* [Bug 20142] enabling underscan by default behaves badly with so many monitors.
2010-10-12 10:34 [Bug 20142] New: enabling underscan by default behaves badly with so many monitors bugzilla-daemon
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From: bugzilla-daemon @ 2010-10-12 10:48 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=20142
Rafał Miłecki <zajec5@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
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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^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug 20142] enabling underscan by default behaves badly with so many monitors.
2010-10-12 10:34 [Bug 20142] New: enabling underscan by default behaves badly with so many monitors bugzilla-daemon
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From: bugzilla-daemon @ 2010-10-12 15:10 UTC (permalink / raw)
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Alex Deucher <alexdeucher@gmail.com> changed:
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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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^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug 20142] enabling underscan by default behaves badly with so many monitors.
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From: bugzilla-daemon @ 2010-10-13 0:05 UTC (permalink / raw)
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--- 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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From: bugzilla-daemon @ 2010-10-13 0:39 UTC (permalink / raw)
To: dri-devel
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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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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--- 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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From: bugzilla-daemon @ 2010-10-27 4:00 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=20142
John <john.ettedgui@gmail.com> changed:
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----------------------------------------------------------------------------
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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From: bugzilla-daemon @ 2010-11-03 18:40 UTC (permalink / raw)
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https://bugzilla.kernel.org/show_bug.cgi?id=20142
Jeff Layton <jlayton@redhat.com> changed:
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--- 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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From: bugzilla-daemon @ 2011-01-10 11:59 UTC (permalink / raw)
To: dri-devel
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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From: bugzilla-daemon @ 2012-08-14 11:07 UTC (permalink / raw)
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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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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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