Public bug reported:
I first discovered this problem in 14.04 Trusty and decided NOT to upgrade
because of it.
A recent update has brought this problem into 12.04 Precise ....
I have two systems that share a nice monitor using a kvm switch. The other is a
windows 7 machine.
Now, since this recent update (and also in the latest 14.04 Trusty release)
switching the monitor to display the other system and then back will cause the
resolution to be reset to an undesirable screen resolution (1400x1050), but the
resolution was 1920x1080 prior to the switch.
The 1920x1080 resolution is correctly selected at boot time.
Also, this system is setup as a dual screen with the other monitor being a
1280x1024 screen.
Why it now changes my1920x1080 LED monitor to use the 1400x1050 resolution
whenever I cycle the kvm is a complete mystery since it worked perfectly a week
or two ago before I got these recent updates.
Please bring back the old drivers until a solution is found.. that is
why I didn't update.
more info.
Besides this problem, VirtualBox 3d hardware support is broken... from the same
recent updates, had to turn it off
also Chrome's "Use hardware acceleration when available (requires Chrome
restart)" is broken too... had to turn that off too in order to get it stable
otherwise it was hanging or crashing left and right.
here is my xorg.conf
-----------------------------------
Section "ServerLayout"
Identifier "aticonfig Layout"
Screen 0 "aticonfig-Screen[0]-0" 0 0
EndSection
Section "Module"
Load "glx"
EndSection
Section "Monitor"
Identifier "aticonfig-Monitor[0]-0"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection
Section "Monitor"
Identifier "0-DFP2"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1280x1024"
Option "TargetRefresh" "60"
Option "Position" "0 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection
Section "Monitor"
Identifier "0-CRT1"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1920x1080"
Option "TargetRefresh" "60"
Option "Position" "1280 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection
Section "Device"
Identifier "aticonfig-Device[0]-0"
Driver "fglrx"
Option "Monitor-DFP2" "0-DFP2"
Option "Monitor-CRT1" "0-CRT1"
BusID "PCI:0:1:0"
EndSection
Section "Device"
Identifier "amdcccle-Device[0]-1"
Driver "fglrx"
Option "Monitor-DFP2" "0-DFP2"
BusID "PCI:0:1:0"
Screen 1
EndSection
Section "Device"
Identifier "Configured Video Device"
Driver "vboxvideo"
EndSection
Section "Screen"
Identifier "Default Screen"
DefaultDepth 24
EndSection
Section "Screen"
Identifier "aticonfig-Screen[0]-0"
Device "aticonfig-Device[0]-0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Virtual 3200 3200
Depth 24
EndSubSection
EndSection
Section "Screen"
Identifier "amdcccle-Screen[0]-1"
Device "amdcccle-Device[0]-1"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
---------------------------
here is my output from xrandr
------------------------
xrandr
Screen 0: minimum 320 x 200, current 3200 x 1080, maximum 16384 x 16384
DFP1 disconnected (normal left inverted right x axis y axis)
DFP2 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x
301mm
1280x1024 60.0*+ 75.0
1280x960 75.0 60.0
1280x768 75.0 60.0
1280x720 75.0 60.0
1024x768 75.0 70.1 60.0
800x600 72.2 75.0 60.3 56.2
640x480 75.0 72.8 66.6 59.9
CRT1 connected 1920x1080+1280+0 (normal left inverted right x axis y axis)
598mm x 336mm
1920x1080 60.0*+
1680x1050 60.0
1400x1050 60.0
1600x900 60.0
1280x1024 75.0 60.0
1440x900 75.0 59.9
1280x960 60.0
1152x864 60.0 75.0
1280x768 60.0
1280x720 60.0
1024x768 75.0 70.1 60.0
800x600 72.2 75.0 60.3 56.2
640x480 75.0 72.8 67.0 59.9
------------------------
lsb_release -rd
Description: Ubuntu 12.04.5 LTS
Release: 12.04
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1389473
Title:
Screen resolution changes after using kvm switch
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