ie. if outputs are enabled/active or not).
> 

Ah, found it:

$ ls /sys/class/drm/card0
card0-DVI-D-1        card0-LVDS-1  dev     power      uevent
card0-HDMI Type A-1  card0-VGA-1   device  subsystem

$ cat /sys/class/drm/card0/card0-LVDS-1/status 
connected

$ cat /sys/class/drm/card0/card0-LVDS-1/enabled 
enabled

$ cat /sys/class/drm/card0/card0-LVDS-1/modes 
1680x1050
1400x1050
1280x1024
1440x900
1280x960
1280x854
1280x800
1280x720
1152x768
1024x768
800x600
848x480
720x480
640x480


-- Pasi