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  1. #1
    Join Date
    Nov 2017
    Location
    Virginia
    Posts
    1

    Angry cannot control brightness in fedora 27

    Team, cannot control my brightness. Ie the function keys do not work, gnome will not allow me to adjust the brightness & finally resolution cannot be edited.
    I suspect I need to configure something but am unsure of what. Any ideas? I mean it is not a showstopper - but still annoying. New to Fedora - digging it!
    Computer is Lenovo Yoga 910 2.70GHz i7-7500U 13.9" ---

    Here is my lspci -kvvv of the VGA

    Code:
    00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02) (prog-if 00 [VGA controller])
        Subsystem: Lenovo Device 3801
        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, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 255
        Region 0: Memory at a0000000 (64-bit, non-prefetchable) [size=16M]
        Region 2: Memory at 90000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at 4000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [40] Vendor Specific Information: Len=0c <?>
        Capabilities: [70] Express (v2) Root Complex Integrated Endpoint, MSI 00
            DevCap:    MaxPayload 128 bytes, PhantFunc 0
                ExtTag- RBE+
            DevCtl:    Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
                MaxPayload 128 bytes, MaxReadReq 128 bytes
            DevSta:    CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
            DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported
                 AtomicOpsCap: 32bit- 64bit- 128bitCAS-
            DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
                 AtomicOpsCtl: ReqEn-
        Capabilities: [ac] MSI: Enable- Count=1/1 Maskable- 64bit-
            Address: 00000000  Data: 0000
        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: [100 v1] Process Address Space ID (PASID)
            PASIDCap: Exec- Priv-, Max PASID Width: 14
            PASIDCtl: Enable- Exec- Priv-
        Capabilities: [200 v1] Address Translation Service (ATS)
            ATSCap:    Invalidate Queue Depth: 00
            ATSCtl:    Enable-, Smallest Translation Unit: 00
        Capabilities: [300 v1] Page Request Interface (PRI)
            PRICtl: Enable- Reset-
            PRISta: RF- UPRGI- Stopped+
            Page Request Capacity: 00008000, Page Request Allocation: 00000000
        Kernel modules: i915

  2. #2
    Join Date
    Feb 2005
    Location
    London, UK
    Posts
    566

    Re: cannot control brightness in fedora 27

    Does "xbacklight -inc 10" or "xbacklight -dec 10" work from the command line? If so you can link the keys to those commands with xbindkeys... that is assuming you're not running Wayland (xorg's replacement) which by default Fedora does, if you're running Wayland neither commands would work.

  3. #3
    Join Date
    Nov 2017
    Location
    USA
    Posts
    20

    Re: cannot control brightness in fedora 27

    can you post output of inxi -Fxmz?

    what cpu do you have?

    do you see any errors in dmesg from i915 driver? dmesg | grep i915

  4. #4
    Join Date
    Aug 2017
    Location
    US
    Posts
    54

    Re: cannot control brightness in fedora 27

    I tried on my laptop using F27 Live USB. Didn't have any problem.

    (Just wanted to add a data point.)

  5. #5
    Join Date
    Nov 2017
    Location
    USA
    Posts
    20

    Re: cannot control brightness in fedora 27

    Quote Originally Posted by HaydnH
    Does "xbacklight -inc 10" or "xbacklight -dec 10" work from the command line? If so you can link the keys to those commands with xbindkeys... that is assuming you're not running Wayland (xorg's replacement) which by default Fedora does, if you're running Wayland neither commands would work.
    yes, disabling Wayland in GNOME let me use xrandr to set brightness

    details in this post

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