11 thoughts on - Support For Intel Graphics 605 UHD

• Ok – I went back to CentOS 7. In the same box. CentOS 7 has this same file:
  Section “Device”
  Identifier “Intel Graphics”
  Driver “intel”
  EndSection

  /var/log/Xorg.0.log has the Driver being Intel i915 version 1.6.0

  but in CentOS 8 – it does not work and uses the generic driver.

  Thoughts?

  Jerry

• 1. What does lspci say you have (in EL7 and EL8)
  2. What does the kernel say in journalctl or /var/log/messages with respect to what is detected
  3. Do you have xorg-x11-drv-intel and/or intel-gpu-tools installed

• C7: lspci | grep VGA

  00:02.0 VGA compatible controller: Intel Corporation Device 3185 (rev 03)
  grep Driver /var/log/Xorg.0.log
  [ 24.374] (**) | |–>Device “Intel Graphics”
  [ 24.610] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
  [ 24.614] (II) intel: Driver for Intel(R) HD Graphics
  [ 24.614] (II) intel: Driver for Intel(R) Iris(TM) Graphics
  [ 24.614] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics
  [ 24.904] (II) config/udev: Adding input device HDA Intel PCH Line Out
  (/dev/input/event10)
  [ 24.905] (II) config/udev: Adding input device HDA Intel PCH Front Headphone (/dev/input/event11)
  [ 24.906] (II) config/udev: Adding input device HDA Intel PCH
  HDMI/DP,pcm=3 (/dev/input/event12)
  [ 24.907] (II) config/udev: Adding input device HDA Intel PCH
  HDMI/DP,pcm=7 (/dev/input/event13)
  [ 24.908] (II) config/udev: Adding input device HDA Intel PCH
  HDMI/DP,pcm=8 (/dev/input/event14)
  [ 24.909] (II) config/udev: Adding input device HDA Intel PCH
  HDMI/DP,pcm=9 (/dev/input/event15)
  [ 24.910] (II) config/udev: Adding input device HDA Intel PCH
  HDMI/DP,pcm (/dev/input/event16)
  [ 24.910] (II) config/udev: Adding input device HDA Intel PCH Mic
  (/dev/input/event9)

  C8
  lspci | grep VGA
  00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 605 (rev
  03)

  grep Driver /var/log/Xorg.0.log
  [ 38.654] X.Org Video Driver: 24.0
  [ 38.664] Module class: X.Org Video Driver
  [ 38.664] ABI class: X.Org Video Driver, version 24.0
  [ 38.664] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
  [ 38.665] (II) intel: Driver for Intel(R) HD Graphics
  [ 38.665] (II) intel: Driver for Intel(R) Iris(TM) Graphics
  [ 38.665] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics

  In C8 /var/log/messages I see messages about “no i915.ko binding for Intel codec”.

  Yes xorg-x11-drv-intel is loaded on C8 and C7.

  Jerry

• Hmmm looking at the kernel modules they should be in a directory like:

  /lib/modules/4.18.0-147.0.3.el8_1.x86_64/kernel/drivers/gpu/drm/i915/gvt/kvmgt.ko.xz
  /lib/modules/4.18.0-147.0.3.el8_1.x86_64/kernel/drivers/gpu/drm/i915/i915.ko.xz
  /lib/modules/4.18.0-147.3.1.el8_1.x86_64/kernel/drivers/gpu/drm/i915/gvt/kvmgt.ko.xz
  /lib/modules/4.18.0-147.3.1.el8_1.x86_64/kernel/drivers/gpu/drm/i915/i915.ko.xz
  /lib/modules/4.18.0-147.el8.x86_64/kernel/drivers/gpu/drm/i915/gvt/kvmgt.ko.xz
  /lib/modules/4.18.0-147.el8.x86_64/kernel/drivers/gpu/drm/i915/i915.ko.xz

  see if they exist on your system and if they do try an insmod with the kernel you are using. If that works then it is a matter of figuring out why its not finding the modules. If it doesn’t exist.. it is a matter of finding out why

• Thanks here is the kernel I’m running on C8 and the files listing.

