I confirm this issue on Ubuntu 20.04 LTS; Nvidia driver 440.100; Linux kernel 5.4.0-42-lowlatency; GeForce 1060 6GB Two monitors: LG 27GL850 (144Hz DP connection) and Asus VG248 (60 Hz single-link DVI connection, despite display could more) If the second (slow) display is connected "effective" refresh rate on first (fast) display is limited to 60 Hz. I mean effective, despite xrandr shows 140, actual window moving traces, effects in 3D games are similar to 60 Hz, and testufo.com also shows 60Hz. If I disable slow display in nvidia-settings, effective refresh rate (window moving, games) are smooth as supposed to be, and ufotest shows 144 Hz and smooth ufo moving. I remember that there were no such issues with some previous version of nvidia driver (3xx)
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-amdgpu in Ubuntu. https://bugs.launchpad.net/bugs/1820832 Title: [xorg] multiple monitors: limits the framerate of faster 120/144hz monitors to 60hz Status in nvidia-graphics-drivers-418 package in Ubuntu: Confirmed Status in xserver-xorg-video-amdgpu package in Ubuntu: Confirmed Bug description: multiple monitors on xorg ============================= Was recently discussed over on https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1763892 Another user + myself have the following issue: The slowest connected display limits the FPS. The test case we used is over at the top of the other bug report ^^ This we found today happens with either amd vega graphics, or nvidia pascal graphics, the vendor doesn't seem to matter. We have both seen the same issue (xorg). This is on 18.10, and booting into the 'Gnome (xorg)' login option. With the FPS being logged by journalctl -f. With only single monitor attached. Then it initially goes as high as the primary monitor can show. (And glmark2 running in background, to maintain a continued load). Which is 120fps for my case. Then as soon as secondary monitor is plugged in, which is a 60hz TV. This is being plugged into the HDMI port of the same graphics card in real time. Then the FPS logged by 'journalctl -f' drops, and becomes capped to 60hz, in the output being printed by journalctl -f. My setup: kernel 5.0.0-050000-lowlatency #201903032031 NVIDIA Driver for UNIX platforms 415.27 (the closed source one) ubuntu 18.10 mutter version: mutter/cosmic-updates,now 3.30.2-1~ubuntu18.10.4 amd64 [installed] mutter-common/cosmic-updates,cosmic-updates,now 3.30.2-1~ubuntu18.10.4 all [installed] To confirm where the '.4' at the very end of the ~ubuntu18.10.4 version number, it seems to be that we have updated now on our client machines the be most recent bugfix updates, kindly provided by Daniel. Which closed the other bug https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1763892 being referred to, as being solved for people's single monitor scenarios. Thanks again for the other recent bug fixes in this area, it is a nice progress. Very helpful! We hope you can also look into this latest problem / issue for the multiple monitor scenario. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-418/+bug/1820832/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
