Chrome Version: 61.0.3144.0 (Official Build) dev (64-bit)
Chrome OS Version: Google_Swanky.5216.238.5
Chrome OS Platform: 9693.1.0 (Official Build) dev-channel swanky
Network info: na

Please specify Cr-* of the system to which this bug/feature applies (add
the label below).

Toshiba CB35-B3340

1. Brightness buttons don't work
2. Report feedback  form doesn't respond to Send or Cancel clicks.
3. On first reboot after update the screen is black. Only fixed but plugging in external monitor. Now screen comes on without need for external.

Steps To Reproduce:
(1) update a TCB2 to dev
(2)
(3)

Expected Result:

Actual Result:

How frequently does this problem reproduce? Always

What is the impact to the user, and is there a workaround? If so, what is
it? Brightness keys no work around, black screen work around is extrenal monitor once.

Please provide any additional information below. Attach a screen shot or
log if possible.

For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.