I confirm this problem with Dell Latitude D420 after upgrading to 9.10
I have it connected to an external display 1680x1050 (AOC 2216a) 
When I set them mirrored I cannot set higher resolution;
When they are unmirrored after setting external  display resolution screen gets 
dark with activer mouse pointer. After some time system stops to respond all 
together.
I didn't have this issue with 9.04.

lspci -nn |grep VGA
     00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 
945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 
03)

sudo lshw -c video
  *-display:0             
       description: VGA compatible controller
       product: Mobile 945GM/GMS, 943/940GML Express Integrated Graphics 
Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: p...@0000:00:02.0
       version: 03
       width: 32 bits
       clock: 33MHz
       capabilities: msi pm bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:16 memory:eff00000-eff7ffff ioport:eff8(size=8) 
memory:d0000000-dfffffff(prefetchable) memory:efec0000-efefffff
  *-display:1 UNCLAIMED
       description: Display controller
       product: Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics 
Controller
       vendor: Intel Corporation
       physical id: 2.1
       bus info: p...@0000:00:02.1
       version: 03
       width: 32 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list
       configuration: latency=0
       resources: memory:eff80000-efffffff


** Attachment added: "lspci -vvn.lst"
   http://launchpadlibrarian.net/34815147/lspci%20-vvn.lst

-- 
[i945GM] dual screen not working with virtual resolution enabled: just a blank 
screen with a mouse pointer
https://bugs.launchpad.net/bugs/383345
You received this bug notification because you are a member of Ubuntu-X,
which is the registrant for xf86-video-intel.

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