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by renice123
Thu Oct 31, 2019 6:04 am
Forum: Troubleshooting
Topic: USB not working - how to force flashing of rpi-eeprom
Replies: 6
Views: 639

Re: USB not working - how to force flashing of rpi-eeprom

bootloader (target CPU) requires the correct ID. Without it,
you will be unable to access, read out, clear, or program the contents
of the flash memory. The requested ID depends on ID previously written
into the target CPU.
by renice123
Mon Oct 28, 2019 6:58 pm
Forum: Troubleshooting
Topic: 1GB and 2GB units run cooler than 4GB unit?
Replies: 5
Views: 572

Re: 1GB and 2GB units run cooler than 4GB unit?

If you use a computer with a different chipset, then increased current consumption (and an increase in operating temperature) can be considered reasonable. Memory chips are also microchips and a 1 GB memory chip consumes less current than a 4 GB memory chip (if the technologies are the same for thes...
by renice123
Mon Oct 28, 2019 6:24 pm
Forum: Troubleshooting
Topic: Pi4 crashes randomly (browser runs out of memory?)
Replies: 38
Views: 8367

Re: Pi4 crashes randomly (browser runs out of memory?)

All old Linux users have long known that Chromium (as well as several other well-known and “respected” browsers) was written with errors. This is not customary to talk about, but everyone knows. These errors are numerous and sometimes lead to “freezes”. Also, the Linux kernel has a lot of errors tod...
by renice123
Sat Oct 26, 2019 7:59 pm
Forum: Troubleshooting
Topic: Does Pi 4 support stereo sound?
Replies: 13
Views: 4246

Re: Does Pi 4 support stereo sound?

Yes, this is a pulseaudio problem. She is already many years old and has not yet been solved (oh! Do you know who wrote the code for pulseaudio?) I also encountered this problem on my Raspberry, but “fixed” it in another way. Did the following. Opened file /usr/share/pulseaudio/alsa-mixer/profile-se...
by renice123
Thu Oct 24, 2019 7:29 am
Forum: Troubleshooting
Topic: Raspberry Pi 4b - sudo reboot now - need to unplug power > 10seconds to recover (pisound HAT)
Replies: 32
Views: 2823

Re: Raspberry Pi 4b - sudo reboot now - need to unplug power > 10seconds to recover (pisound HAT)

Yes, now the problem becomes clearer. It's just that in electronics, “floating” is understood as an unstable (for example, not stabilized) voltage. Reflecting on your link, you can draw several not quite pleasant conclusions at once. The first one. "Hat" does not work correctly during the initial lo...
by renice123
Wed Oct 23, 2019 6:34 pm
Forum: Troubleshooting
Topic: WiFi speed on Pi4
Replies: 28
Views: 16129

Re: WiFi speed on Pi4

To find out the "real" speed you need to take a few steps. The first one. Your Wi-Fi router (on the provider side) should be able to work with high-speed wireless networks, and you should also configure it for high-speed operation. The provider should also not limit your speed. Many cheap roads do n...
by renice123
Fri Oct 18, 2019 12:21 pm
Forum: Troubleshooting
Topic: WiFi speed on Pi4
Replies: 28
Views: 16129

Re: WiFi speed on Pi4

In some cities (in my city) the number of Wi-Fi points in houses is so large that it is impossible to establish high-speed communication in the "lower" range. To go online at high speed, I switch to the 5 GHz band. When wi-fi is on, I see from 10 to 15 (six!) access points on a weekday. It seems to ...
by renice123
Fri Oct 18, 2019 12:03 pm
Forum: Troubleshooting
Topic: Use battery as a back-up when main power goes down
Replies: 15
Views: 1388

Re: Use battery as a back-up when main power goes down

Autonomous power supplies for computers are a headache. Of all that I saw, I liked the solution from http://www.mini-box.com/OpenUPS But there are many such boards and you need to check how well they work. Rpi4 does not consume a lot of current in the “normal” mode, but it should be borne in mind th...
by renice123
Fri Oct 18, 2019 7:58 am
Forum: Troubleshooting
Topic: The mystery of 3 dead pi4s
Replies: 21
Views: 3425

Re: The mystery of 3 dead pi4s

Now I use Raspberry as a desktop computer, so I'm also worried if I see messages about problems with the microcomputer. I have several computers, but I like to use silent Raspberries in a special cooling case ( ~ 43-48 C ) From the forums and conversations with friends (Russian-language Internet), I...
by renice123
Thu Oct 17, 2019 7:02 am
Forum: Troubleshooting
Topic: Audio not working
Replies: 1
Views: 271

Re: Audio not working

If the software volume control in Raspbian does not work (red cross on the top panel, there is no sound), then this means that the Linux sound system settings are incorrect. This is an incorrect operation of ALSA or PulseAudio (if this sound server is also installed). Paspberry by default works corr...
by renice123
Thu Oct 17, 2019 6:50 am
Forum: Troubleshooting
Topic: System has started ignoring I2C PCF8523 Real Time Clock
Replies: 8
Views: 858

