*** 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
Status in mesa package in Ubuntu:
New
Bug description:
Move the mouse over the launcher and the EVERYTHING on the desktop
disappears for a few seconds. Only the wallpaper remains. Failed
immediately after the latest update (installed by me on 5 Jan 2018)
and a reboot. Reboot doesn't help.
Launcher and the other desktop displays return after a 10 to 30 second
pause. No disk activity is observed during recovery.
"ClassicMenu Indicator" is installed and it is the only way to start
an application.
Executing the bug and then immediately examining all the /var/log logs
showed no recorded error or incident in any log.
uname -a = Linux bruce-Latitude-D630 4.10.0-42-generic
#46~16.04.1-Ubuntu SMP Mon Dec 4 15:57:59 UTC 2017 i686 i686 i686
GNU/Linux
Abridged hardware list from sudo lshw
description: Portable Computer
product: Latitude D630
vendor: Dell Inc.
width: 32 bits
capabilities: smbios-2.4 dmi-2.4
configuration: boot=normal chassis=portable
uuid=44454C4C-6E00-1039-8032-B2C04F376831
*-core
description: Motherboard
vendor: Dell Inc.
physical id: 0
serial: .2n927h1. .
*-firmware
description: BIOS
vendor: Dell Inc.
physical id: 0
version: A12
date: 06/20/2008
size: 64KiB
capacity: 1984KiB
capabilities: isa pci pcmcia pnp upgrade shadowing cdboot
bootselect int13floppy720 int5printscreen int9keyboard int14serial int17printer
int10video acpi usb agp smartbattery biosbootspecification netboot
*-cpu
description: CPU
product: Intel(R) Core(TM)2 Duo CPU T7250 @ 2.00GHz
vendor: Intel Corp.
physical id: 400
bus info: cpu@0
version: 6.15.13
serial: 0000-06FD-0000-0000-0000-0000
slot: Microprocessor
size: 2GHz
capacity: 2001MHz
width: 64 bits
clock: 200MHz
capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae
mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2
ss ht tm pbe nx constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64
monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm tpr_shadow vnmi
flexpriority dtherm ida cpufreq
configuration: cores=2 enabledcores=2 id=0 threads=2
*-cache:0
description: L1 cache
physical id: 700
size: 32KiB
capacity: 32KiB
capabilities: internal write-back data
configuration: level=1
*-cache:1
description: L2 cache
physical id: 701
size: 2MiB
capacity: 2MiB
clock: 66MHz (15.0ns)
capabilities: pipeline-burst internal varies unified
configuration: level=2
*-logicalcpu:0
description: Logical CPU
physical id: 0.1
width: 64 bits
capabilities: logical
*-logicalcpu:1
description: Logical CPU
physical id: 0.2
width: 64 bits
capabilities: logical
*-memory
description: System Memory
physical id: 1000
slot: System board or motherboard
size: 2GiB
*-bank:0
description: DIMM DDR Synchronous 667 MHz (1.5 ns)
product: V916765G24QCFW-F5
vendor: ProMOS/Mosel Vitelic
physical id: 0
serial: 07B02E7C
slot: DIMM_A
size: 1GiB
width: 64 bits
clock: 667MHz (1.5ns)
*-bank:1
description: DIMM DDR Synchronous 667 MHz (1.5 ns)
product: V916765G24QCFW-F5
vendor: ProMOS/Mosel Vitelic
physical id: 1
serial: E9AE2E7D
slot: DIMM_B
size: 1GiB
width: 64 bits
clock: 667MHz (1.5ns)
*-pci
description: Host bridge
product: Mobile PM965/GM965/GL960 Memory Controller Hub
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 0c
width: 32 bits
clock: 33MHz
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