[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

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https://bugs.documentfoundation.org/show_bug.cgi?id=58358

David Burleigh  changed:

   What|Removed |Added

 Status|RESOLVED|REOPENED
 Resolution|WORKSFORME  |---

--- Comment #68 from David Burleigh  ---
This problem is still present in the latest versions. I verified this today in
versions 6.1.5.2 and 6.2.2.1, which I have installed. Fortunately, I still have
version 6.0.7.3 installed, and it does NOT have this problem. Scrolling through
text in Writer is also noticeably slower in versions 6.1.5.2 and 6.2.2.1, in
comparison to version 6.0.7.3. Apparently this is a regression, which prevents
me (and I assume others also) from enjoying the features in the newer releases.

I am running Ubuntu 18.10, Mate Edition, but with the Cinnamon Desktop.

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

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--- Comment #67 from zian rizky  ---
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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=58358

Cor Nouws  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 CC||c...@nouenoff.nl
 Resolution|--- |WORKSFORME

--- Comment #66 from Cor Nouws  ---
Hi John,

(In reply to John L. ten Wolde from comment #65)
> Several days ago I upgraded to Mageia 6 which switched me from KDE4 to
> Plasma 5 and, while I was at it, I also pulled in LibreOffice Fresh 5.4.0.3.
> *Finally* I can use LO with full sub-pixel rendering enabled.  I no longer
> see corruption in Writer or the Help browser (I haven't checked the other
> components yet).  Whether this is because of a fix in LO or it's because of
> the switch to Plasma 5, I have no idea.
> 
> It's been a long 4 to 5 years of living with this headache, but for the
> moment it WORKSFORME.  Hopefully the fix was in LO and the issue is resolved


Thanks for reporting and sorry that it annoyed you such a long time. As you can
notice from the comments/QA-volunteers, it didn't seem a general issue, easy to
reproduce, rather something due to specific circumstance(s) XYZ.. ;)

> for the rest of you as well.  Maybe we can finally put this bug to bed.
> 
> OpenGL is still a colossal train wreck though...

:)  
Thanks again & enjoy LibreOffice!
Cor

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

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https://bugs.documentfoundation.org/show_bug.cgi?id=58358

--- Comment #65 from John L. ten Wolde  ---
Several days ago I upgraded to Mageia 6 which switched me from KDE4 to Plasma 5
and, while I was at it, I also pulled in LibreOffice Fresh 5.4.0.3.  *Finally*
I can use LO with full sub-pixel rendering enabled.  I no longer see corruption
in Writer or the Help browser (I haven't checked the other components yet). 
Whether this is because of a fix in LO or it's because of the switch to Plasma
5, I have no idea.

It's been a long 4 to 5 years of living with this headache, but for the moment
it WORKSFORME.  Hopefully the fix was in LO and the issue is resolved for the
rest of you as well.  Maybe we can finally put this bug to bed.

OpenGL is still a colossal train wreck though...

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

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--- Comment #64 from David Burleigh  ---
This bug still affects version 5.3.4.2

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

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https://bugs.documentfoundation.org/show_bug.cgi?id=58358

Thomas Lendo  changed:

   What|Removed |Added

 Blocks||108075


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=108075
[Bug 108075] [META] Scrolling and Page up/down issues
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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

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https://bugs.documentfoundation.org/show_bug.cgi?id=58358

Rpnpif  changed:

   What|Removed |Added

   Hardware|x86 (IA32)  |All

--- Comment #63 from Rpnpif  ---
All x86 hardware (x86 and x86-64) has this issue.

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

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https://bugs.documentfoundation.org/show_bug.cgi?id=58358

--- Comment #62 from 3191602...@qq.com ---
Well, I would not rush to blame drivers and video cards. It's more likely that
LO is to blame. I have the same problem on win 10 laptop, 4K screen, with
nvidia 4GB, bought just a few days ago. When I scroll down through text, the
lines get meshed up, cut, distorted, the whole gamut of things that can go
wrong appears.

