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Ubuntu Studio 16.04 on Lenovo T520 laptop.
I installed (Panel App -> Panel -> Install New Items) the Notes panel app.
After doing so (and continuing after I removed it) I'm now getting this sort of
error in dmesg:
[64397.223784] WARNING: CPU: 2 PID: 3000 at
/build/linux-5vkMGy/linux-4.4.0/drivers/gpu/drm/drm_irq.c:1326
drm_wait_one_vblank+0x1b0/0x1c0 [drm]()
[64397.223785] vblank wait timed out on crtc 0
The user-visible symptom is that many apps (Firefox, Thunderbird, LibreOffice)
now hang upon launch.
If I poke around in the process tree, all apps are waiting on a subprocess.
Killing the subprocess will bring up the app.
Running strace on the processes, the hanging subprocesses have this in common:
* opening /etc/drirc for read
* checking for the existence of ~/.drirc (it doesn't exist)
* a syscall writing to some handle that ends up hanging, e.g.
ioctl(5, DRM_IOCTL_I915_GEM_CREATE, 0x7ffd90290680) = 0
ioctl(5, _IOC(_IOC_READ|_IOC_WRITE, 0x64, 0x5e, 0x28), 0x7ffd90290630) = 0
ioctl(5, DRM_IOCTL_I915_GEM_SET_DOMAIN, 0x7ffd90290630) = 0
ioctl(5, DRM_IOCTL_I915_GEM_SET_DOMAIN <unfinished ...>
I've attached a larger fragment from dmesg.
** Affects: xfce4 (Ubuntu)
Importance: Undecided
Status: New
** Tags: hang opengl process
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"vblank wait timed out" triggered by Notes (panel app) install
https://bugs.launchpad.net/bugs/1617003
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