[Bug 75997] [HSW eDP] Screen remains sometimes off on boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75997

--- Comment #8 from Xavier Hervy <xhervygds at gmail.com> ---
I do experience the same problem as far as I can tell.

xrandr -d :0.0 --output DP1  --off; xrandr -d :0.0 --output DP1  --rotate left
--auto

reproduce the problem 50% of the time. 

I am using Ubuntu 12.04.4
uname -r
3.11.0-15-generic

tested with Ubuntu 13.04 and 13.10 same problem

There is no trace of error in dmesg, xorg.log 
For xrandr the display appear to be working. This is not a backlight error as
the backlight is not handle by the motherboard. I should add that the eDP is
converted to LVDS.


intel_reg_dumper is not working for some reason "Couldn't map MMIO region:
Resource temporarily unavailable" and can not manage to compile it due to
depandancy error.

However I can attached some log file is desired and/or test with a more recent
Ubuntu version where intel_reg_dumper is working

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