FS#57605 - [linux] Can't use 144Hz monitor output on 4.15.3-2 with amdgpu DC enabled
Attached to Project:
Arch Linux
Opened by Aleksei (nesk_bugs) - Thursday, 22 February 2018, 12:08 GMT
Last edited by Doug Newgard (Scimmia) - Sunday, 15 April 2018, 00:13 GMT
Opened by Aleksei (nesk_bugs) - Thursday, 22 February 2018, 12:08 GMT
Last edited by Doug Newgard (Scimmia) - Sunday, 15 April 2018, 00:13 GMT
|
Details
Description:
With DC being turned on (as it is by default) I can't set refresh rate to 144Hz. xrandr -r 144 fails with error, adding a new xrandr mode (as described in wiki) to the output fails as well. If I add amdgpu.dc=0 to kernel boot line (GRUB) - 144Hz is set successfully. xrand output with amdgpu.dc=1: DVI-D-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm 1920x1080 60.00 + 59.94* xrand output with amdgpu.dc=0: DVI-D-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm 1920x1080 60.00 + 144.00* 119.98 99.93 59.94 Additional info: * linux-4.15.3-2 * X.org GPU config attached Steps to reproduce: 1) Have a Radeon GPU and 144Hz monitor 2) Boot with stock vanilla kernel 3) Try to change refresh rate to 144Hz |
This task depends upon
Not sure what stable kernel it will end up in, looks like 4.16 - see pull request here https://lists.freedesktop.org/archives/dri-devel/2018-March/168630.html.