After the last automatic upgrade (kernel?), the system suggested a restart to finalize the installation.
Immediately after the reboot, the graph login page worked at 640x480. Using "xdiagnose", checking (disabling) all, I was able to set the resolution 1280x1024, but no more capable to manage the dual-screen as before: in the "Monitor" configuration page, I see only one "Built-in Display" instead the two Acer AL1917 & AL1716 as before. Obviously, the HW connections are not been changed.
My PC is an Acer Veriton X4610G
CPU: Intel® Core™ i3-2120 @ 3.30GHz × 4
RAM: 4GiB (128MiB VGA shared)
I use an UBUNTU 16.04 LTS 64-bit
Thanks for any feedback!
Paolo
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-43.63-generic 4.4.21
Uname: Linux 4.4.0-43-generic x86_64
.tmp.unity_support_test.1:
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Mon Oct 17 15:39:54 2016
DistUpgraded: 2016-09-01 11:14:36,382 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0102] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] 2nd Generation Core Processor Family Integrated Graphics Controller [1025:0492]
InstallationDate: Installed on 2015-05-15 (521 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
Lsusb:
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 058f:6363 Alcor Micro Corp.
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Acer Veriton X4610G
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-43-generic root=/dev/mapper/ubuntu--vg-root ro plymouth:debug drm.debug=0xe nopat vesafb.invalid=1
Renderer: Software
SourcePackage: xorg
UpgradeStatus: Upgraded to xenial on 2016-09-01 (46 days ago)
dmi.bios.date: 05/30/2011
dmi.bios.vendor: Acer
dmi.bios.version: P01-B0
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: Veriton X4610G
dmi.board.vendor: Acer
dmi.chassis.type: 3
dmi.chassis.vendor: Acer
dmi.modalias: dmi:bvnAcer:bvrP01-B0:bd05/30/2011:svnAcer:pnVeritonX4610G:pvr:rvnAcer:rnVeritonX4610G:rvr:cvnAcer:ct3:cvr:
dmi.product.name: Veriton X4610G
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Mon Oct 17 15:32:10 2016
xserver.configfile: default
xserver.devices:
input Power Button KEYBOARD, id 6
input Power Button KEYBOARD, id 7
input AT Translated Set 2 keyboard KEYBOARD, id 8
input ImPS/2 Generic Wheel Mouse MOUSE, id 9
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.3-1ubuntu2.3
Yep, looks like this one and mine are stemming from the same root.