I forgot to add my follow-up.
It's actually very strange. Here are my results:
* If I boot with nomodeset, there is no flickering but I cannot use any
external display (my monitor appears in X.log but not seen by xrandr)
* If I boot without nomodeset (and with xorg-edgers ppa) with my external VGA
monitor plugged, most of the time there is no flickering (at boot) but it does
flickers (on laptop screen) after a standby.
* If I boot only on laptop (no external monitor), it does flicker all the time.
FInally, a cold boot on the morning on Win7 doesn't lead to flickering
(either with or without external monitor plugged). But, if I get a
flickering screen on Linux next reboot (or shutdown + cold boot within
minutes) it impacts, bios, grub and Win7.
I ordered the very same laptop with Nvidia card, I will make the test in
few days to see if I get the same issue.
** Changed in: xorg (Ubuntu)
Status: Invalid => New
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https://bugs.launchpad.net/bugs/794474
Title:
latitude e6420 screen flickering (sandy bridge intel video card)
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