Hi Everyone, I'm working on Ubuntu 20.04, x86_64, fully patched. It has the 5.4.0-64 kernel. The machine is a Dell XPS 8930 with an i7-8700, https://www.amazon.com/gp/product/B078N85NCR.
I'm having a power management problem. The monitor goes to sleep and does not wake up. Power Management applet settings are (a) turn monitor off after 15 minutes, and (b) never go to sleep. Moving the mouse and tapping on the keyboard does not seem to wake the monitor. In this state I can SSH into the machine. I think this issue has to do with Noveau. The problem started after I removed the original GeForce GTX 1060 (Nvidia driver) and installed a Radeon 7750 (Nouveau driver). I switched cards for the open source driver. The Radeon 7750 card is https://www.amazon.com/gp/product/B00C7EPSVS. The monitor cable is HDMI to Mini DisplayPort. It is a new cable for use with the Radeon card. https://www.amazon.com/gp/product/B00YONKZ72. I have the package xserver-xorg-video-nouveau installed. I removed all the Nvidia and purged all the packages. The logs I have found look like this (from log viewer): <finish using machine around 7:00 AM> 12:10 PM radeon_dp_aux_transfer_native: 2510 callbacks suppressed 2:00 PM radeon_dp_aux_transfer_native: 1040 callbacks suppressed <go back to work around 2:00 PM> 2:01 PM [drm:radeon_dp_link_train [radeon]] *ERROR* displayport link status failed 2:01 PM [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery failed 2:01 PM [drm:radeon_dp_link_train [radeon]] *ERROR* displayport link status failed 2:01 PM [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery failed 2:05 PM radeon_dp_aux_transfer_native: 566 callbacks suppressed <reboot machine to get monitor to work> I searched Freedesktop's GitLab issues (https://gitlab.freedesktop.org/drm/nouveau/-/issues) related to "*ERROR* displayport link status failed" and "*ERROR* clock recovery failed". GitLab did not return any hits. I noticed I was missing the nouveau-firmware package. When I added it I lost the monitor completely. The monitor displayed a message similar to "No HDMI signal present", even during a reboot. nouveau-firmware definitely made things worse. Removing nouveau-firmware did not help. The "No HDMI signal" problem persisted. I had to switch back to the GeForce card and the Nvidia driver. Does anyone have suggestions how to troubleshoot this further? $ apt-cache show xserver-xorg-video-nouveau Package: xserver-xorg-video-nouveau Architecture: amd64 Version: 1:1.0.16-1 Priority: optional Section: x11 Origin: Ubuntu Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com> Original-Maintainer: Debian X Strike Force <debia...@lists.debian.org> Bugs: https://bugs.launchpad.net/ubuntu/+filebug Installed-Size: 278 Provides: xorg-driver-video Depends: libc6 (>= 2.4), libdrm-nouveau2 (>= 2.4.38), libdrm2 (>= 2.4.61), libudev1 (>= 183), xorg-video-abi-24, xserver-xorg-core (>= 2:1.18.99.901) Recommends: libgl1-mesa-dri (>= 9.0) -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