I use 5.3.2.2 LO.

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

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--- Comment #61 from John L. ten Wolde  ---
Just an informational bump to report that there is no improvement whatsoever in
5.3.0.3.

Also, I ran across these two meta bugs tracking OpenGL issues: bug 94691 (OS
agnostic) and bug 97937 (Linux specific). Just in case our bug is tangentially
related to the ongoing OpenGL shenanigans I thought I'd link them here.

--
(In reply to Renato Miró from comment #59)
> I'm sorry it didn't work for you, John.
Hi Renato.  I think you misunderstood my retraction in comment #58.  I jumped
to erroneous conclusions about the bug being fixed, not about your workaround
being ineffective.  As far as I've seen, it (your workaround) always does the
job.  I apologise for putting you up to all that typing.  Cheers.

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--- Comment #60 from Renato Miró  ---
Created attachment 130268
  --> https://bugs.documentfoundation.org/attachment.cgi?id=130268=edit
Problem with anti-aliasing and subpixel rendering off

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

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--- Comment #59 from Renato Miró  ---
I'm sorry it didn't work for you, John. In my case, I did some tests and
verified that other Xorg options (ShadowFB off, BackingStore off, Silkenmouse
off) didn't help -- while NoAccel effectively prevented problems in Libreoffice
and in other situations, both when using Xfce and KDE4 (on Mageia 5).

Perhaps this is a complex bug which results from problems both in the X11
drivers and Libreoffice's inability to deal with these driver problems.

BTW, what hardware & driver combination are you using (please describe the
machines on which the bug occurs).

If you're using an Nvidia card, have you tried Nouveau? Have you tried the VESA
or fbdev driver (if any of these works in your hardware)

It's also worth noting that maybe, in spite of symptoms being similar,
solutions might not be the same on different hardware. I'm attaching an image
of the bug happening over here with anti-aliasing turned off, which apparently
would prevent the bug on your hardware.

To test a big document, I used "WG42-WriterGuideLO.odt", available online with
480+ pages and ~14MB. With option NoAccel, no problem happened over here.

I don't know much, really, but these problems are usually associated with bad
screen handling: either two things are writing to the video memory, a buffer is
updated with the wrong content, the screen is refreshed from the buffer and
partially overwrites what Libreoffice has already written, or Libreoffice
writes to the wrong buffer, or maybe there's even a speed problem. In my case
using acceleration seemingly causes that sort of mistakes in screen updating.
Maybe if we knew details about your hardware (particularly the video card brand
and model), we could search for similar problems on that hardware.

Good luck!

PS: If you really have to live without font anti-aliasing, try to use a big
resolution. At 1920x1080 I feel less need to use sub-pixel rendering.

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--- Comment #58 from John L. ten Wolde  ---
Sigh...

Disregard my excitement in comment 57.  It was premature and I was wrong.  Upon
opening a document more than a couple of pages long I see that the corruption
in the editing window persists.  All is the same as it has been for so long. 
I've disabled sub-pixel rendering again.  :-(

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--- Comment #57 from John L. ten Wolde  ---
Created attachment 129887
  --> https://bugs.documentfoundation.org/attachment.cgi?id=129887=edit
LO 5.2.4.2 help browser still borked with sub-pixel rendering enabled.


It's a Christmas Miracle!  Well, sort of...

I just installed 5.2.4.2 from Fresh and amazingly I am finally able to activate
sub-pixel rendering without it corrupting Writer's editing window. 
Unfortunately, as you can see from the attached screen shot, it still does
corrupt the Help Browser. In any case this is a huge step forward!

Happy Holidays everyone.


P.S.  I neglected to respond to Renato in comment 55 and comment 56, but after
doing some testing of my own, he is absolutely correct: on Linux, disabling
hardware acceleration in xorg.conf (awful a choice as that is to have to make)
completely prevents this bug from manifesting itself.

