Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.16 kernel[0].
If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16 ** Changed in: linux (Ubuntu) Importance: Undecided => Medium -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1761825 Title: amdgpu.dc fails on AMD (Kaveri) A10-7300 Status in linux package in Ubuntu: Incomplete Bug description: Booting kernel 4.16 ( BOOT_IMAGE=/vmlinuz-4.16.0-041600-generic ) with external monitor attached to VGA port of Lenovo Ideapad Z50-75 (AMD Kaveri A10-7300) results in blank external display when amdgpu.ci_support is forced (i.e. radeon disabled). key dmesg messages are: [ 1.897177] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:3! type 0 expected 3 [ 1.897266] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:4! type 0 expected 3 [ 1.897380] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:5! type 0 expected 3 [ 1.897489] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:6! type 0 expected 3 Kernel boot options are: amdgpu.cik_support=1 radeon.cik_support=0 If I boot the same kernel with the following options: amdgpu.cik_support=1 radeon.cik_support=0 amdgpu.dc=0 The VGA attached display works. Attached in the tar are: version.log - output of cat /proc/version lspci-vnvn.log - output of sudo lscpi -vnvn dmesg_amdgpu.dc-(default-one) - dmesg from boot with amdgpu.cik_support forced and amdgpu.dc left to deafult dmesg_amdgpu.dc-0 - dmesg from boot with amdgpu.cik_support forced and amdgpu.dc disabled --- ApportVersion: 2.20.1-0ubuntu2.15 Architecture: amd64 CurrentDesktop: LXDE DistroRelease: Ubuntu 16.04 InstallationDate: Installed on 2017-09-05 (213 days ago) InstallationMedia: Lubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801) JournalErrors: Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] failed with exit code 1: Failed to search journal ACL: Operation not supported No journal files were opened due to insufficient permissions. Package: linux (not installed) Tags: xenial Uname: Linux 4.16.0-041600-generic x86_64 UnreportableReason: The running kernel is not an Ubuntu kernel UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip kismet libvirtd lpadmin plugdev sambashare scanner sudo _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1761825/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
