https://bugs.kde.org/show_bug.cgi?id=513667
Bug ID: 513667
Summary: Long delay when switching from tty to desktop kwin
session
Classification: Plasma
Product: kwin
Version First 6.5.4
Reported In:
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: core
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
I noticed that there is a long delay (sometimes 6+ seconds) when switching from
tty to regular kwin session.
Switching from desktop session to tty is fast in contrast.
I have two GPUs, one discrete (AMD Radeon 7900 XTX) to which the monitor is
connected. Another is integrated in the AMD APU (AMD Ryzen 9 7950X), which is
listed as RAPHAEL_MENDOCINO).
Here is a list of card# and renderD12#:
```
ls -l /dev/dri/by-path
total 0
lrwxrwxrwx 1 root root 8 Dec 20 21:14 pci-0000:48:00.0-card -> ../card0
lrwxrwxrwx 1 root root 13 Dec 20 21:14 pci-0000:48:00.0-render -> ../renderD128
lrwxrwxrwx 1 root root 8 Dec 20 21:14 pci-0000:5d:00.0-card -> ../card1
lrwxrwxrwx 1 root root 13 Dec 20 21:14 pci-0000:5d:00.0-render -> ../renderD129
```
```
lspci | rg VGA
48:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi
31 [Radeon RX 7900 XT/7900 XTX/7900 GRE/7900M] (rev c8)
5d:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Raphael (rev c1)
```
So as you can note, In my case
* card0 / renderD128 is 7900 XTX (active GPU)
* card1 / renderD129 is iGPU (not unused)
When switching from tty to the desktop session, I see this in kwin log:
```
sudo journalctl _SYSTEMD_USER_UNIT=plasma-kwin_wayland.service
```
Dec 21 13:11:02 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/renderD128 device (No such device)
Dec 21 13:11:02 host kwin_wayland_wrapper[2588]: kwin_wayland_drm: Failed to
open drm device /dev/dri/renderD128
Dec 21 13:11:02 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:02 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:02 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:02 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:02 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:02 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:02 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:03 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:03 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:03 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:03 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:03 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:03 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:03 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:03 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:03 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:03 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:04 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:04 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:04 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:04 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:04 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:04 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:04 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:04 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:04 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:04 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:05 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:05 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:05 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:05 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:05 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:05 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:05 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:05 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:05 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:05 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:06 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:06 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:06 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:06 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:06 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:06 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:06 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:06 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:06 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:06 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:07 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:07 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:07 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:07 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/card1 device (Device or resource busy)
Dec 21 13:11:07 host kwin_wayland_wrapper[2588]: kwin_wayland_drm: Failed to
open drm device /dev/dri/card1
Dec 21 13:11:07 host kwin_wayland_wrapper[2588]: kwin_core: Failed to open
/dev/dri/renderD129 device (No such device)
Dec 21 13:11:07 host kwin_wayland_wrapper[2588]: kwin_wayland_drm: Failed to
open drm device /dev/dri/renderD129
```
Note how it's trying to open the device for unused GPU for more than 5 seconds.
That's directly corresponds to the delay that I'm observing when switching from
tty.
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