This still happens on Ubuntu 14.04 64 bit. I am using Thinkpad T440S.
The following workaround works for me:
http://askubuntu.com/questions/151651/brightness-is-reset-to-maximum-on-
every-restart
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After recovering from screen dimming, the brightness is set set maximum
for my case. For this problem, I follow the instructions in
https://wiki.ubuntu.com/Kernel/Debugging/Backlight. After adding
acpi_backlight=vendor kernel parameter, the problem is fixed.
But during the boot of Ubuntu, I still
Me too:
Brightness is set to maximum after a reboot or after waking up from a
suspend.
Model: Thinkpad T440S
Ubuntu: 14.04 64 bit
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The problem is also reported on http://askubuntu.com/questions/524524
/brightness-is-reset-to-maximum-after-waking-up-from-suspend-or-lock-
screen
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I also have this issue with Thinkpad T60P.
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[Lucid] Laptop only remains DPMS off for 2 seconds
https://bugs.launchpad.net/bugs/447728
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