Public bug reported:
THis contains a fresh install of Ubuntu 18.10 to verify the solution at bug
1727356, for Intel-graphic-cards,
which do not support OpenGL 2.1 or higher.
This solution works.
A fresh install does not contain any monitors.xml file, to describe the dual
monitor-configuration.
I try to connect an internal laptop-monitor LVDS1 with maximal density 1280 x
800 and an external monitor VGA1
with density 1280 x 1024.
Display-manager gdm3 by default configures the external monitor at the right
side of the laptop-monitor.
This results into a logical screen of 2560 x 1024.
THe graphics card only supports a maximal width and height of 2048.
Therefore textures, that are too large, are splitted into multiple slices,
that fit.
Unfortunately this is not always done, causing textures of size 2560 x 1024 not
being allocated and crashing.
A quick and dirty hardcoded solution limiting the width to 2048
eliminates the crashes:
At cogl/cogl/cogl-texture-2d-sliced.c module setup_spans:
/* Negative number means no slicing forced by the user */
if (max_waste <= -1)
{
CoglSpan span;
if (max_width > 2048)
max_width = 2048;
At cogl/cogl/driver/gl/cogl-texture-2d-gl.c routine allocate_from_bitmap:
internal_format =
_cogl_texture_determine_internal_format (tex, cogl_bitmap_get_format (bmp));
if (width > 2048)
width = 2048;
In fact the external monitor is physically positioned above the laptop-monitor
and this is the configuration we want.
This results into a logical screen of 1280 x 1824 within the limits of the
graphics card.
To get this configuration the file monitors.xml was copied to $HOME/.config and
to /var/lib/gdm3/.config (to configure login screen).
By default Ubuntu 18.10 uses gdm3 with wayland at the login-screen and gdm3
without wayland after login.
Display-manager gdm3 with wayland ignores this monitors.xml file. To make the
file also usable for wayland the <configuration>
must be copied with <connector>VGA-1</connector> i.s.o.
<connector>VGA1</connector> and
<connector>LVDS-1</connector> i.s.o. <connector>LVDS1</connector> .
Curious!@#$#.
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: evince 3.30.0-2
ProcVersionSignature: Ubuntu 4.18.0-7.8-generic 4.18.5
Uname: Linux 4.18.0-7-generic i686
ApportVersion: 2.20.10-0ubuntu11
Architecture: i386
CurrentDesktop: ubuntu:GNOME
Date: Sat Sep 29 01:41:55 2018
ProcEnviron:
LANGUAGE=en_US:en
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: evince
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug cosmic i386
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https://bugs.launchpad.net/bugs/1795089
Title:
Gnome-shell crashes if dual monitor connected
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