[Powerdevil] [Bug 354250] "Switch User" sometimes sends computer to Standby

[Oliver Henshaw via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354250

--- Comment #26 from Oliver Henshaw <oliver.henshaw at gmail.com> ---
(In reply to Martin Gräßlin from comment #24)
> From comment @18 it looks like X freezes while being on the inactive
> session. As Fedora is mentioned I assume it's an X not run as root? If X
> freezes all xcb requests are going to block. From client side there is
> nothing which can be done about that. There is no timeout and no way to
> cancel.

Yep, it's xorg-x11-server-Xorg-1.17.4-1.fc22.x86_64 with the server running as
non-root.

> 
> I would be interested in seeing a backtrace of X at that time as I assume
> it's also frozen.

# pstack 19966
Thread 2 (Thread 0x7f133d647700 (LWP 19995)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f13401db6da in cnd_wait (mtx=0x27ce4b0, cond=0x27ce4d8) at
../../../../../include/c11/threads_posix.h:154
#2  pipe_semaphore_wait (sema=0x27ce4b0) at
../../../../../src/gallium/auxiliary/os/os_thread.h:259
#3  radeon_drm_cs_emit_ioctl (param=param at entry=0x27ce180) at
radeon_drm_winsys.c:636
#4  0x00007f13401dae37 in impl_thrd_routine (p=<optimized out>) at
../../../../../include/c11/threads_posix.h:87
#5  0x00007f134963d555 in start_thread (arg=0x7f133d647700) at
pthread_create.c:333
#6  0x00007f1349955ded in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
Thread 1 (Thread 0x7f134be499c0 (LWP 19966)):
#0  0x00007f134994c2e3 in select () at ../sysdeps/unix/syscall-template.S:81
#1  0x00000000005935af in WaitForSomething
(pClientsReady=pClientsReady at entry=0x2aa4530) at WaitFor.c:227
#2  0x000000000043a3e1 in Dispatch () at dispatch.c:358
#3  0x000000000043e6eb in dix_main (argc=14, argv=0x7fff89842b38,
envp=<optimized out>) at main.c:298
#4  0x00007f1349873700 in __libc_start_main (main=0x428ae0 <main>, argc=14,
argv=0x7fff89842b38, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fff89842b28) at libc-start.c:289
#5  0x0000000000428b19 in _start ()

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