Public bug reported:
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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amdgpu
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https://bugs.launchpad.net/bugs/1761825
Title:
amdgpu.dc fails on AMD (Kaveri) A10-7300
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