https://bugzilla.kernel.org/show_bug.cgi?id=201139
Bug ID: 201139 Summary: amdgpu: [drm] enabling link 1 failed: 15 (vega) Product: Drivers Version: 2.5 Kernel Version: 4.19-rc3 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: mezin.alexander@gmail.com Regression: No
My setup: - RX Vega 64 - Arch Linux - GNOME 3.28.3 on Xorg 1.20.1 - modesetting Xorg driver - LG 27UD69P and Dell P2415Q
I have "screen blanking" enabled in Gnome. Sometimes (very rarely) one display (Dell, connected to 2nd DisplayPort) doesn't wake up correctly. It turns on, shows only black screen, then quickly shows "no signal" message. In kernel log I see:
[39215.008773] [drm] enabling link 1 failed: 15
If I manually turn the display off and on, it starts to work.
Can't tell if it is a regression (hardly it is) because on 4.18 and earlier screen blanking just makes the driver hang: https://bugzilla.kernel.org/show_bug.cgi?id=200531
I've never seen a similar issue on Windows on the same machine. If I'm not mistaken, I've seen the same issue with Gnome on Wayland too (but I'm not sure).