Moving to *u*v view in Vectorscope causes Darktable to hang

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

When running Linux Mint 22.3 Zena/Ubuntu 24.04 noble, Darktable hangs when viewing uv view in vectorscope.

Steps to reproduce

Click 'set view to ...' in vectorscope.

Expected behavior

Should cycle round to the next vectorscope view (but it doesn't get there, so can't say waht it is!)

Logfile | Screenshot | Screencast

No response

Commit

5.6_1.1_106

Where did you obtain darktable from?

darktable.org / GitHub release

darktable version

5.6_1.1_106

What OS are you using?

Linux Mint

What is the version of your OS?

Linux Mint 22.3 Zena/Ubuntu 24.04 noble

Describe your system

System:
Host: xx Kernel: 6.8.0-136-generic arch: x86_64 bits: 64
Desktop: Cinnamon v: 6.6.7 Distro: Linux Mint 22.3 Zena
Machine:
Type: Laptop System: TongFang product: GX5MRXL v: Standard
serial:
Mobo: TongFang model: GX5MRXL v: Standard serial:
UEFI: American Megatrends LLC. v: N.1.10PCS05 date: 10/24/2024
CPU:
Info: 16-core (6-mt/10-st) model: Intel Core Ultra 7 155H bits: 64
type: MST AMCP cache: L2: 18 MiB
Speed (MHz): avg: 448 min/max: 400/4500:4800:3800:2500 cores: 1: 400
2: 400 3: 400 4: 400 5: 400 6: 1464 7: 400 8: 400 9: 400 10: 400 11: 400
12: 400 13: 400 14: 400 15: 400 16: 400 17: 400 18: 400 19: 400 20: 400
21: 400 22: 400
Graphics:
Device-1: Intel Meteor Lake-P [Intel Arc Graphics] driver: i915 v: kernel
Device-2: Kingcome FHD WebCam driver: uvcvideo type: USB
Display: x11 server: X.Org v: 21.1.11 with: Xwayland v: 23.2.6 driver: X:
loaded: modesetting unloaded: fbdev,vesa dri: iris gpu: i915 resolution:
1: 1920x1080 2: N/A
API: EGL v: 1.5 drivers: iris,swrast platforms: gbm,x11,surfaceless,device
API: OpenGL v: 4.6 compat-v: 4.5 vendor: intel mesa
v: 25.2.8-0ubuntu0.24.04.2 renderer: Mesa Intel Arc Graphics (MTL)
API: Vulkan v: 1.3.275 drivers: N/A surfaces: xcb,xlib

Are you using OpenCL GPU in darktable?

Should be.

If yes, what is the GPU card and driver?

Intel Corporation Meteor Lake-P [Intel Arc Graphics] (rev 08)

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

By default I'm stuck in vectorscope RGB view.
Can switch to 'waveform' and 'RGB parade' views, but movement within vectorscope isn't possible.

Reproduce the hang from the vectorscope “set view to ...” control on the reported Linux Mint/Ubuntu setup, noting that waveform and RGB parade views still work. Start by tracing the vectorscope view-switching entry point and compare it with the working view changes; done means cycling from RGB to uv no longer hangs and reaches the next view.