Intel Coffee Lake GPU isn't supported by default (yet)

Bug #1728313 reported by giannione on 2017-10-28
This bug affects 2 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)

Bug Description

I've got a CPU with integrated GPU, it's the intel i5-8400; I've also installed an old asus [Radeon HD 6670/7670] GPU. OS: ubuntu 17.10

The first problem is that the integrated GPU doesn't work unless you edit grub enabling the i915 driver support.
I had to modify GRUB to load the intel driver:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.alpha_support=1"

This GPU works perfectly with wayland (gnome and ubuntu session):
Turks XT [Radeon HD 6670/7670]

But when I enable the integrated GPU (by disabling the Radeon pci GPU from the bios), I can't use wayland, which disappears from the login screen.
My question is why the integrated intel GPU doesn't work with wayland: I can only use X.

If I switch from gdm3 to lightdm, I can see the wayland gnome and ubuntu sessions in the list of the available sessions, but I can't login. To be precise, using lightdm I can't login at all.

When logging, there are some errors, for example:
[OK] Starting session manager for UID 121
Stopping session manager for UID 121

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: weston (not installed)
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Sun Oct 29 00:22:36 2017
DistUpgraded: Fresh install
DistroCodename: artful
DistroVariant: ubuntu
 Intel Corporation Device [8086:3e92] (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:8694]
 Advanced Micro Devices, Inc. [AMD/ATI] Turks XT [Radeon HD 6670/7670] [1002:6758] (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Turks XT [Radeon HD 6670/7670] [1043:03f2]
InstallationDate: Installed on 2017-10-25 (3 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
MachineType: System manufacturer System Product Name
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic root=UUID=8946514c-0547-4d93-8cf6-bad6b91fa7dc ro quiet splash i915.alpha_support=1 vt.handoff=7
Renderer: Software
SourcePackage: weston
UpgradeStatus: No upgrade log present (probably fresh install) 10/18/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0419
dmi.board.asset.tag: Default string PRIME Z370-A
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0419:bd10/18/2017:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEZ370-A:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring: To be filled by O.E.M. System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.83-1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.2-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.2-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20170309-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

giannione (giannione) wrote :
giannione (giannione) on 2017-10-28
description: updated
giannione (giannione) on 2017-10-28
description: updated
Daniel van Vugt (vanvugt) wrote :

Thanks, that's a nicely detailed bug report.

The first issue you identified is just that your Intel GPU is too new for Linux kernel 4.13 so you need to set alpha_support=1. This will be fixed in Linux kernel 4.15 (coming in Ubuntu 18.04).

The second issue you describe is bug 1724732. So let's keep this bug just about the first issue.

summary: - integrated intel GPU doesn't work with wayland on ubuntu 17.10
+ Intel Coffee Lake GPU isn't supported by default (yet)
affects: weston (Ubuntu) → linux (Ubuntu)
no longer affects: wayland (Ubuntu)

This change was made by a bot.

Changed in linux (Ubuntu):
status: New → Confirmed
Changed in linux (Ubuntu):
importance: Undecided → Medium
status: Confirmed → Incomplete
status: Incomplete → Triaged
tags: added: bionic kernel-da-key
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