Public bug reported:
I have a T43 laptop connected to an external dock. I have connected two
monitors, one to VGA and other to DVI port of the dock. I used to both
external monitors with this setting using xinerama with fiesty. recently
when I upgraded to gutsy, the configuration no more works. I get an
error saying the "Requested entry already in use". The default
configuration using dpke-reconfigure xserver-xorg will get me a setting
when LVDS is mirrored with the monitor. Hunting around the net made me
realize that the old xinerama / dual head configs no longer work with
the ati drivers.
It appears that xrandr detects the displays:
~ > xrandr
Screen 0: minimum 320 x 200, current 2560 x 1024, maximum 2560 x 1024
VGA-0 connected (normal left inverted right)
1280x1024 59.9
640x480 60.0
DVI-0 connected 1280x1024+1280+0 (normal left inverted right) 376mm x 301mm
1280x1024 60.0*+ 76.0 75.0 71.9 69.8 59.9
1152x864 75.0 74.8
1024x768 75.1 70.1 60.0
832x624 74.6
800x600 72.2 75.0 60.3
640x480 75.0 72.8 66.7 60.0
720x400 70.1
LVDS connected 1280x1024+0+0 (normal left inverted right) 0mm x 0mm
1280x1024 59.9*
1280x800 60.0
1280x768 60.0
1024x768 60.0
800x600 60.3
640x480 59.9
S-video disconnected (normal left inverted right)
trying the following gets me a xinerama-like config:
xrandr --output LVDS --left-of DVI-0
But I am not able to get the VGA-0 as the primary and DVI-0 as the
secondary. The driver always choses LVDS as the primary display.
some relevant info:
~ > lspci
00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express
Processor to DRAM Controller (rev 03)
00:01.0 PCI bridge: Intel Corporation Mobile 915GM/PM Express PCI Express Root
Port (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI
Express Port 1 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI
Express Port 3 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family)
USB UHCI #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family)
USB UHCI #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family)
USB UHCI #3 (rev 03)
00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family)
USB UHCI #4 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family)
USB2 EHCI Controller (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev d3)
00:1e.2 Multimedia audio controller: Intel Corporation 82801FB/FBM/FR/FW/FRW
(ICH6 Family) AC'97 Audio Controller (rev 03)
00:1e.3 Modem: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97
Modem Controller (rev 03)
00:1f.0 ISA bridge: Intel Corporation 82801FBM (ICH6M) LPC Interface Bridge
(rev 03)
00:1f.2 IDE interface: Intel Corporation 82801FBM (ICH6M) SATA Controller (rev
03)
00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus
Controller (rev 03)
01:00.0 VGA compatible controller: ATI Technologies Inc M22 [Mobility Radeon
X300]
02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5751M Gigabit
Ethernet PCI Express (rev 11)
0b:00.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev 8d)
0b:02.0 Network controller: Intel Corporation PRO/Wireless 2200BG Network
Connection (rev 05)
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
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Can not use external VGA display (T43 + ATI + VGA)
https://bugs.launchpad.net/bugs/152021
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