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--- Comment #56 from Renato Miró  ---
Hello everyone... I would like some new facts which happened on the hardware I
mentioned in comment #53 (a notebook with SiS 771/671 graphics and using the
sisimedia X driver).

Just to summarize, in Mageia 5 everything went fine and only Libreoffice had a
problem exactly as shown in the clear attachments by Mr. Heinz Repp.

Now, I'm testing the Mageia 6 stable 1 release and surprisingly found that
things work the opposite way: after installing, display corruption occurs e.g.
in a terminal while using midnight commander -- but not in Libreoffice, which
works perfectly. This is the Mageia bug:

  https://bugs.mageia.org/show_bug.cgi?id=19620

The workaround is the same: disabling acceleration in xorg.conf (and not in
Libreoffice!).

Between Mageia 5 and 6 something weird happened and I'm inclined to believe it
is related to X11 and its drivers -- and not to Libreoffice.

It seems to me that Libreoffice is not at fault in the present case.

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

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--- Comment #55 from Renato Miró  ---
(In reply to John L. ten Wolde from comment #54)
> (In reply to Renato Miró from comment #53)

> Hi Renato.

Hi, John, how do you do?

> The description of your issue is so similar to mine and others

> make sure that your sub-pixel rendering is disabled:

> KDE System Settings > Application Appearance > Fonts > Use Anti-Aliasing
> [Configure...]

Sorry, didn't work in my case. I guess this "winmodem"-style video card is way
more primitive than whatever hardware you may have. To me, that Thomas guy is
starting to look like a hero.

> but given the choice between sub-pixel rendering versus hardware
> acceleration, I'd choose to dump sub-pixels in order to keep hardware
> acceleration every time.

I would, too, but this chip only uses EXA ("Option AccelMethod not used" in the
X log). I tried to select XAA, but got that message. Besides, frankly,
accelerated means glxgears gives 99 fps instead of 81.

> For a more verbose treatment on all this, see my step-by-step report at Bug
> 69011.  Note I wrote that report while running Mageia 3 and much of the
> flakiness KDE was exhibiting at that time has since been ironed out.

I've read it to check whether I did the right steps. Though in my case, KDE is
choosing Xrender even when I opt for OpenGL 1.2 -- which means my problems are
not really about GL.

> Best of luck.

Likewise, my friend. For your information, I'm using the document
"BH3501-IntroductiontoBase.odt" (just search "BH3501 filetype:odt" on Google).
Scrolling the first page already clearly creates artifacts.

Off-topic, but perhaps related: I've read elsewhere that "unusual" DPI settings
can also lead to problems. Not sure about it, but the theory goes like
rescaling 96DPI fonts to, say, 117 DPI could produce truncation errors (because
we can't have 0.5 pixel) and thus the recomendation was to use more exact
multiples like 96 itself or 120 (=96 x 1.25). Don't know if that makes any
difference. Some three years ago I had problems with fonts in Firefox, now I
don't. 

> P.S.  I've still got my fingers crossed that when the remaining issues with
> OpenGL get sorted and we Linux users can actually enable it again -- for
> examples see Bug 97904 and Bug 99299 -- all this will be just an ugly
> memory.  In Bug 97904, comment 4, Caolán committed an OpenGL patch to 5.1.2,
> but I haven't noticed a difference so far.  I'm hoping it works in the 5.2.x
> branch.

Not that it helps in your case, but for the record I use Libreoffice a lot with
Intel integrated video and old Nvidia Geforce cards (10+ year old!) and can say
without any chance of mistake that I have not had any kind of problem before
like the present one.

Also, check the OpenGL version which your h/w accepts. I once tried to use
OpenGL 2.0 with a board which would only accept 1.2 with disastrous
consequences; in the same vein, don't deactivate OpenGL (Mesa) and try to run
Libreoffice with that "Use OpenGL..." option activated. It will crash
repeatedly at start until you edit a *.xcu file in ~/.config/libreoffice to
change it back to false.

