Hi! since 11.10 dual monitor works fine but since upgrade 12.10 to 13.04 is not
able. Only the mirror was permited but try to unmirror some erratic behavior
occur on login screen(total black) I do re-installed 13.04 and problem still.
my config is the following
*-display
description: VGA compatible controller
product: Trinity [Radeon HD 7640G]
vendor: Advanced Micro Devices [AMD] nee ATI
physical id: 1
bus info: pci@0000:00:01.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0t
resources: irq:54 memory:e0000000-efffffff ioport:3000(size=256)
memory:f0300000-f033ffff
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 13.04
Release: 13.04
Codename: raring
Linux A8-G4-HP-NOTE 3.8.0-19-generic #30-Ubuntu SMP Wed May 1 16:36:13 UTC 2013
i686 athlon i686 GNU/Linux
External monitor is a Samsung Syncmaster 721s
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https://bugs.launchpad.net/bugs/1174368
Title:
Ubuntu 13.04 External Monitor problem
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