Re: System has started ignoring I2C PCF8523 Real Time Clock

Hello. The settings of the config.txt file change over time, sometimes they add some options, sometimes they are deleted. Your decision to use systemd seems optimal and correct to me. I prefer not to use programs that use parameters config.txt - this is how I achieve reliable and portable solutions....
by renice123
Wed Oct 16, 2019 7:03 pm
Forum: Troubleshooting
Topic: Need to unplug&replug USB keyboard on startup (pi4)
Replies: 5
Views: 559

Re: Need to unplug&replug USB keyboard on startup (pi4)

Does the kernel return to the universal HID (hid-generic) driver? Try to check if the device generates any (invisible) action, install the evtest program and run sudo evtest . When prompted to enter the device, enter the number that matches your keyboard. PS You can connect a second keyboard to chec...
by renice123
Wed Oct 16, 2019 3:54 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4b - sudo reboot now - need to unplug power > 10seconds to recover (pisound HAT)
Replies: 32
Views: 2823

Re: Raspberry Pi 4b - sudo reboot now - need to unplug power > 10seconds to recover (pisound HAT)

It seems strange to me the theory of “chaotic” (floating) voltage on the raspberry pins. I believe in higher powers or in the cosmic mind, but a technical device is a technical device =) Moreover, you can always check with the engineers who created this computer what voltage on the raspberry pins re...
by renice123
Wed Oct 16, 2019 12:03 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4b - sudo reboot now - need to unplug power > 10seconds to recover (pisound HAT)
Replies: 32
Views: 2823

Re: Raspberry Pi 4b - sudo reboot now - need to unplug power > 10seconds to recover (pisound HAT)

No software fix can fix a hardware problem? If your computer “freezes” due to overheating, then the software fix will not fix the reboot (because at the time after the computer is turned off, no programs work, does it?). Here, rather, you need to look for soldered contacts that work poorly due to th...
by renice123
Wed Oct 16, 2019 11:38 am
Forum: Troubleshooting
Topic: Reload website in inactive tab (Chromium)
Replies: 2
Views: 205

Re: Reload website in inactive tab (Chromium)

It seems to me that this is an erroneous technical solution. Such a solution is possible, for example, if the pages where the photos are stored use AJAX to work with the browser ( Asynchronous Javascript and XML ), and the background support option is enabled in the browser. You can also do this by ...
by renice123
Wed Oct 16, 2019 9:45 am
Forum: Troubleshooting
Topic: No Internet connection despite wlan0 associated with $homenetwork
Replies: 1
Views: 227

Re: No Internet connection despite wlan0 associated with $homenetwork

Hello. Apparently you made changes to the wpa_supplicant file manually using a friend's instructions. After you returned home, the changes made were incorrect (not working) for your home network. Therefore, your microcomputer refuses to work with the home network. For example, I show what I have in ...
by renice123
Wed Oct 16, 2019 9:32 am
Forum: Troubleshooting
Topic: Need to unplug&replug USB keyboard on startup (pi4)
Replies: 5
Views: 559

Re: Need to unplug&replug USB keyboard on startup (pi4)

I had a similar logitech keyboard issue. But I changed the connection to the usb connectors and the problem disappeared. I know that my keyboard works a little bad on other computers, so I was not worried. I think this “strange” behavior is also associated with the hardware features of our favorite ...
by renice123
Wed Oct 16, 2019 9:18 am
Forum: Troubleshooting
Topic: Bluetooth not working with 256GB SD card - works fine with 64GB SD card
Replies: 6
Views: 461

Re: Bluetooth not working with 256GB SD card - works fine with 64GB SD card

You talk about the classic problem of a fake card. Communication failure, like other problems, may be due to the fact that the file system is working with errors (in Linux, any device and even a process can be represented as files). Given the low speed (slow write to the card), then most likely you ...
by renice123
Tue Oct 15, 2019 8:31 pm
Forum: Graphics, sound and multimedia
Topic: Rasberry PI 4 e DAC
Replies: 3
Views: 1602

Re: Rasberry PI 4 e DAC

DAC is a question about supported hardware. I used several external DACs (version raspberry 3 & 4), the DACs worked very well, but in Linux there are some kernel problems that make connecting the DACs difficult. In particular, the volume control does not always work correctly. Although everything is...
by renice123
Tue Oct 15, 2019 4:08 pm
Forum: Beginners
Topic: Connect to Yandex disk
Replies: 7
Views: 1341

Re: Connect to Yandex disk

I also use Yandex.Disk and I must say that I am observing some problems related to the peculiarity of Yandex. In particular, these are periodic “freezes” of the mounted partition. The second feature of working with Yandex.Disk is that upon rebooting, the system will try to “unmount” the remote servi...

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