[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 #73 from Nikolay Amiantov <nikoamia at gmail.com> ---
I have hybrid ATI 5650/Intel Ironlake muxed system, and when I switch to
radeon, backlight stays enabled now (looks like it was fixed by patch from that
bug), but I can't change in at all, and it is down when I do suspend cycle.
lspci -vv:
...
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated
Graphics Controller (rev 18) (prog-if 00 [VGA controller])
    Subsystem: Acer Incorporated [ALI] Device 0359
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
    Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Interrupt: pin A routed to IRQ 45
    Region 0: Memory at d8000000 (64-bit, non-prefetchable) [size=4M]
    Region 2: Memory at c0000000 (64-bit, prefetchable) [size=256M]
    Region 4: I/O ports at 4050 [size=8]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Address: fee0f00c  Data: 4122
    Capabilities: [d0] Power Management version 2
        Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
        Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [a4] PCI Advanced Features
        AFCap: TP+ FLR+
        AFCtrl: FLR-
        AFStatus: TP-
    Kernel driver in use: i915
    Kernel modules: i915
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Madison [Mobility Radeon HD 5650/5750 / 6530M/6550M] (rev ff) (prog-if ff)
    !!! Unknown header type 7f
    Kernel driver in use: radeon
    Kernel modules: radeon
...
ls /sys/class/backlight:
acpi_video0  acpi_video1  intel_backlight
Neither of them work. What can I do to help tracing this bug further? Should I
open another one?

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