| Bug ID | 106427 |
|---|---|
| Summary | RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup |
| Product | DRI |
| Version | unspecified |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/AMDgpu |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | txtoxtox285@googlemail.com |
Kernel: 4.16.7 My monitor’s native mode is (some variant of) 5120x2880 at 60Hz. When amdgpu is loaded during startup, it picks up this mode from the monitor and switches to it just fine. However, when I start a minimal X (X.Org X server 1.19.5, amdgpu 1.3.0) without /etc/X11/xorg.conf and just an xterm and no window manager, I can see the for a fraction of a second the xterm window in the upper left corner of the screen before the monitor turns black. It’s not turned off, the monitor’s power LED shows that it’s on. When I try to switch to another Linux console with Alt+Tab+F6, nothing happens; the console is not switched (I can verify this because typing “echo -en '\a'” doesn’t beep). After ca. 1:30 min the console finally *is* switched but remains black. The kernel spews out messages about timeouts, and I have to reboot the machine (from ssh or Ctrl+Alt+Del). I can use X with 5K if I restrict the refresh rate to 30 Hz (from “cvt 5120 2880 30”). This bug is present since kernel 4.15.10 or thereabouts, which was the first version where amdgpu would work with dc = 1.
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