Independent confirmation on different Intel hardware.
Environment:
- Ubuntu 24.04.5 LTS
- X11, Plasma 5.27.12, kwin-x11 5.27.11
- Mesa 25.2.8-0ubuntu0.24.04.2
- kernel 7.0.0-30-generic
- Intel Raptor Lake-P Iris Xe [8086:a7a0]
Observed failure:
During ordinary idle desktop use and once around a display-power transition,
the displayed frame stopped updating while the hardware cursor continued to
move. Applications and the rest of the system continued running. Xorg remained
responsive, while KWin D-Bus `supportInformation` timed out. Restarting only
`kwin_x11` restored the desktop.
I captured a core remotely before switching to a VT. The relevant
blocked part of the main `kwin_x11` thread is:
xcb_wait_for_special_event
libgallium-25.2.8-0ubuntu0.24.04.2.so
loader_dri3_query_buffer_age
libGLX_mesa.so.0
KWin::Compositor::composite
KWin::X11Compositor::composite
KWin::RenderLoop::frameRequested
KWin::RenderLoopPrivate::dispatch
This independently reproduces the blocking
`loader_dri3_query_buffer_age` path from comment #3, now on Raptor
Lake-P and kernel 7.0.0-30. Memory, CPU, and I/O pressure were zero at
capture time; restarting KWin alone was sufficient.
I have applied `KWIN_USE_BUFFER_AGE=0` to KWin as a targeted workaround
and will report if the freeze recurs. Hardware OpenGL compositing
remains enabled.
Please evaluate/backport Mesa commit
`0a0ee06c527f29a6f7cc39f55ad169a0037d2c11` ("dri3: Increment
draw->send_sbc after waiting for last presentation") to Noble's Mesa
25.2.x.
No core is attached because it may contain private application memory;
the relevant stack is included above.
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https://bugs.launchpad.net/bugs/2161079
Title:
kwin_x11 and plasmashell hang forever in DRI3 glXSwapBuffers after HWE
kernel 6.17 update (Meteor Lake, X11) — fix candidate in Mesa 26.1.5
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