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[macavity <bschroder@xxxxxxxxx>]

I have some additional data about this bug.

Just restarting X doesn't trigger xrandr to re-poll for the new monitor.
I have to reboot before I can connect to a new external monitor.

I also found a ton of these lines in my /var/log/messages:

Nov 27 22:07:16 x200 kernel: [  474.120523] i915 0000:00:02.0: VGA-1: no EDID data
Nov 27 22:07:16 x200 kernel: [  474.126200] i2c-adapter i2c-0: unable to read EDID block.
Nov 27 22:07:16 x200 kernel: [  474.126209] i915 0000:00:02.0: VGA-1: no EDID data
Nov 27 22:07:16 x200 kernel: [  474.324904] i2c-adapter i2c-2: unable to read EDID block.

So could this be an issue with i915 or the i2c modules?

$modinfo i2c_algo_bit
filename:       /lib/modules/2.6.31-16-generic/kernel/drivers/i2c/algos/i2c-algo-bit.ko
license:        GPL
description:    I2C-Bus bit-banging algorithm
author:         Simon G. Vogl <simon@xxxxxxxxxxxxxxxxx>
srcversion:     28BBBD6363E5D43C593618B
depends:        
vermagic:       2.6.31-16-generic SMP mod_unload modversions 586 
parm:           bit_test:Test the lines of the bus to see if it is stuck (bool)


$ modinfo i915
filename:       /lib/modules/2.6.31-16-generic/kernel/drivers/gpu/drm/i915/i915.ko
license:        GPL and additional rights
description:    Intel Graphics
author:         Tungsten Graphics, Inc.
license:        GPL and additional rights
srcversion:     D132ABBF5BE25AD13F68D5D
alias:          pci:v00008086d00000046sv*sd*bc03sc00i*
alias:          pci:v00008086d00000042sv*sd*bc03sc00i*
alias:          pci:v00008086d000035E8sv*sd*bc03sc00i*
alias:          pci:v00008086d0000A011sv*sd*bc03sc00i*
alias:          pci:v00008086d0000A001sv*sd*bc03sc00i*
alias:          pci:v00008086d00002E42sv*sd*bc03sc00i*
alias:          pci:v00008086d00002E32sv*sd*bc03sc00i*
alias:          pci:v00008086d00002E22sv*sd*bc03sc00i*
alias:          pci:v00008086d00002E12sv*sd*bc03sc00i*
alias:          pci:v00008086d00002E02sv*sd*bc03sc00i*
alias:          pci:v00008086d00002A42sv*sd*bc03sc00i*
alias:          pci:v00008086d00002A12sv*sd*bc03sc00i*
alias:          pci:v00008086d00002A02sv*sd*bc03sc00i*
alias:          pci:v00008086d000029D2sv*sd*bc03sc00i*
alias:          pci:v00008086d000029C2sv*sd*bc03sc00i*
alias:          pci:v00008086d000029B2sv*sd*bc03sc00i*
alias:          pci:v00008086d000029A2sv*sd*bc03sc00i*
alias:          pci:v00008086d00002992sv*sd*bc03sc00i*
alias:          pci:v00008086d00002982sv*sd*bc03sc00i*
alias:          pci:v00008086d00002972sv*sd*bc03sc00i*
alias:          pci:v00008086d000027AEsv*sd*bc03sc00i*
alias:          pci:v00008086d000027A2sv*sd*bc03sc00i*
alias:          pci:v00008086d00002772sv*sd*bc03sc00i*
alias:          pci:v00008086d00002592sv*sd*bc03sc00i*
alias:          pci:v00008086d0000258Asv*sd*bc03sc00i*
alias:          pci:v00008086d00002582sv*sd*bc03sc00i*
alias:          pci:v00008086d00002572sv*sd*bc03sc00i*
alias:          pci:v00008086d00003582sv*sd*bc03sc00i*
alias:          pci:v00008086d00002562sv*sd*bc03sc00i*
alias:          pci:v00008086d00003577sv*sd*bc03sc00i*
depends:        drm,video,intel-agp,i2c-algo-bit
vermagic:       2.6.31-16-generic SMP mod_unload modversions 586 
parm:           modeset:int
parm:           fbpercrtc:int

-- 
Karmic's xrandr doesn't update when connected to different external monitor
https://bugs.launchpad.net/bugs/495063
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