[Bug 88071] New: Screen stays off if DPMS is set to off and then on again

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=88071

            Bug ID: 88071
           Summary: Screen stays off if DPMS is set to off and then on
                    again
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.18-rc3
          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

If the screen is on and I run "xset dpms force off", I have to manually set
bl_power to 0 in order to turn the screen on again.

Here some data I collected.

* If the screen is off and set dpms to off, I get:
cat /sys/class/drm/card0/card0-DP-1/dpms
On
cat /sys/class/drm/card0/card0-eDP-1/dpms
Off
cat /sys/class/backlight/intel_backlight/bl_power
4
cat /sys/class/backlight/intel_backlight/brightness
0

* If I try to turn the screen on by pressing any key, I get:
cat /sys/class/drm/card0/card0-DP-1/dpms
On
cat /sys/class/drm/card0/card0-eDP-1/dpms
On
cat /sys/class/backlight/intel_backlight/bl_power
1
cat /sys/class/backlight/intel_backlight/brightness
94

* At this point, to turn the screen on, I have to toggle bl_power.


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

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