Radeon 3650HD laptop LVDS lid open/closed detection problem

[Alex Deucher]

On Mon, Jul 26, 2010 at 3:42 PM, Pasi Kärkkäinen <pasik at iki.fi> wrote:
> On Mon, Jul 12, 2010 at 01:37:28PM -0400, Alex Deucher wrote:
>> >> >>
>> >> >
>> >> > The other patch (0001-drm-radeon-kms-fix-shared-ddc-handling.patch) applied
>> >> > my system mostly works now, but here's a summary about the problem I still have
>> >> > with the lid detection:
>> >> >
>> >> > - I boot up the laptop with lid closed (LVDS inactive) so there's only external
>> >> > DVI display connected. Kernel boot messages show up on the external DVI display,
>> >> > and GDM login prompt appears on the external DVI display. All fine so far.
>> >> >
>> >> > - The actual problem: when X starts gnome panel etc show up on the internal LVDS
>> >> > display, which I can't see at all since the lid is closed! So those should go to the
>> >> > external DVI display only.. LVDS should be disconnected or inactive or something..
>> >> >
>> >> > Any pointers appreciated where to look at in the source.. I can do some debugging.
>> >>
>> >> Your desktop session manager should check the lid status when it loads
>> >> and attempt to do the right thing if there is an external monitor
>> >> detected.
>> >>
>> >
>> > Ok.
>> > So you think it's not a bug in the lid detection?
>>
>> Not sure.  That's handled by apci, not the video driver.  You can
>> check it the lid is producing proper events by running:
>> cat /proc/acpi/button/lid/LID/state
>> with the lid open and closed.  The desktop manager decides what the
>> policy is for the lid (blank display, suspend, turn off the connector,
>> etc.).  It should also take into account other connected outputs, but
>> I don't think it handles that too well at the moment.
>>
>
> 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.

>
> 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.

Alex