IMHO it's possible that it is the case of a bad interaction between the
hardware+driver set and some low-level video access by Libreoffice. It's even
possible there's no bug in Libreoffice but rather some shortcoming in these
more, erm, "exotic" video cards -- which other packages learned to avoid but
which is still not worked around by LO.

Thanks, again!

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

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--- Comment #54 from John L. ten Wolde  ---
(In reply to Renato Miró from comment #53)
> A workaround I found is disabling acceleration in xorg.conf (Option
> "NoAccel" "True"). Using that option for this hardware and driver makes the
> problem go away. I don't know if the same solution will help other kinds of
> hardware.

Hi Renato.  The description of your issue is so similar to mine and others that
I'm not convinced your video hardware is at fault.  I'm also using KDE under
Mageia 5 (but with LO Fresh 5.1.4) and this issue still persists for me.  As a
possibly more satisfactory workaround, I recommend checking to make sure that
your sub-pixel rendering is disabled:

KDE System Settings > Application Appearance > Fonts > Use Anti-Aliasing
[Configure...]

If it isn't, disable it, then re-enable your hardware acceleration, and see if
this improves your user experience.  If it does, you'll likely notice a slight
degradation in the appearance of fonts in other apps (notably Firefox), but
given the choice between sub-pixel rendering versus hardware acceleration, I'd
choose to dump sub-pixels in order to keep hardware acceleration every time.

For a more verbose treatment on all this, see my step-by-step report at Bug
69011.  Note I wrote that report while running Mageia 3 and much of the
flakiness KDE was exhibiting at that time has since been ironed out.


Best of luck.


P.S.  I've still got my fingers crossed that when the remaining issues with
OpenGL get sorted and we Linux users can actually enable it again -- for
examples see Bug 97904 and Bug 99299 -- all this will be just an ugly memory. 
In Bug 97904, comment 4, Caolán committed an OpenGL patch to 5.1.2, but I
haven't noticed a difference so far.  I'm hoping it works in the 5.2.x branch.

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

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--- Comment #53 from Renato Miró  ---
Hi, I'm trying to reuse an old notebook with the following specs:

- Pentium T3400 (fairly reasonable 64-bit CPU)
- 2 GB RAM
- 14" 1280x800 LCD controlled by a SiS 771/671 chip <-- the problem!

That chip is somewhat of a pain to use in Linux. Originally with Vista, I only
found an "official" driver for Win7 at SiS. For Linux/Xorg, there's a driver
(sisimedia) by Thomas Winischhofer, which Mageia 5 makes available.

Though only able to play videos at 640x480 maximum, the driver enables
satisfactory use of most other kinds of applications at 1280x800. Firefox,
Dolphin, Thunar, KPatience, Chromium BSU, Megamario, Okular, Kwin & KDE
settings, Xfcewm & Configuration Manager... every program I ran did not present
any kind of problem when scrolling (I tried also to vary the zoom). Programs
were retested to ensure accuracy in the present report.

In Libreoffice Writer 4.4.7.2 (the version in Mageia 5) I can see the same kind
of artifact shown on the previously attached pics. Also, I verified the
problems seems to disappear below 55% zoom. The problem shows in Print layout
and Web layout likewise.

I confirm Heinz Repp's comment #14 here, too, with regard to the same settings
mentioned -- no setting in Libreoffice could improve the situation.

Calc does not present that behavior. On a simple spreadsheet (columns with
months' names), at varying zoom scales, text was always perfectly rendered.

BUT:

A workaround I found is disabling acceleration in xorg.conf (Option "NoAccel"
"True"). Using that option for this hardware and driver makes the problem go
away. I don't know if the same solution will help other kinds of hardware.

Thanks!

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--- Comment #52 from Heinz Repp  ---
If it was that easy to close a bug that bites only a very small minority: just
find someone who is not involved to close it worksforme: you could get rid of
most of the bugs here in no time ...

btw, still present and unchanged in Libreoffice 5.1.3.2 on Ubuntu 14.04.3 32
bit ...

