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trying to open device 'i915'...failed

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jason fan's picture
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jason fan

Nov 30, 2015 - 08:37am

  • hi,

        I have compiled kernel4.2, which been intalled on skylake.when i run the modetest in libdrm,some error occurred:

               trying to open device 'i915'...faile

        In addition,There is nothing in /dev/dri/ directory. 

       what's the reason? 

    Nov 30, 2015 - 08:37am
  • Is the i915.ko module loaded?

    lsmod | grep i915

    Does it support your graphics hardware?

    pciid=$(lspci -vnn | grep VGA | sed -re 's/^.*(8086):(....).*/v0000\1d0000\2sv/');
    modinfo i915 | grep -iF $pciid

    You may need to load the i915 driver with the preliminary_hw_support parameter set to 1
    to get skylake support.

    You can do this either from the kernel command line (i915.preliminary_hw_support=1)
    or by putting an entry in /etc/modprobe.d/local-i915.conf:

    options i915 preliminary_hw_support=1

    Dec 01, 2015 - 10:32am