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

From: David McArthur
Subject: bug#7932: 23.1; overprinting / cursor misalignment after certain characters
Date: Mon, 31 Jan 2011 10:55:13 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101208 Thunderbird/3.1.7

On 01/29/2011 05:10 AM, Jan Djärv wrote:
> Does the situation fix itself if you do C-l or iconify and restore
> the Emacs frame?

Yes. The problem then re-surfaces if I run the cursor back over those characters.

> Can you put the cursor on one of the characters and do C-c
> C-x C-= and mail the results?

        C-c C-x C-= is undefined

Am I trying to do xscheme-send-control-x-interrupt?  C-h a xscheme gives me

        No apropos matches for `xscheme'

On 01/29/2011 10:33 AM, Jan Djärv wrote:
> Another thing to check, can you do:
> % xrdb -query|grep Xft
> before and after you connect the external monitor?

The result is identical before and after:

Xft.antialias:  1
Xft.dpi:        96
Xft.hinting:    1
Xft.hintstyle:  hintslight
Xft.lcdfilter:  lcddefault
Xft.rgba:       rgb

On 01/29/2011 05:10 AM, Jan Djärv wrote:
Can you try a newer Emacs version? 23.2 has been out a while.
If you can try trunk also that would be great (see

Okay, I'll try this next.

On 01/28/2011 01:52 PM, Stefan Monnier wrote:
> While this may very well be an Emacs bug, I think there's a chance
> this is a bug in your X server (at least, I've seen somewhat similar
> problems in the past with a bug in some of the acceleration code in
> the `nv' driver).
> Can you maybe try to fiddle with your X11 driver, like turning off
> the acceleration, and/or switching between EXA, UXA, XAA, and/or
> whichever other acceleration framework they came up with?

I don't know anything about X11 drivers, so this may take me a little while to figure out how to do. I'll try it second.


David McArthur

> 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
>> controller])
>> 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'
>> '--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.1/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.1/leim'
>> '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars'
>> 'build_alias=i686-linux-gnu' 'host_alias=i686-linux-gnu'
>> -O2' 'LDFLAGS=-g' 'CPPFLAGS=''
>> 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
>> For information about GNU Emacs and the GNU system, type C-h C-a.
>> Undo!
>> Note: file is write protected
>> View mode: type C-h for help, h for commands, q to quit.
>> Mark saved where search started [6 times]
>> /usr/bin/mail is not an executable. Setting mail-interactive to t.

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