[Bug 88501] New: AMD/ATI RS690M Console blanks to white

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

            Bug ID: 88501
           Summary: AMD/ATI RS690M Console blanks to white
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.6.0-rc5 to 3.18.0-rc4
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: business.kid at gmail.com
        Regression: Yes

Created attachment 158181
  --> https://bugzilla.kernel.org/attachment.cgi?id=158181&action=edit
Git Bisect log, & git visualise o/p

Without X running, linux consoles blank after a period adjustable by setterm.
Mine does not. It goes white. If I invert the screen colours, it goes whiter.
Backlight?
I cloned the Linus-stable git and tried it. 3.18.0-rc4 twists this slightly -
The FIRST time the screen blanks, it does so correctly; every other time, it
blanks to white. 
I'm a hardware guy, not a software expert. Git bisect gives the output below.
Details of the box also attached

The box is a HP 6715S, twin core Turion, 3G ram. It's running Slackware-current
as of Sept 30th, 2014. LSPCI output attached. Bios Version: ATI 02/13/08,1.

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