[Bug 83021] New: Brightness is automatically set to zero when switching from X session to tty

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=83021

            Bug ID: 83021
           Summary: Brightness is automatically set to zero when switching
                    from X session to tty
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.17-rc1
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: gabriele.mzt at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Switching from my X session to tty* sets actual_screen backlight to 0 even
though brightness is not changed and is equal to max_brightness. Writing again
the value of max_brightness to brightness immediately raises the screen
backlight to the right value.
On boot, the brightness is correct until an X session is started.

The cause is 6dda730e55f412a6dfb181cae6784822ba463847 (drm/i915: respect the
VBT minimum backlight brightness), reverting it fixes the problem.

lspci:
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 09)

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