[Bug 55311] Since 3.7.1-17.1 radeon has no backlight when using vgaswitcheroo (regression)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=55311

--- Comment #70 from jimis hol <hol.jimis at gmail.com> ---
I dont know id it is relevant but i get these warnings by dmesg
[    2.020262] ACPI Warning: \_SB_.PCI0.GFX0._DSM: Argument #4 type mismatch -
Found [Integer], ACPI requires [Package] (20130517/nsarguments-95)
[    2.020345] ACPI Warning: \_SB_.PCI0.GFX0._DSM: Argument #4 type mismatch -
Found [Integer], ACPI requires [Package] (20130517/nsarguments-95)
[    3.258350] ACPI Warning: 0x0000000000004000-0x000000000000401f SystemIO
conflicts with Region \_SB_.PCI0.SBUS.SMBI 1 (20130517/utaddress-251)

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