[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1767701
Title:
amdgpu WQHD resolution not working
Status in linux package in Ubuntu:
Expired
Bug description:
After upgrade to bionic the highest detected resolution of my monitor
was 1920x1200 instead of the 2560x1440 that it is capable of and that
worked previously.
My graphics card is a Radeon RX480 and this seems to be related to the
AMDGPU DC changes in kernel 4.15.
This is also fixed on latest 4.16.5 upstream kernel from the kernel
ppa, i.e. the maximum resolution is correctly detected without
amdgpu.dc=0 as boot parameter.
attached are the xorg files after booting the 4.15 and 4.16.5 kernels
both without amdgpu.dc=0. The main difference seems to be the probed
modes.
WORKAROUND: Pass kernel boot parameter:
amdgpu.dc=0
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