https://bugzilla.kernel.org/show_bug.cgi?id=21212

           Summary: ATI Radeon HD 5850 low brightness when acpi enabled
           Product: ACPI
           Version: 2.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Video
        AssignedTo: acpi_power-vi...@kernel-bugs.osdl.org
        ReportedBy: li...@hotmail.fr
        Regression: No


On my HP Envy 17, with ATI Radeon HD 5850, using kernels >= 2.6.34, every boot
time the screen brightness goes to 0 when the acpi is enabled.

The only way to fix it is setting acpi=off. 
After many tests, this bug seems to me not dependent of any kind of graphics
modules activated on the kernel, in fact it appears always.

This bug affects also all distribution kernels, like Ubuntu, Fedora, Gentoo,
etc..

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