Nouveau - Feb 2009 - [Bug 20361] New: nouveau - incorrect resolution on an external monitor attached to a laptop

http://bugs.freedesktop.org/show_bug.cgi?id=20361

           Summary: nouveau - incorrect resolution on an external monitor
                    attached to a laptop
           Product: xorg
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: ak at sensi.org
         QAContact: xorg-team at lists.x.org


Created an attachment (id=23375)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=23375)
X log

I'm using the nouveau driver and offb shipped with Fedora 10
(xorg-x11-drv-nouveau-0.0.11-1.20090106git133c1a5.fc10.ppc) on my Powerobook G4
12" (NV34M [GeForce FX Go5200]). When an external monitor is connected,
incorrect (lower) resolution is used with it (seems to be the same resolution
as the one of laptop's built-in LCD screen). X logs, dmesg output and X
config
attached.


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--- Comment #1 from Alex Kanavin <ak at sensi.org>  2009-02-27 11:06:09
PST ---
Created an attachment (id=23376)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=23376)
dmesg output


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--- Comment #2 from Alex Kanavin <ak at sensi.org>  2009-02-27 11:06:46
PST ---
Created an attachment (id=23377)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=23377)
X configuration


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Alex Kanavin <ak at sensi.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #23375|application/octet-stream    |text/plain
          mime type|                            |




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Alex Kanavin <ak at sensi.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #23376|application/octet-stream    |text/plain
          mime type|                            |




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Alex Kanavin <ak at sensi.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #23377|application/octet-stream    |text/plain
          mime type|                            |




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--- Comment #3 from Maarten Maathuis <madman2003 at gmail.com>  2009-02-27
11:11:22 PST ---
Is the monitor attached at X startup?


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--- Comment #4 from Alex Kanavin <ak at sensi.org>  2009-02-27 11:15:33
PST ---
Yes, it is. I'm not trying to hotplug anything yet.


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--- Comment #5 from Maarten Maathuis <madman2003 at gmail.com>  2009-02-27
11:19:59 PST ---
My guess is that the arbitrary choice is made that your lvds size is the
starting size. Which results in a framebuffer which cannot support larger
resolutions.

You'll have to add a virtual line (grep
http://www.thinkwiki.org/wiki/Xorg_RandR_1.2).


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--- Comment #6 from Alex Kanavin <ak at sensi.org>  2009-02-27 11:32:52
PST ---
Adding virtual did not help. I'll attach the new xorg.conf in case I did it
wrong.


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--- Comment #7 from Alex Kanavin <ak at sensi.org>  2009-02-27 11:33:27
PST ---
Created an attachment (id=23378)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=23378)
X configuration with virtual keyword


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--- Comment #8 from Maarten Maathuis <madman2003 at gmail.com>  2009-02-27
11:36:04 PST ---
Tried manually setting the desired resolution (if it isn't doing it
automatically in the first place it won't start magically doing something
else)?


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--- Comment #9 from Alex Kanavin <ak at sensi.org>  2009-02-27 11:51:52
PST ---
Yep, works great after
[ak at localhost SPECS]$ xrandr --output DVI-I-0 --mode 1920x1200

except I'm seeing slight pixel corruption, but that'd be a separate bug.

Anyway, this doesn't explain the non-sensible default choices - I'm no
xrandr
guru, but it's supposed to just work, no?


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--- Comment #10 from Maarten Maathuis <madman2003 at gmail.com> 
2009-02-27 11:54:37 PST ---
Default choices became better at some point, not sure if xserver 1.5.3 already
had them. Dynamic resizing of framebuffer will happen when we have a good
memory manager.


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--- Comment #11 from Stuart Bennett <sb476 at cam.ac.uk>  2009-02-28
06:09:52 PST ---
As Maarten says, this is an xserver feature.  See
http://cgit.freedesktop.org/xorg/xserver/tree/hw/xfree86/modes/xf86Crtc.c?h=server-1.5-branch
and search for "Using exact sizes for initial modes" as appears in
your log
just before it picks 1024x768 for both heads.

Looking at the xf86TargetPreferred function (in the same file) that selects
this behaviour, it tries to pick the largest preferred mode (an attribute
specified in the screen's EDID) where the mode is available on all screens,
hence you get 1024x768 as the laptop screen's preferred mode.  This
behaviour
appears mostly unchanged in master (
http://cgit.freedesktop.org/xorg/xserver/tree/hw/xfree86/modes/xf86Crtc.c ), so
if you want it fixed you'll have to file an xserver bug, but I suspect
they'd
argue it's reasonable and intended behaviour.

Alternatively, before using this method of mode selection, the xserver allows
consideration of user-specified preferences, so you could configure it in your
xorg.conf (see http://wiki.debian.org/XStrikeForce/HowToRandR12 for details). 
Also any DM you use may have a control panel to set this up for you when X
starts.


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--- Comment #12 from Alex Kanavin <ak at sensi.org>  2009-02-28 07:50:17
PST ---
I didn't mention this (thought it'd be obvious) but the notebook lid is
closed.
I think it's reasonable to detect this and not take the internal screen into
consideration at all, and just set the external screen to its native
resolution. Could it be that the driver somehow incorrectly assumes the
internal screen is visible/enabled?


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--- Comment #13 from Maarten Maathuis <madman2003 at gmail.com> 
2009-02-28 09:09:25 PST ---
As far as i'm aware we don't know when a lid is open or closed, so we
assume
it's always on.


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--- Comment #14 from Alex Kanavin <ak at sensi.org>  2009-02-28 09:29:07
PST ---
The lid status is very easy to find out though, for example from hal:

udi = '/org/freedesktop/Hal/devices/pmu_lid'
  button.has_state = true  (bool)
  button.state.value = true  (bool)
  button.type = 'lid'  (string)
  info.addons = {'hald-addon-pmu'} (string list)
  info.capabilities = {'button'} (string list)
  info.category = 'button'  (string)
  info.parent = '/org/freedesktop/Hal/devices/computer'  (string)
  info.product = 'Lid Switch'  (string)
  info.udi = '/org/freedesktop/Hal/devices/pmu_lid'  (string)
  linux.hotplug_type = 6  (0x6)  (int)
  linux.pmu_path = '/proc/pmu/info'  (string)
  linux.pmu_type = 2  (0x2)  (int)

Does X track the lid in any way?


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--- Comment #15 from Stuart Bennett <sb476 at cam.ac.uk>  2009-03-11
18:12:59 PST ---
(In reply to comment #14)
> Does X track the lid in any way?
I don't believe so.


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--- Comment #16 from Alex Kanavin <ak at sensi.org>  2009-03-12 04:58:03
PST ---
So seems like correctly supporting all scenarios is a distribution's job?

Nouveau is the default driver in upcoming Fedora, so I should probably file
this issue with them, if they haven't made the correct tweaks yet. 


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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #17 from Ilia Mirkin <imirkin at alum.mit.edu> ---
It appears that this bug report has laid dormant for quite a while. Sorry we
haven't gotten to it. Since we fix bugs all the time, chances are pretty
good
that your issue has been fixed with the latest software. Please give it a shot.
(Linux kernel 3.10.7, xf86-video-nouveau 1.0.9, mesa 9.1.6, or their git
versions.) If upgrading to the latest isn't an option for you, your
distro's
bugzilla is probably the right destination for your bug report.

In an effort to clean up our bug list, we're pre-emptively closing all bugs
that haven't seen updates since 2011. If the original issue remains, please
make sure to provide fresh info, see http://nouveau.freedesktop.org/wiki/Bugs/
for what we need to see, and re-open this one.

Thanks,

The Nouveau Team

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