KMS:RV635:Radeon 3650HD graphics driver broken on a laptop when connected to a docking station and external display

[Alex Deucher]

On Thu, Jun 3, 2010 at 7:56 AM, Pasi Kärkkäinen <pasik at iki.fi> wrote:
> On Wed, Jun 02, 2010 at 05:04:24PM -0400, Alex Deucher wrote:
>> On Wed, Jun 2, 2010 at 4:36 PM, Pasi Kärkkäinen <pasik at iki.fi> wrote:
>> > On Wed, Jun 02, 2010 at 11:15:44PM +0300, Pasi Kärkkäinen wrote:
>> >> On Wed, Jun 02, 2010 at 03:28:07PM -0400, Alex Deucher wrote:
>> >> > On Wed, Jun 2, 2010 at 3:12 PM, Pasi Kärkkäinen <pasik at iki.fi> wrote:
>> >> > > Hello,
>> >> > >
>> >> > > If someone wants to take a look at this bug I'd be glad:
>> >> > >
>> >> > > "KMS:RV635:Radeon 3650HD graphics driver broken on a laptop when connected to a docking station and external display":
>> >> > > https://bugzilla.redhat.com/show_bug.cgi?id=593429
>> >> > >
>> >> > > I'd like to help debugging it.. let me know what to try, if more information is needed..
>> >> > > I'm running Fedora 13.
>> >> > >
>> >> >
>> >> > Does it work if you boot up without the external monitor connected and
>> >> > then enable it after it's booted up?
>> >> >
>> >>
>> >> Ok I just tried this. I booted up the laptop without the dock,
>> >> and when I was in X using only the laptop internal display I connected
>> >> the laptop to the docking station (which has external display via DVI).
>> >>
>> >> Now I could go to Gnome Monitors application, see the external DVI display,
>> >> enable it and I got picture there!
>> >>
>> >> .. just once. After I disabled the external display, and tried re-enabling it,
>> >> it didn't work anymore.. no picture on the external display anymore.
>> >>
>> >> Also something weird:
>> >> http://pasik.reaktio.net/fedora/f13-radeon-monitors.jpg
>> >>
>> >> The external display is being shown twice.. for some reason?
>> >>
>> >> >  Also, is this specific to F13 or
>> >> > are you seeing similar issues with other kms kernels or distros?
>> >> >
>> >>
>> >> I'll try Ubuntu 10.04.
>> >>
>> >> I haven't tried custom/non-distro kernels.
>> >>
>> >
>> > I just tried with Ubuntu 10.04 (kernel 2.6.32) and it fails in a similar way than F13 (kernel 2.6.33) does.
>> >
>> > To summarize:
>> >        - Booting the laptop in the dock, both the internal laptop display and the external DVI display connected,
>> >          shows the beginning of the boot process on the internal display and then both displays go blank.
>> >
>> >        - Booting the laptop in the dock, internal display in use and the external display powered *off*,
>> >          shows the kernel boot process on the internal display but when GDM should show up the internal display goes blank.
>> >          Nothing on the external display either (if I power it on).
>> >
>> >        - Booting the laptop without the dock (and without the external display) works OK, I can see kernel boot process and GDM/X just OK.
>> >
>> >        - Booting the laptop without the dock, and attaching it to the dock after X is running allows me to use (=enable) the external display once.
>> >          But Gnome Monitor application shows the external display twice (as two devices)..
>> >
>>
>> Does it work if you boot with the laptop in the dock and then after it
>> boots attach the external monitor and enable it?  Do things work any
>> better if you use xrandr rather than the gnome displays tool?
>>
>
> I just shutdown the laptop, connected it to the dock,
> disconnected the DVI cable from the dock, and then powered on the laptop.
> Now the boot process was OK using the laptop internal display.. gdm and X
> showed up on the internal display OK.
>
> When I was in X I connected the DVI cable to the dock, and went to gnome
> Monitors application. Same thing - the external display is shown as
> two separate devices. Although they don't work - no matter which one
> of the external displays I choose I don't get picture on the external DVI display.
>
> I also tried with xrandr:
>
> $ xrandr
> Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 8192 x 8192
> VGA-0 disconnected (normal left inverted right x axis y axis)
> LVDS connected 1680x1050+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
>   1680x1050      60.0*+
>   1400x1050      60.0     60.0
>   1280x1024      59.9     60.0
>   1440x900       59.9
>   1280x960       60.0     59.9
>   1280x854       59.9
>   1280x800       59.8
>   1280x720       59.9
>   1152x768       59.8
>   1024x768       60.0     59.9
>   800x600        60.3     59.9     56.2
>   848x480        59.7
>   720x480        59.7
>   640x480        59.9     59.4
> DVI-0 connected (normal left inverted right x axis y axis)
>   1920x1080      59.9 +
>   1600x1200      60.0
>   1680x1050      60.0
>   1280x1024      60.0
>   1440x900       59.9
>   1280x960       60.0
>   1280x800       59.8
>   1024x768       60.0
>   800x600        60.3     56.2
>   640x480        60.0
> HDMI-0 connected (normal left inverted right x axis y axis)
>   1920x1080      59.9 +
>   1600x1200      60.0
>   1680x1050      60.0
>   1280x1024      60.0
>   1440x900       59.9
>   1280x960       60.0
>   1280x800       59.8
>   1024x768       60.0
>   800x600        60.3     56.2
>   640x480        60.0
>
> $ xrandr --output DVI-0 --right-of LVDS
>
> Didn't make a difference.. no picture on the external DVI display.
>
> I wonder if that HDMI-0 is the key to the problem.. I don't have anything connected
> to the HDMI connector on the laptop. There's no HDMI connector on the dock, it's only in the laptop.

Indeed that is the problem.  On your system the HDMI and DVI ports
share the same encoder and DDC line so they will both come up as
connected since the line is shared.  The driver used to check the edid
when the lines where shared and select HDMI or DVI based on the EDID,
but perhaps that got broken at some point.

Alex