What would cause the macro mode to hang on my Panasonic Lumix DMC camera?

I have a Panasonic Lumix DMC TZ55. Suddenly, I can not use the macro on my camera. On the monitor it says "lock" with an arrow underneath. How do I unlock it? What is causing the macro to stop working?

files – fcntl could not block / dev / null and hang

An example of minimal work, but only for my machine:

int main (int argc, char * argv[]) {


int fd = open ("/ dev / null", O_RDWR | O_CREAT);
yes (fd <0) {
printf ("Error opening file  n");
}

herd block structure;
lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
lock.l_start = 0;
lock.l_len = 0;

int res = fcntl (fd, F_SETLKW, & lock); // this hangs
yes (res <0) {
printf ("Error blocking  n");
}
close (fd);
return (0);
}

The above program hang alone on my machine, and completed instantly on 7 other machines. Is there anything I can investigate to investigate this problem?

strace shows that fcntl was getting stuck when ^ C killed the program (./t).

5249 execve ("./t", ["./t"], [/* 23 vars */]) = 0
5249 brk (NULL) = 0x1cf6000
Access 5249 ("/ etc / ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory exists)
Access 5249 ("/ etc / ld.so.preload", R_OK) = -1 ENOENT (No such file or directory exists)
5249 open ("/ etc / ld.so.cache", O_RDONLY | O_CLOEXEC) = 3
5249 fstat (3, {st_mode = S_IFREG | 0644, st_size = 98358, ...}) = 0
5249 mmap (NULL, 98358, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f31a1118000
5249 close (3) = 0
Access 5249 ("/ etc / ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory exists)
5249 open ("/ lib / x86_64-linux-gnu / libc.so.6", O_RDONLY | O_CLOEXEC) = 3
5249 read (3, " 177ELF  2  1  1  3  0  0  0  0  0  0  0  0  3  0>  0  1  0  0  0P  t  2  0  0  0  0  0 "..., 832) = 832
5249 fstat (3, {st_mode = S_IFREG | 0755, st_size = 1868984, ...}) = 0
5249 mmap (NULL, 4096, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) = 0x7f31a1117000
5249 mmap (NULL, 3971488, PROT_READ | PROT_EXEC, MAP_PRIVATE | MAP_DENYWRITE, 3, 0) = 0x7f31a0b42000
5249 mprotect (0x7f31a0d02000, 2097152, PROT_NONE) = 0
5249 mmap (0x7f31a0f02000, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED | MAP_DENYWRITE, 3, 0x1c0000) = 0x7f31a0f02000
5249 mmap (0x7f31a0f08000, 14752, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, -1, 0) = 0x7f31a0f08000
5249 close (3) = 0
5249 mmap (NULL, 4096, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) = 0x7f31a1116000
5249 mmap (NULL, 4096, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) = 0x7f31a1115000
5249 arch_prctl (ARCH_SET_FS, 0x7f31a1116700) = 0
5249 mprotect (0x7f31a0f02000, 16384, PROT_READ) = 0
5249 mprotect (0x600000, 4096, PROT_READ) = 0
5249 mprotect (0x7f31a1131000, 4096, PROT_READ) = 0
5249 map mun (0x7f31a1118000, 98358) = 0
5249 open ("/ dev / null", O_RDWR | O_CREAT, 03777762203636510) = 3
5249 fcntl (3, F_SETLKW, {l_type = F_WRLCK, l_whence = SEEK_SET, l_start = 0, l_len = 0}) =? ERESTARTSYS (Will be restarted if SA_RESTART is set)
5249 --- SIGINT {si_sign = SIGINT, si_code = SI_KERNEL} ---
5249 +++ killed by SIGINT +++

Boot hang dell kbd_backlight Ubuntu 18.10

I have a problem with my Dell Inspiron 5570. The startup crashes after "starting the load / save RF deactivation switch" when the system tries to load the kbd_backlight dell service. The only way I can make the system start repeats the restarts (by pressing the power button). Sometimes it will take up to 10 hardware reboots before Linux passes the lock point. I noticed that when it starts there is a message that says something like [FAILED] dell kbd_backlight.service. The system will boot well in recovery mode. I researched the problem on Google and discovered that this is an old error that has not yet been resolved. I tried the job

(Grub- advanced- recovery- root shell)
monte -o ski lift, rw /
rm / var / lib / systemd / backlight / platform-dell-laptop: leds: dell :: kbd_backlight
Systemdl systemd-backlight mask @ leds: dell :: kbd_backlight.service
restart

But the problem persists … Any ideas about what I could try?
Thank you,
Derek

hang up – Mojave freezes for a fraction of a second every 25 seconds when there is a second registered user

The touch bar of my MacBook Pro 2016 with Mojave freezes for a fraction of a second every 20 to 30 seconds when there is another user registered in the operating system.

But the other account does not have any application or suspicious process running.
The Console.app does not show anything relevant during the small freeze.

I see many users complaining about freezing the cursor every time, but with my laptop it freezes the screen, the keyboard and the mouse.

I do not use a second monitor or any other accessory. Only the laptop that uses the touchpad as a mouse, not an external mouse.

The problem does not occur with a registered user.

Is there any clue about this problem?