[Bug 20142] New: enabling underscan by default behaves badly with so many monitors.

[Bug 20142] New: enabling underscan by default behaves badly with so many monitors.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=20142

           Summary: enabling underscan by default behaves badly with so
                    many monitors.
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.36-rc6
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: lultimouomo@gmail.com
        Regression: No


commit 039ed2d9a24b3c4e272439b1551762fcb77c188a enables underscan if the mode
is a typical TV one. But almost every widescreen monitor in the 22"-24" range
uses 1080p, and most of them support HDMI. It seems really strange to me that
the most common case of a 1080p display is a TV, so the commit should be
reverted or limited to non-1080p modes.

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[Bug 20142] enabling underscan by default behaves badly with so many monitors.

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https://bugzilla.kernel.org/show_bug.cgi?id=20142


Rafał Miłecki <zajec5@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |zajec5@gmail.com




--- Comment #1 from Rafał Miłecki <zajec5@gmail.com>  2010-10-12 10:48:07 ---
I totally agree after testing that newer kernels with SONY BRAVIA 52'' 1080p
(firmware: 2.14.581). Driver enables underscan when using "auto" on this TV.

1) In default mode "Wide" I get black borders
2) In "Zoom max." I get black border on bottom and top, left, right are cut
3) In "14:9" left and right black border, top and bottom cut
4) In "Smart" overzoomed (all sides cut)
5) In "4:3" huge black border and scaled without proportions

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[Bug 20142] enabling underscan by default behaves badly with so many monitors.

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https://bugzilla.kernel.org/show_bug.cgi?id=20142


Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com




--- Comment #2 from Alex Deucher <alexdeucher@gmail.com>  2010-10-12 15:10:14 ---
Unfortunately, there's no way for the driver to know whether the TV has
overscan enabled or not or if the TV is in some special scaling mode enabled. 
Lots of TV's have no option to disable overscan.  As such, the driver
underscans the image to compensate for the overscan; this is limited to the
common HD modes.  Unfortunately, there's no good answer.  Before I added
underscan support to the driver, I got bug reports from people with TV's where
the image was cut off on the edges due to the TV overscanning.  You can disable
underscan in the driver with:
xrandr --output <output> --set underscan off

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[Bug 20142] enabling underscan by default behaves badly with so many monitors.

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https://bugzilla.kernel.org/show_bug.cgi?id=20142





--- Comment #3 from Luca Niccoli <lultimouomo@gmail.com>  2010-10-13 00:05:10 ---
I know, but my point is that there are too many displays that use 1080p to
choose underscan by default.
Also, TVs that show the "HD Ready 1080p" logo are required to support a mode
that doesn't overscan ([0], p. 13).
Besides, if I understand it correctly, underscanning is really just a
workaround that produces blurred images.
Underscan support is fine, but I don't think it should be enabled by default
with such a (necessarily) approximative euristic.

[0]
http://www.digitaleurope.org/fileadmin/user_upload/document/HD_ready_1080p_1188470475.pdf

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[Bug 20142] enabling underscan by default behaves badly with so many monitors.

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https://bugzilla.kernel.org/show_bug.cgi?id=20142





--- Comment #4 from Alex Deucher <alexdeucher@gmail.com>  2010-10-13 00:39:49 ---
(In reply to comment #3)
> I know, but my point is that there are too many displays that use 1080p to
> choose underscan by default.

There are a lot of 1080P TVs too and most of them overscan by default.  In
fact, I would say the vast majority of new TVs are 1080p.  Probably more TVs
than monitors.

> Also, TVs that show the "HD Ready 1080p" logo are required to support a mode
> that doesn't overscan ([0], p. 13).

In practice that doesn't seem to be the case.  There seem to be quite a few
vendors that do not provide a non-overscanned mode or they hide the mechanism
to disable it well enough that most users can't find it.  Either way, overscan
is always the default on TVs.

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[Bug 20142] enabling underscan by default behaves badly with so many monitors.

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https://bugzilla.kernel.org/show_bug.cgi?id=20142





--- Comment #5 from Luca Niccoli <lultimouomo@gmail.com>  2010-10-13 08:45:36 ---
I tried a really tentative benchmarc looking for "LCD monitor" and "LCD monitor
1080 HDMI" among computer monitors on google products. 1080p HDMI monitors are
10000 out of 95000, more than any other resolution but 1280x1024 (13000,
regardless of connection type)
I think this will do more harm than good, but I see how this is a judgement
call.

Still, wouldn't it be better to have a way disable it via a proper setting
(xorg.conf) instead of using Xsession?
Also, a way to disable underscanning even if X isn't running could be nice
(though I guess someone using text only on a HDMI screen isn't really a common
use case)

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[Bug 20142] enabling underscan by default behaves badly with so many monitors.

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https://bugzilla.kernel.org/show_bug.cgi?id=20142





--- Comment #6 from Alex Deucher <alexdeucher@gmail.com>  2010-10-13 15:18:51 ---
It sucks for everyone ;)  It would be nice if there was an EDID flag for
overscan.

I would be a good idea to expose connector properties via xorg.conf and
additionally via sysfs, but it's a fair amount of work and I haven't had time
to work on it unfortunately.

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[Bug 20142] enabling underscan by default behaves badly with so many monitors.

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https://bugzilla.kernel.org/show_bug.cgi?id=20142


John <john.ettedgui@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |john.ettedgui@gmail.com




--- Comment #7 from John <john.ettedgui@gmail.com>  2010-10-27 04:00:08 ---
Hmmm, even with what seems to be overscan (hdsize) on my tv, the image would
not fit properly (but better than without it) and still be blury, whereas using
the xrandr command you gave everything went back to normal.

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[Bug 20142] enabling underscan by default behaves badly with so many monitors.

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https://bugzilla.kernel.org/show_bug.cgi?id=20142


Jeff Layton <jlayton@redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jlayton@redhat.com




--- Comment #8 from Jeff Layton <jlayton@redhat.com>  2010-11-03 18:40:57 ---
Just got a new radeon card today and got bitten by this. The display is
connected via DVI too, so the new underscan default is not limited to HDMI.

Would it be feasible to add a module parameter that could be used to disable
the default underscan? That way you could at least get a sane resolution before
X is started...

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[Bug 20142] enabling underscan by default behaves badly with so many monitors.

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https://bugzilla.kernel.org/show_bug.cgi?id=20142





--- Comment #9 from Rafał Miłecki <zajec5@gmail.com>  2011-01-10 11:59:03 ---
[PATCH] drm/radeon/kms: disable underscan by default

http://www.mail-archive.com/dri-devel@lists.freedesktop.org/msg06695.html
http://permalink.gmane.org/gmane.comp.video.dri.devel/53051

This is in drm-next already:
http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=commitdiff;h=56bec7c009872ef33fe452ea75fecba481351b44

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[Bug 20142] enabling underscan by default behaves badly with so many monitors.

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Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |alan@lxorguk.ukuu.org.uk
         Resolution|                            |CODE_FIX




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[Bug 20142] enabling underscan by default behaves badly with so many monitors.

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Alan <alan@lxorguk.ukuu.org.uk> changed:

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                 CC|                            |contact+kernel@toniob.net




--- Comment #10 from Alan <alan@lxorguk.ukuu.org.uk>  2012-08-14 11:21:05 ---
*** Bug 20982 has been marked as a duplicate of this bug. ***

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