Ubuntu
lyx package

lyx scrolling jumps up the cpu and sluggish

Bug #756671 reported by baytuni on 2011-04-10

32

This bug affects 6 people

Affects		Status	Importance	Assigned to	Milestone
	lyx (Ubuntu)	Confirmed	Undecided	Unassigned

Bug Description

Binary package hint: lyx

When scrolling down in a document with tables and figures (images not shown on the document) scrolling makes X server use a high amount of cpu and the output of scroll on the screen is slow and sluggish.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: lyx 2.0.0~rc1-1
ProcVersionSignature: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
Architecture: amd64
Date: Sun Apr 10 18:35:21 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
LANGUAGE=en_US:en
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: lyx
UpgradeStatus: Upgraded to natty on 2011-04-07 (3 days ago)

Tags:

Revision history for this message

baytuni (oytun-peksel) wrote on 2011-04-10:

#1

Dependencies.txt Edit (2.1 KiB, text/plain; charset="utf-8")

Revision history for this message

baytuni (oytun-peksel) wrote on 2011-04-10:

#2

before.png Edit (293.8 KiB, image/png)

Before scrolling

Revision history for this message

baytuni (oytun-peksel) wrote on 2011-04-10:

#3

after.png Edit (305.0 KiB, image/png)

While scrolling

Revision history for this message

humanplayer2 (humanplayer2) wrote on 2011-05-12:

#4

Same problem.

I would like to point out that cpu usage rises even when not scrolling vertically, but also when one moves the cursor horizontally through text -- in particular math and spell-check environments.

Revision history for this message

rawphi (raphael-ist) wrote on 2011-07-03:

#5

http://comments.gmane.org/gmane.editors.lyx.general/70264 talks about this being a regression in the QT libraries.

As a workaround, you can add the line:

\force_paint_single_char false

into the lyx preferences file (~/.lyx/preferences) & restart lyx

Revision history for this message

Launchpad Janitor (janitor) wrote on 2011-11-07:

#6

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in lyx (Ubuntu):
status:	New → Confirmed

Revision history for this message

Dan Lea (danlea) wrote on 2011-11-07:

#7

I have this problem intermittently with a small document (it comes and goes fairly inexplicably) and the '\force_paint_single_char false' workaround doesn't seem to help.

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