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Old 02-19-2015, 03:20 AM   #1
_spectrum_
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5 pixel cut on left side of the screen


Dear all,

not sure if this issue is really sw or hw related.
I have a monitor ho pavillion 27xi (27 inches), on debian jessie.

My graphic card is Radeon HD6670 Turks, aps per lspci :

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Turks XT [Radeon HD 6670/7670]

The monitor works fine but, strangely, on left side, if i move a kde window to the left, about 5 pixels are cut-off. Like if the left black hw border cover these pixels. On the right side, it is perfectly aligned, no pixel cut. So seems a mix of scaling / horiz. alignment issue.

From the monitor osd menu, i don't find any helpful option.

Every help is very appreciated.
 
Old 02-19-2015, 04:39 AM   #2
veerain
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Usually monitors have an auto button/touch.
 
Old 02-19-2015, 04:45 AM   #3
Doc CPU
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Hi there,

Quote:
Originally Posted by veerain View Post
Usually monitors have an auto button/touch.
some don't, and if they do, it only affects the tuning to an analog source, i.e. VGA. If the monitor is connected to a digital source (DVI or HDMI), such an "auto set" function doesn't do anything.

But then again, the description of the phenomenon is in fact a typical effect of a misaligned signal timing in the analog signal processing. So, yes, it sounds very much like the OP is actually using VGA and should fine-tune the monitor to the VGA timing.

[X] Doc CPU
 
Old 02-21-2015, 07:53 AM   #4
_spectrum_
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There is no VGA here, monitor is connected trough HDMI. Also, the right border seems perfect, so it's not an horiz synch issue, sincle only the left side is slightly cut.

Also, i have a secondary screen connectred trough DVI, but don't think it can cause issue.

$ xdpyinfo | grep dimensions
xrandr | egrep '^[^ ]|[0-9]\*\+'
Screen 0: minimum 320 x 200, current 3600 x 1080, maximum 16384 x 16384
HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
1920x1080 60.00*+ 50.00 59.94
DVI-0 connected 1680x1050+1920+0 (normal left inverted right x axis y axis) 473mm x 296mm
1680x1050 59.95*+
VGA-0 disconnected (normal left inverted right x axis y axis)

Also, moving to console, (ALT+CTRL+F1) i don't see any pixel cut on the left.
So it could be also come XORG/KDE issue.

Last edited by _spectrum_; 02-21-2015 at 07:58 AM.
 
Old 02-21-2015, 11:05 AM   #5
TB0ne
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Quote:
Originally Posted by _spectrum_ View Post
There is no VGA here, monitor is connected trough HDMI. Also, the right border seems perfect, so it's not an horiz synch issue, sincle only the left side is slightly cut.

Also, i have a secondary screen connectred trough DVI, but don't think it can cause issue. Also, moving to console, (ALT+CTRL+F1) i don't see any pixel cut on the left. So it could be also come XORG/KDE issue.
Just a shot in the dark, but have you tried anything else on that screen? You say the console looks fine, but that's going to be a far different resolution, and a few pixels may not be as noticeable before the prompt. Have you tried Gnome or another DE? Windows??

I'd try to look at the monitors horizontal size/position settings first. It could be it needs a slight tweak, and has nothing to do with the DE. Again, that's a guess, but it's certainly the easiest thing to check/try.
 
Old 02-21-2015, 12:31 PM   #6
Shadow_7
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Is it the smaller resolution screen that is cut off? If you move the mouse to the far left does it pan and put those pixels back on screen?
 
Old 02-21-2015, 01:39 PM   #7
_spectrum_
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Hi, many thanks to follow,

well, as shadow 7 suggest, i moved the mouse all left, i seen 2 things:

1 - no desktop is moving / shifting
2 - mouse is stopping to the left border without any pixel cut.

But, when i move a console window to all left, it is auto aligned with 5 pixels cut (the border of the console window is cut out), while on the right side, console window is auto-aligned correctly, no cut.

I try to make available some printscreen

http://5.39.81.93/~angelo/extreme_left.png
http://5.39.81.93/~angelo/extreme_right.png

As you can see, the auto alignment of the console window on extreme left cut away 5 pixels abt (all the window border)

Update: no changes changing resolution, but if i disable the righmost small screen, aligning the window on extreme right, has same border cut effect.

Last edited by _spectrum_; 02-21-2015 at 01:49 PM.
 
Old 02-21-2015, 02:29 PM   #8
cepheus11
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This seems to be the intentional "snap-to-client" behaviour of recent kde versions. But you seem to have a window decoration with only ca. 1 Pixel on the right side so you don't notice it there.

https://bugs.kde.org/show_bug.cgi?id=325286
 
Old 02-21-2015, 05:03 PM   #9
_spectrum_
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Well, i changed settings ot the border decoration from "normal" to "thick". Now the window aligns correctly, no cut. So seems that this snap works align the body of the window without the decoration.

Also, snap works fine with normal decorations on right side of the current screen (big one, hdmi) and also if i snap to left side of the rightmost dvi screen (small). While the same issue is visible on the right of the rightmost screen. Issue is only visible on the 2 end of the global desktop.

Any workaround in mind ?
 
  


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