#StackBounty: #16.04 #drivers #graphics #radeon System Lockup: radeon ring stalled for more than 10280msec

Bounty: 50

My system is frequently, but intermittently locking up. I am unsure of what to do next to troubleshoot and/or whether I should report this as a bug. Advice would be appreciated. Note that my question is similar to one previously posted at radeon 0000:02:00.0: ring 0 stalled for more than 10492msec that has yet to be responded to.

My system intermittently locks up every few days. When that happens, the screen goes to black, then returns. At that point, the time on the clock indicates that the screen is frozen, but audio continues to play for 30 seconds to a minute. The keyboard and mouse do not affect what’s being displayed, but I can Alt – SysRq – REISUB to restart.

Every time (6 crashes and counting), /var/log/kern.log indicates that

kernel: [353692.378886] radeon 0000:03:00.0: ring 0 stalled for more than 10280msec
kernel: [353692.378896] radeon 0000:03:00.0: GPU lockup (current fence id 0x00000000006e96e5 last fence id 0x00000000006e96e9 on ring 0)

just before the system locks. Different ring numbers are reported as stalling at different times.

I’m running 16.04 LTS. I have a Radeon HD graphics card.

:~$ lspci | grep VGA
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cedar [Radeon HD 5000/6000/7350/8350 Series]

:~$ lspci -v -s 03:00.0
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cedar [Radeon HD 5000/6000/7350/8350 Series] (prog-if 00 [VGA controller])
Subsystem: Gigabyte Technology Co., Ltd Cedar [Radeon HD 5000/6000/7350/8350 Series]
Flags: bus master, fast devsel, latency 0, IRQ 53
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at d3d20000 (64-bit, non-prefetchable) [size=128K]
I/O ports at 7000 [size=256]
Expansion ROM at d3d00000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: radeon
Kernel modules: radeon

In looking for solutions, I found an old bug report from 14.04 that is currently unassigned https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1409393.

[Edit:] Based on @MichaelBay ‘s suggestion, I ran the Checkbox graphics card tests and everything passed. I also I ran MemoryTest. No errors were found after 3 passes. Finally, I loaded Psensor to check the GPU temperatures, but there are no GPU readings.

Get this bounty!!!

#StackBounty: #16.04 #networking #dns #dhcp #routing Server not found issue after attempting to install and then remove OpenVPN

Bounty: 100

I can’t access internet on Ubuntu 16.04. It shows server not found on Firefox and I can’t access anything to install using terminal. My internet connection was working good but I tried to install openvpn using terminal and then removed it using terminal. From then this issue arose.

$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP,> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 bdr 00:00:00:00:00:00
    inet scope host lo
    valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
    valid_lft forever preferred_lft forever
2: enp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP>mtu 1500 qdisc mq state UP group default qlen 1000
    link/either 18:db:f2:4a:90:3e brd ff:ff:ff:ff:ff:ff

3: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/either e4:02:9b:48:c9:a2 brd ff:ff:ff:ff:ff:ff
    inet brd scope global wlp2s0
    valid_lft forever preferred_lft forever
    inet6 2405:204:6322:99a0:2c20:3623:c01a:161e/64 scope global temporary dynamic
    valid_lft 3387sec preferred_lft 3387sec
    inet6 2405:204:6322:99a0:e602:9bff:fe48:c9a2/64 scope global mngtmpaddr dynamic
    valid_lft 3387sec preferred_lft 3387sec
    inet6 fe80::e602:9bff:fe48:c9a2/64 scope link
    valid_lft forever preferred_lft forever


$ ping -c 10
PING ( 56(84) bytes of data 
64 bytes from icmp_seq=6 ttl=44 time=98.8ms
64 bytes from icmp_seq=7 ttl=44 time=97.9ms
64 bytes from icmp_seq=8 ttl=44 time=96.8ms
64 bytes from icmp_seq=9 ttl=44 time=95.7ms
64 bytes from icmp_seq=10 ttl=44 time=93.8ms

--- ping statistics ---
10 packets transmitted, 5 packets received, 50% packet loss, time 9119ms
rtt min/avg/max/mdev/ =93.863/96.641/98.800/1.741 ms


$ sudo dpkg -l resolvconf
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description    +++-==============-============-============-=================================
rc  resolvconf     1.78ubuntu6  all          name server information handler

$ sudo dpkg -l wpasupplicant
| Status=Not/Inst/conf-files/Unknown/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad
||/Name            Version      Architecture Description 
 ii  wpasupplicant 2.4-0ubuntu6 amd64         client support fpr WPA and WPA2

and ls /etc/ is here which is showing no /etc/resolv.conf file and does not let me create it manually either.

What’s the problem and how can I fix it?

Get this bounty!!!

