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bug#7932: 23.1; overprinting / cursor misalignment after certain charact

From: Jan Djärv
Subject: bug#7932: 23.1; overprinting / cursor misalignment after certain characters
Date: Sat, 29 Jan 2011 16:33:31 +0100
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; sv-SE; rv: Gecko/20110123 Thunderbird/3.1.8

Another thing to check, can you do:

% xrdb -query|grep Xft

before and after you connect the external monitor?


        Jan D.

David McArthur skrev 2011-01-28 16.41:
Upon typing certain characters in any buffer (including the minibuffer) the
cursor becomes misaligned and text is overprinted. These characters are:
AKkRrTVWwXxYyZ. This problem only occurs when I have my second monitor enabled.

The cursor is a blinking black box such that when the cursor is on top of
text, the text is printed in inverse (off-white). What happens after typing
one of AKkRrTVWwXxYyZ is that the black box is moved to the next position, but
the character I just typed blinks as though the cursor were still on top of
it. The next letter I type then appears twice: both in the correct position,
and also overprinted on top of the problem character to the left. Also, the
problem character is then re-printed one position to the left of where I typed
it, overprinting on the character before it. Further typing appears normally,
as long as the characters are not any of AKkRrTVWwXxYyZ.

For example, if I type "text" weird behavior starts after I type the lowercase
"x". What I see before I type the second "t" is "tex" with the blinking black
box to the right of x, but x is also blinking (alternating black and
off-white). After typing the second "t", what I see is "t#*t" where # is "x"
printed on top of "e" and * is "t" printed on top of "x". If I move the cursor
away and type C-l the text is redrawn correctly, but if I move the cursor back
over the problematic characters, the overprinting reoccurs.

This is on my laptop running Ubuntu Maverick. The problem occurs when I have
my external monitor enabled (regardless of which monitor the emacs window is
on). When the external monitor is disabled, the problem does not occur.

Here is a snippet from lspci -v

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS,
943/940GML Express Integrated Graphics Controller (rev 03) (prog-if 00 [VGA
Subsystem: Sony Corporation Device 81e6
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at dc200000 (32-bit, non-prefetchable) [size=512K]
I/O ports at 1800 [size=8]
Memory at c0000000 (32-bit, prefetchable) [size=256M]
Memory at dc300000 (32-bit, non-prefetchable) [size=256K]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Kernel driver in use: i915
Kernel modules: i915

Here is the info from M-x report-emacs-bug

In GNU Emacs 23.1.1 (i686-pc-linux-gnu, GTK+ Version 2.22.0)
of 2010-11-26 on vernadsky, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.10900000
configured using `configure '--build=i686-linux-gnu' '--host=i686-linux-gnu'
'--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
'--localstatedir=/var/lib' '--infodir=/usr/share/info'
'--mandir=/usr/share/man' '--with-pop=yes'
'--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars'
'build_alias=i686-linux-gnu' 'host_alias=i686-linux-gnu' 'CFLAGS=-DDEBIAN -g

Important settings:
value of $LC_ALL: nil
value of $LC_COLLATE: nil
value of $LC_CTYPE: nil
value of $LC_MESSAGES: nil
value of $LC_MONETARY: nil
value of $LC_NUMERIC: nil
value of $LC_TIME: nil
value of $LANG: en_US.utf8
value of $XMODIFIERS: nil
locale-coding-system: utf-8-unix
default-enable-multibyte-characters: t

Major mode: Outline

Minor modes in effect:
goto-address-mode: t
tooltip-mode: t
tool-bar-mode: t
mouse-wheel-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
global-auto-composition-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t
view-mode: t

Recent input:
r <return> s t u v w <return> x <return> y <return>
z <up> <down> <down> <return> <return> A K R T V W
X Y Z k r w x y <up> <right> C-l C-k C-/ <down> <left>
<left> <left> <left> <left> <left> <left> <left> <left>
<left> <left> <left> <left> <left> <left> <left> <left>
<left> <down> <down> <right> <right> <right> k <right>
r <right> <right> <right> w <right> x <right> y <right>
C-k C-l <up> C-l <down> <down> <down> <return> <return>
C-h C-p C-s c u r s o <right> <left> <left> <left>
<left> <left> <left> <left> <left> <down> <right> <right>
<down> <up> <left> <left> <left> <left> <right> <right>
<right> <right> <right> <left> <left> <left> <right>
<right> <right> <right> <right> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <right>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> C-s C-s C-s <down> <down> <down> <down>
<up> <up> C-x b <return> <up> <up> <right> <right>
<right> <right> <right> <right> <down> C-x b <return>
C-l <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <next> <prior> C-s C-s <down> <up> <up>
<up> <up> <up> <up> C-s C-s <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> C-s C-s C-s C-s C-s C-s <down> <down>
<down> <down> <up> <up> <up> <up> <up> <up> C-s C-s
C-s C-s C-s C-s C-s C-s C-s C-s M-x r e p o r t e m
a c s <backspace> <backspace> <backspace> <backspace>
<backspace> SPC e m a c s <tab> <return>

Recent messages:
Loading /var/cache/dictionaries-common/emacsen-ispell-default.el (source)...done
Loading debian-ispell...done
Loading /var/cache/dictionaries-common/emacsen-ispell-dicts.el (source)...done
Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...done
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