[i945] Samsung SyncMaster 2243BW wrongly configured

[Martin]

My external monitor is not correctly detected (low res, picture out of screen). I somewhere read it could be the cable, but I have a full 15pin VGA-cable attached to it. It did not work on 8.10 either. Is this a thing with the combination of graphics card monitor, or is it only details in som hardware database that is missing. It seems that a lot of people are having trouble especially with Samsunc monitors...

[Martin Olsson (mnemo)]

Hi Martin :)

Each monitor typically carries EDID data that describes the monitors dimensions, resolution capabilities etc. When you connect a monitor to a computer the X server will typically query the monitor for this information. However, some monitors actually return the wrong data and in that case it's necessary to hardcode a quirk for that model/make in the X server. I don't know if you actually have an EDID issue though.

FWIW, I have a samsung syncmaster 2253bw (not exactly the same but close) and it works perfectly with ubuntu straight out of the box when used as the primary monitor for my desktop box at least.

Anyway, as a first step can you please run this command to provide more information about your hw/sw config:
apport-collect 367824

[Martin (martin-wetterstedt)]

Architecture: i386
DistroRelease: Ubuntu 9.04
Package: xorg 1:7.4~5ubuntu18
PackageArchitecture: i386
ProcEnviron:
 SHELL=/bin/bash
 LANG=sv_SE.UTF-8
ProcVersion: Linux version 2.6.28-11-generic (buildd@palmer) (gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009
Uname: Linux 2.6.28-11-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Martin (martin-wetterstedt)]

Apport collect crashed during upload, showing:

get fences failed: -1
param: 6, val: 0
Uploading additional information to Launchpad bug...
   short text data...
   attachment: Dependencies.txt...
   attachment: LsHal.gz...
Traceback (most recent call last):
  File "/usr/bin/apport-collect", line 173, in <module>
    upload(report, bug)
  File "/usr/bin/apport-collect", line 97, in upload
    filename=part.get_filename(), is_patch=False)
  File "/usr/lib/python2.6/dist-packages/launchpadlib/resource.py", line 337, in __call__
    args[key] = simplejson.dumps(value, cls=DatetimeJSONEncoder)
  File "/var/lib/python-support/python2.6/simplejson/__init__.py", line 243, in dumps
    **kw).encode(obj)
  File "/var/lib/python-support/python2.6/simplejson/encoder.py", line 360, in encode
    return encode_basestring_ascii(o)
UnicodeDecodeError: 'utf8' codec can't decode byte 0x8b in position 1: unexpected code byte

[Martin (martin-wetterstedt)]

I had the screens configured as mirrored (default), but when I unchecked that I got me external screen to work. But it is detected as 21", and not rotatable which it is. I also note that graphics is really slow, just scrolling up and down in firefox show some real delays.

[Martin Olsson (mnemo)]

I've reported the apport-collect crash to the apport developer. Bug report is here:
https://bugs.launchpad.net/ubuntu/+source/apport/+bug/368004

It would be useful if you could manually attach /var/log/Xorg.0.log and the output of "dmesg", "glxinfo" and "xrandr --verbose" please.

[Martin (martin-wetterstedt)]

The slow graphics seems to come from this, which also increased graphics performance significantly: https://wiki.ubuntu.com/X/Troubleshooting/IntelPerformance#Problem:%20%20UXA%20gives%20better%20performance%20than%20EXA%20-%20why%20not%20move%20to%20UXA?

[Bryce Harrington (bryce)]

[This is an automatic notification.]

A new major version of the -intel driver is now available in Karmic.

This version includes a major reworking of the acceleration
architecture, which resolves a huge number of issues. We do not know
whether it resolves the issue you reported.

Would you mind testing Karmic Alpha-2 and seeing if it is still a
problem? CD ISO images are available here:

  http://cdimages.ubuntu.com/releases/karmic/

If the issue can still be reproduced on karmic, please report here with
your findings, and attach a fresh Xorg.0.log from your test, and we will
be able to forward the bug upstream.

Otherwise, if the bug no longer exists in Karmic, let us know that as
well.

In the off chance you encounter different bugs while attempting to test
Karmic, please report those as new bug reports.

[Martin (martin-wetterstedt)]

Exactly the same in Karmic, is, wrongly, detected as 21" screen with maximum resolution 1024x768.

[Bryce Harrington (bryce)]

Thanks for testing

[Bryce Harrington (bryce)]

The problem is not that your monitor is incorrectly detected or that something is wrong with the EDID. From the logs it clearly sees the proper resolutions for both your laptop display and your monitor.

The issue is that X is trying to select a resolution in common between both your laptop and your external monitor, but the highest resolution they have in common is 1024x768. If you disable your LVDS, then your external monitor should work properly.

If I've misunderstood your bug report, feel free to reopen but provide more specific details so it's easier to understand what you're trying to do, perhaps with a photo of the screens if that would help explain the problem.

[talnevo (talnevo)]

Architecture: amd64
DistroRelease: Ubuntu 9.04
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 LANGUAGE=en_US:en
Uname: Linux 2.6.28-18-generic x86_64
UserGroups: kvm libvirtd vboxusers