| 31 May 2026 |
|  Aliaksandr set a profile picture. | 00:31:03 |
 aktaboot | I'm hitting an issue that seems to be kwin related but i'm not 100% positive.
Sometimes my external monitor just doesnt seem to receive any signal and i get kwin_wayland[2815]: Failed to open drm device in the kwin logs
- the monitor goes to sleep after initially getting woken
- I see the monitor in Display Configuration and can enable/disable it etc.
- If I switch to a different tty, it does wake up and mirror the other monitor, as expected
- kernel logs dont show any warnings relating to drm or amdgpu
Any ideas how i can debug this further? | 06:19:32 |
 K900 | Is it a separate GPU or just wired to the integrated? | 06:20:14 |
| aktaboot | the issue either happens initially or doesn't (only reboot fixes it it seems) | 06:20:17 |
| aktaboot | integrated | 06:20:27 |
| K900 | Does kscreen-doctor list it when it's dead? | 06:20:28 |
| aktaboot | yeah i can enable it with kscreen doctor and everything | 06:20:50 |
| K900 | The "failed to open drm device" is probably a red herring then | 06:20:52 |
| K900 | But still no signal even if it's reenabled? | 06:21:05 |
| aktaboot | yeah ... | 06:21:11 |
| K900 | Try a different cable? | 06:21:24 |
| K900 | It could just be failing to negotiate the link settings properly | 06:21:31 |
| K900 | Actually, also, HDMI or DP? | 06:21:37 |
| aktaboot | DP! but also through a Dock | 06:22:29 |
| K900 | Try a direct connection? | 06:22:43 |
| aktaboot | direct connection works | 06:22:49 |
| K900 | Always? | 06:23:00 |
| aktaboot | and different cable doesnt change much | 06:23:06 |
| K900 | Yeah that makes sense if it's a dock and also DP | 06:23:14 |
| K900 | Is it a Thunderbolt/USB4 dock or USB3? | 06:23:27 |
| aktaboot | yeah it seems to always work | 06:23:34 |
| aktaboot | not entirely sure but Ig USB3 | 06:23:52 |
| aktaboot | never had the issue until very recently though | 06:24:06 |
| aktaboot | my setup didnt change | 06:24:18 |
| aktaboot | USB3.1! | 06:24:48 |
| aktaboot | Bus 007 Device 024: ID 17ef:a392 Lenovo USB2.0 Hub
Bus 007 Device 026: ID 17ef:a394 Lenovo USB2.0 Hub
Bus 007 Device 027: ID 17ef:a395 Lenovo USB2.0 Hub
Bus 008 Device 013: ID 17ef:a391 Lenovo USB3.1 Hub
Bus 008 Device 015: ID 17ef:a393 Lenovo USB3.1 Hub
| 06:25:31 |
| K900 | That's not a very accurate way tbh | 06:25:58 |
| K900 | But I'm guessing it's not TB | 06:26:45 |
| K900 | Because there's like | 06:26:51 |
| aktaboot | yeah i'm pretty sure it's not | 06:26:55 |