  4.18.0-147.5.1.el8_1.x86_64 #1 SMP Wed Feb 5 02:00:39 UTC 2020 x86_64
  x86_64 x86_64 GNU/Linux

  ./4.18.0-147.el8.x86_64/kernel/drivers/gpu/drm/i915
  ./4.18.0-147.el8.x86_64/kernel/drivers/gpu/drm/i915/i915.ko.xz
  ./4.18.0-147.el8.x86_64/kernel/drivers/gpu/drm/i915/gvt
  ./4.18.0-147.el8.x86_64/kernel/drivers/gpu/drm/i915/gvt/kvmgt.ko.xz
  ./4.18.0-147.5.1.el8_1.x86_64/kernel/drivers/gpu/drm/i915
  ./4.18.0-147.5.1.el8_1.x86_64/kernel/drivers/gpu/drm/i915/i915.ko.xz
  ./4.18.0-147.5.1.el8_1.x86_64/kernel/drivers/gpu/drm/i915/gvt
  ./4.18.0-147.5.1.el8_1.x86_64/kernel/drivers/gpu/drm/i915/gvt/kvmgt.ko.xz

  insmod i915 and insmod i915.ko both say no file found.

  modprobe i915 does work. that is weird.

  jerry

• Am 05.03.20 um 18:30 schrieb Jerry Geis:

  Whats the output of “cat /proc/cmdline” …

• This is my /proc/cmdline

  BOOT_IMAGE=(hd0,gpt2)/boot/vmlinuz-4.18.0-147.5.1.el8_1.x86_64
  root=UUID

• Am 06.03.20 um 15:23 schrieb Jerry Geis:

  Mmmh, are you using a dual graphics platform?

  Just a wild guess; substitute your grub config part

  blacklist=nouveau nomodeset nouveau.modeset=0

  with

  module_blacklist=nouveau,amdgpu,radeon i915.alpha_support=1

  Install the new grub config and rebuild your init ramdisk, just for consistency …

• ok I did that – regen that file and verified with cat /proc/cmdline This is not a dual monitor situation. I also removed all that other
  “legacy” stuff I had in there.

  no difference.

  Jerry

• Those settings aren’t typically for a dual-monitor setup specifically, but for enabling the 3rd-party NVidia or AMD drivers, instead of the open source, in-kernel drivers.

  If you are only using an intel GPU, you don’t need them.

• Ok so I re-installed CentOS 8 from scratch. and compared the two. C7 and C8
  X log files. As 7 loaded Intel drivers and 8 does not.

  grep LoadModule Xorg.0.log on CentOS 7
  [ 22.856] (II) LoadModule: “glx”
  [ 22.863] (II) LoadModule: “intel”
  [ 22.878] (II) LoadModule: “dri3”
  [ 22.878] (II) LoadModule: “dri2”
  [ 22.878] (II) LoadModule: “present”
  [ 23.054] (II) LoadModule: “evdev”
  Clearly loading the intel driver… Good.

  grep LoadModule Xorg.0.log on CentOS 8
  [ 12.792] (II) LoadModule: “glx”
  [ 12.804] (II) LoadModule: “modesetting”
  [ 12.812] (II) LoadModule: “fbdev”
  [ 12.813] (II) LoadModule: “vesa”
  [ 12.835] (II) LoadModule: “fbdevhw”
  [ 12.839] (II) LoadModule: “glamoregl”
  [ 13.120] (II) LoadModule: “fb”
  [ 13.726] (II) LoadModule: “libinput”
  Not loading the intel driver – bad

  What should I look at to find out why ?

  My Kernel 4.18.0-147.5.1.el8_1.x86_64

  rpm -qa | grep -i intel xorg-x11-drv-intel-2.99.917-38.20180618.el8.x86_64

  Jerry