*** This bug is a duplicate of bug 1735594 ***
https://bugs.launchpad.net/bugs/1735594
Answers:
Do you have an additional monitor connected? NO What is the display resolution
you use? 12??X800 Do things still crash if you change the resolution to
something smaller than the native NO
Thank you for your direction. In attempt to narrow the failure down I examined
the two visible symptoms:
1. Mouse-over the launcher causes the launcher and the task line at the top to
disappear
2. There appears to be a recovery time of 10 to 30 seconds and then the
launcher and all reappear
The most likely culprits appear to be:
1. Mouse software; I assume that is part of the Lunux kernel. I was unable to
find any information on the Ubuntu software stack or architecture so I could
not identify the process(es) used for the mouse.
To evaluate mouse malfunction I (a) tried both the laptop’s mouse-pad and a USB
mouse with no difference in behavior and (b) did a mouse-over of some Linux
apps where the button or widget reacts to a mouse-over; the mouse-over behavior
worked as expected.
My conclusion is that the mouse and the mouse code is behaving properly.
2. Launcher code; without a software stack the name of the process is
unknowable. Doing a query in the System Monitor gave a likely
“api-spi-bus-launcher” (see that attached image, “Launcher properties
2018-01-09 12-44-12.png”).
An strace on that pid
sudo strace -p 1488 -b execve -o launcher.txt
[sudo] password for bruce:
yielded
restart_syscall(<... resuming interrupted poll ...>) = 1
read(3, "\2\0\0\0\0\0\0\0", 16) = 8
poll([{fd=3, events=POLLIN}, {fd=5, events=POLLIN}], 2, -1) = 1 ([{fd=3,
revents=POLLIN}])
read(3, "\2\0\0\0\0\0\0\0", 16) = 8
poll([{fd=3, events=POLLIN}, {fd=5, events=POLLIN}], 2, -1) = 1 ([{fd=3,
revents=POLLIN}])
read(3, "\2\0\0\0\0\0\0\0", 16) = 8
poll([{fd=3, events=POLLIN}, {fd=5, events=POLLIN}], 2, -1
I do not know how to read strace output. The “restart_syscall” line looks
suspiciously like an error recover execution.
The launcher disappearance behavior is captured in two images, before the
failure “Launcher failure a 2018-01-09 12-23-23.png” and during recovery
“Launcher failure b 2018-01-09 12-24-39.png”. They are
attached.?field.comment=Answers:
Do you have an additional monitor connected? NO What is the display resolution
you use? 12??X800 Do things still crash if you change the resolution to
something smaller than the native NO
Thank you for your direction. In attempt to narrow the failure down I examined
the two visible symptoms:
1. Mouse-over the launcher causes the launcher and the task line at the top to
disappear
2. There appears to be a recovery time of 10 to 30 seconds and then the
launcher and all reappear
The most likely culprits appear to be:
1. Mouse software; I assume that is part of the Lunux kernel. I was unable to
find any information on the Ubuntu software stack or architecture so I could
not identify the process(es) used for the mouse.
To evaluate mouse malfunction I (a) tried both the laptop’s mouse-pad and a USB
mouse with no difference in behavior and (b) did a mouse-over of some Linux
apps where the button or widget reacts to a mouse-over; the mouse-over behavior
worked as expected.
My conclusion is that the mouse and the mouse code is behaving properly.
2. Launcher code; without a software stack the name of the process is
unknowable. Doing a query in the System Monitor gave a likely
“api-spi-bus-launcher” (see that attached image, “Launcher properties
2018-01-09 12-44-12.png”).
An strace on that pid
sudo strace -p 1488 -b execve -o launcher.txt
[sudo] password for bruce:
yielded
restart_syscall(<... resuming interrupted poll ...>) = 1
read(3, "\2\0\0\0\0\0\0\0", 16) = 8
poll([{fd=3, events=POLLIN}, {fd=5, events=POLLIN}], 2, -1) = 1 ([{fd=3,
revents=POLLIN}])
read(3, "\2\0\0\0\0\0\0\0", 16) = 8
poll([{fd=3, events=POLLIN}, {fd=5, events=POLLIN}], 2, -1) = 1 ([{fd=3,
revents=POLLIN}])
read(3, "\2\0\0\0\0\0\0\0", 16) = 8
poll([{fd=3, events=POLLIN}, {fd=5, events=POLLIN}], 2, -1
I do not know how to read strace output. The “restart_syscall” line looks
suspiciously like an error recover execution.
The launcher disappearance behavior is captured in two images, before the
failure “Launcher failure a 2018-01-09 12-23-23.png” and during recovery
“Launcher failure b 2018-01-09 12-24-39.png”. They are attached.
** Attachment added: "before launcher failur"
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1741925/+attachment/5033648/+files/Launcher%20failure%20a%202018-01-09%2012-23-23.png
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https://bugs.launchpad.net/bugs/1741925
Title:
Unity launcher disappears on mouse-over launcher
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