#StackBounty: #16.04 #menu #notes Xournal toolbar abnormally scaled

Bounty: 250

I was taking notes during a class, when I suddenly got distracted, and the moment after this is what presented itself to my astonished self. The very same window, but with the toolbar abnormally scaled.
EDIT: I am not sure about it, but I don’t exclude having pressed some key. The only thing that had changed when looking back at the screen was the toolbar.
I tried purging and reinstalling Xournal, but the toolbar remains like this. (yes, the big white square that looks like a paper sheet is actually the colour picker)
Could anybody help me revert it?


Get this bounty!!!

#StackBounty: #16.04 #thinkpad #keyboard-backlight How to prevent the keyboard backlight from turning on when the laptop is woken from …

Bounty: 100

I have a Thinkpad 470 and I am running Ubuntu 16.04 LTS on it. I don’t like to keep the keyboard backlight on during daytime because I want to save battery among other things. What I have noticed is that the backlight turns itself on even if it is woken up from a state where the screen was dimmed completely or system had gone to sleep due to inactivity. The issue is that in day time or in presence of bright lights I am unable to see the backlight is on, thus I don’t switch it off and this drains the battery.
I want to be able to control this setting. How do I do this?

After searching a bit in the following location :


I found the following files:

rgh@arrakis:/sys/class/leds/tpacpi::kbd_backlight$ ls
brightness  brightness_hw_changed  device  max_brightness  
power  subsystem  trigger  uevent

From among these, the file trigger contains the following items inside:

[none] rfkill-any kbd-scrolllock kbd-numlock kbd-capslock kbd-kanalock 
kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock kbd-shiftllock 
kbd-shiftrlock kbd-ctrlllock kbd-ctrlrlock AC-online 
BAT0-charging-or-full BAT0-charging BAT0-full 
BAT0-charging-blink-full-solid BAT1-charging-or-full 
BAT1-charging BAT1-full BAT1-charging-blink-full-solid usb-gadget 
usb-host disk-activity ide-disk mtd nand-disk cpu cpu0 cpu1 cpu2 cpu3 
panic bluetooth-power rfkill0 rfkill1 phy0rx phy0tx phy0assoc phy0radio 
hci0-power rfkill41

I am guessing something here needs to be removed to get the behaviour I am looking for? Can you please tell me if I am correct? How to get this done?

Get this bounty!!!

#StackBounty: #16.04 #qt OpenCOR, "could not find or load the Qt platform plugin "xcb""

Bounty: 50

I’m trying to install OpenCor

When I try to launch it I got this error message :

This application failed to start because it could not find or load the Qt platform plugin "xcb"

I have found lot page on internet and some post, but nothing solved my problem….

I using Ubuntu 16.04 LTS


I have try to :

sudo apt-get install xcb 

Which was already satified,

I tried almost everything proposed on this post.

Get this bounty!!!

#StackBounty: #16.04 #network-manager #dns #dhcp #ubuntu-gnome How to specify additional search domains for resolver in 16.04 when usin…

Bounty: 50

With Gnome Ubuntu 14.04, it was possible to specify additional search domains for the resolv.conf, when editing a network connection, like so:

Network Settings dialog in Gnome Ubuntu 14.04

But where do I find this field for the “additional search domains” in Ubuntu 16.04?

Is the only “real” way to modify /etc/resolvconf/resolv.conf.d/base or /etc/resolvconf/resolv.conf.d/head? Is there no GUI way to do this?

Get this bounty!!!

#StackBounty: #16.04 #server #php #nginx #cache Failed to implement Nginx caching – connection refused

Bounty: 50

I’m having trouble getting my site to work after trying to implement Nginx caching.

I use Ubuntu 16.04 (xenial), Nginx (1.10.3), PHP-FPM (7.0) and WordPress.

Port 9000 (for php-fpm) is unfiltered by UFW.

Reproducing my environment

1 – setting confs:

2 – Creating a cache dir:

mkdir -p /var/cache/nginx/fastcgi_temp/cache/
chmod 755 /var/cache/nginx/fastcgi_temp/cache/
chown www-data:www-data /var/cache/nginx/fastcgi_temp/cache/

3 – Server restart:

systemctl restart nginx.service
/etc/init.d/php*-fpm restart

4- Error and debug tries:

/etc/init.d/php*-fpm status

‚óŹ php7.0-fpm.service - The PHP 7.0 FastCGI Process Manager

Loaded: loaded (/lib/systemd/system/php7.0-fpm.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Fri 2018-04-13 07:07:02 UTC; 2h 34min ago
Process: 15060 ExecStart=/usr/sbin/php-fpm7.0 --nodaemonize --fpm-config /etc/php/7.0/fpm/php-fpm.conf (code=exited, status=78)
Process: 15051 ExecStartPre=/usr/lib/php/php7.0-fpm-checkconf (code=exited, status=0/SUCCESS)
Main PID: 15060 (code=exited, status=78)

My question

Why is the connection refused and my site is down?

Get this bounty!!!