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Heinz Repp  changed:

   What|Removed |Added

 Status|RESOLVED|NEW
 Resolution|WORKSFORME  |---

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Jean-Baptiste Faure  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 CC||jbfa...@libreoffice.org
 Resolution|--- |WORKSFORME

--- Comment #51 from Jean-Baptiste Faure  ---
Not reproducible for me with LO 5.1.4.0.0+ built at home under Ubuntu 16.04
x86-64.

Closing as WorksForMe. Please feel free to reopen if it is still reproducible
for you with current stable version. In that case, please attach a document
with which you reproduce the problem.

Best regards. JBF

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=58358

V Stuart Foote  changed:

   What|Removed |Added

Version|5.0.3.2 release |3.6.2.2 release

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=58358

karl  changed:

   What|Removed |Added

Version|3.6.2.2 release |5.0.3.2 release

--- Comment #50 from karl  ---
I too have the problem with latest release of LibreOffice when using tables or
spreadsheets. It seems to occur with either one line or one word.
Zoom 120% 
Corrected when scrolling past the text and returning.
Text does not render correctly. This bug also appears on both Writer and Calc

I have disabled Hardware acceleration and anti-alisting as suggested in the
comments (many thanks) and not yet been able to recreate the bug when disabled.

5.1.0.3
Win10 64-bit

See "Text scrolling glitch when using tables" attachment.

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=58358

--- Comment #49 from karl  ---
Created attachment 122945
  --> https://bugs.documentfoundation.org/attachment.cgi?id=122945=edit
Text scrolling glitch when using tables

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=58358

--- Comment #48 from gobber  ---
My problem: https://bugs.documentfoundation.org/show_bug.cgi?id=58358#c47
seems to have been resolved in v5.0.3.2

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=58358

--- Comment #47 from gob...@hotmail.com ---
Created attachment 120288
  --> https://bugs.documentfoundation.org/attachment.cgi?id=120288=edit
render gap windows7 x64 at 50% zoom

While scrolling gaps appear when more than 1 page is displayed (side by side).
It doesn't matter what zoom level is picked.

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=58358

--- Comment #46 from Heinz Repp heinz.r...@arcor.de ---
Some news from my side:

1. Using Gnome, I had some tests with various combinations of hinting and
anti-aliasing using gnome-tweak-tool, with mixed results - sometimes this bug
was barely reproducible, but then with identical settings it was prevalent all
the time.

2. This bug bites me also with the new 5.0.0.5 version

3. I made a new observation: when this bug strikes, and I scroll _very slowly_,
I can see:
- screen advances one stripe, old contents is still there where the next
content should show up
- with a remarkable delay the new content is drawn
When I scroll faster than the new content is drawn, the old content is repeated
over and over
- when I scroll back one step, and then scroll forward very slowly, I often can
correct the wrong content.

Looks like following is going on when scrolling:
1. already painted and cached areas are copied to the new location
2. the newly visible area is painted and cached
Whenever a new iteration of this procedure happens before step 2 of the
previous step finished, the next 1st step will copy also content and cache of
the previous new area even when it hasn't been updated until then, copying the
old previous content. It is a kind of cache poisoning, as invalid content still
waiting to be newly painted is cached and thus validated.

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=58358

Zangune zang...@users.sourceforge.net changed:

   What|Removed |Added

 CC||Zangune@Users.SourceForge.N
   ||et
 Whiteboard|SummaryUpdate   |summaryUpdate

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[Libreoffice-bugs] [Bug 58358] VIEWING Scrolling broken - page totally distorted [Summary: comment#38, comment#42]

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=58358

andrew andrew.be...@mymail.champlain.edu changed:

   What|Removed |Added

Summary|VIEWING Scrolling broken -  |VIEWING Scrolling broken -
   |page totally distorted  |page totally distorted
   |[Summary: comment#38,   |[Summary: comment#38,
   |commet#42]  |comment#42]

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