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/v4.17-rc3 ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: New => Incomplete -- 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/1767701 Title: amdgpu WQHD resolution not working Status in linux package in Ubuntu: Incomplete 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. Passing amdgpu.dc=0 as boot parameter fixes the issue and the correct resolution is detected. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1767701/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
