Hi Shirish, thanks for including the xorg.conf and .xsession-errors, but
unfortunately neither shows an error message.
Could you attach your /var/log/Xorg.0.log and the output of `sudo lspci -vvnn`?
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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after updates, no output displayed (i845)
https://bugs.launchpad.net/bugs/139556
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