Launcher icon size missing from System Settings, Appearance

[Colin Law]

Since a recent update to 12.04 the Launcher Icon Size adjustment is missing from System Settings > Appearance.
The launcher icons seem to have reverted to full size.
The problem is seen for all users on the machine.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-control-center 1:3.4.2-0ubuntu0.13.1
ProcVersionSignature: Ubuntu 3.2.0-58.88-generic-pae 3.2.53
Uname: Linux 3.2.0-58-generic-pae i686
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: i386
Date: Thu Feb 6 10:50:30 2014
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
MarkForUpload: True
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)
usr_lib_gnome-control-center:
 activity-log-manager-control-center 0.9.4-0ubuntu3.2
 deja-dup 22.0-0ubuntu4
 gnome-bluetooth 3.2.2-0ubuntu5
 indicator-datetime 0.3.94-0ubuntu2

[Sebastien Bacher (seb128)]

Thank you for your bug report. What packages did you update before the issue start? Do you use unity3d or 2d on your installation?

[Colin Law (colin-law)]

I see now that I had completely mis-diagnosed the problem. In fact the problem is that the system is reverting to Unity-2D and if I select 'Ubuntu' at login then it is still using 2D, so the issue is not with the settings at all (I assume that icon size is not adjustable on 2D). The system was using 3D before the update.

I see:
$ /usr/lib/nux/unity_support_test -p
X Error of failed request: BadRequest (invalid request code or no such operation)
  Major opcode of failed request: 153 (GLX)
  Minor opcode of failed request: 19 (X_GLXQueryServerString)
  Serial number of failed request: 22
  Current serial number in output stream: 22

which I guess is the problem.

lspci shows
VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS780D [Radeon HD 3300]

$ cat /var/log/apt/history.log
Start-Date: 2014-02-05 17:20:23
Commandline: apt-get dist-upgrade
Upgrade: fglrx:i386 (8.960-0ubuntu1.1, 13.101-0ubuntu0.0.1), lightdm:i386 (1.2.3-0ubuntu2.3, 1.2.3-0ubuntu2.4), python-apt:i386 (0.8.3ubuntu7.1, 0.8.3ubuntu7.2), libcurl3-gnutls:i386 (7.22.0-3ubuntu4.6, 7.22.0-3ubuntu4.7), jockey-common:i386 (0.9.7-0ubuntu7.11, 0.9.7-0ubuntu7.13), liblightdm-gobject-1-0:i386 (1.2.3-0ubuntu2.3, 1.2.3-0ubuntu2.4), libcurl3:i386 (7.22.0-3ubuntu4.6, 7.22.0-3ubuntu4.7), dkms:i386 (2.2.0.3-1ubuntu3.1, 2.2.0.3-1ubuntu3.2), fglrx-amdcccle:i386 (8.960-0ubuntu1.1, 13.101-0ubuntu0.0.1), flashplugin-installer:i386 (11.2.202.335ubuntu0.12.04.1, 11.2.202.336ubuntu0.12.04.1), jockey-gtk:i386 (0.9.7-0ubuntu7.11, 0.9.7-0ubuntu7.13), libcurl3-nss:i386 (7.22.0-3ubuntu4.6, 7.22.0-3ubuntu4.7), python-apt-common:i386 (0.8.3ubuntu7.1, 0.8.3ubuntu7.2)
End-Date: 2014-02-05 17:31:10

Could it be fglrx?

[Sebastien Bacher (seb128)]

seems like a video driver/xorg issue indeed