Ethernet not working on a Dell notebook

[frantal]

Hello,

I have a Dell notebook Vostro 3700 that doesn't work on ethernet connection 
Here I give some feature of system and hardware:

root@debian:/home/frantal# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 12 (bookworm)
Release: 12
Codename: bookworm
root@debian:/home/frantal# uname -a
Linux debian 6.1.0-18-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.76-1 (2024-02-01) 
x86_64 GNU/Linux
root@debian:/home/frantal# route -n
bash: route: comando non trovato
root@debian:/home/frantal# cat /etc/resolv.conf
# Generated by NetworkManager
root@debian:/home/frantal# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback
auto eth0
root@debian:/home/frantal# nmcli
lo: connected (externally) to lo
"lo"
loopback (unknown), 00:00:00:00:00:00, sw, mtu 65536
inet4 127.0.0.1/8
inet6 ::1/128

enp19s0: non disponibile
"Realtek RTL8111/8168/8411"
ethernet (r8168), A4:BA:DB:B5:ED:62, hw, mtu 1500

wlp18s0b1: non disponibile
"Broadcom and subsidiaries BCM43224"
wifi (brcmsmac), FA:9F:4C:C0:08:26, sw disabled, hw disabled, hw, mtu 1>

Usare «nmcli device show» per ottenere informazioni sui dispositivi noti e
«nmcli connection show» per ottenere una panoramica sui profili di connessione
attivi.

Per maggiori informazioni sull'utilizzo, consultare le pagine di manuale nmcli(>
e nmcli-examples(7).
root@debian:/home/frantal# lspci
00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 12)
00:01.0 PCI bridge: Intel Corporation Core Processor PCI Express x16 Root Port 
(rev 12)
00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series 
Chipset HECI Controller (rev 06)
00:1a.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 
Enhanced Host Controller (rev 06)
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High 
Definition Audio (rev 06)
00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express 
Root Port 1 (rev 06)
00:1c.1 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express 
Root Port 2 (rev 06)
00:1c.2 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express 
Root Port 3 (rev 06)
00:1c.3 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express 
Root Port 4 (rev 06)
00:1c.4 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express 
Root Port 5 (rev 06)
00:1d.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 
Enhanced Host Controller (rev 06)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev a6)
00:1f.0 ISA bridge: Intel Corporation HM57 Chipset LPC Interface Controller 
(rev 06)
00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 6 port 
SATA AHCI Controller (rev 06)
00:1f.3 SMBus: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller 
(rev 06)
00:1f.6 Signal processing controller: Intel Corporation 5 Series/3400 Series 
Chipset Thermal Subsystem (rev 06)
01:00.0 VGA compatible controller: NVIDIA Corporation GT216M [GeForce GT 330M] 
(rev a2)
01:00.1 Audio device: NVIDIA Corporation GT216 HDMI Audio Controller (rev a1)
12:00.0 Network controller: Broadcom Inc. and subsidiaries BCM43224 
802.11a/b/g/n (rev 01)
13:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 
PCI Express Gigabit Ethernet Controller (rev 03)
14:00.0 SD Host controller: Ricoh Co Ltd MMC/SD Host Controller (rev 01)
14:00.1 System peripheral: Ricoh Co Ltd R5U2xx (R5U230 / R5U231 / R5U241) 
[Memory Stick Host Controller] (rev 01)
14:00.3 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 PCIe IEEE 1394 Controller 
(rev 01)
ff:00.0 Host bridge: Intel Corporation Core Processor QuickPath Architecture 
Generic Non-core Registers (rev 02)
ff:00.1 Host bridge: Intel Corporation Core Processor QuickPath Architecture 
System Address Decoder (rev 02)
ff:02.0 Host bridge: Intel Corporation Core Processor QPI Link 0 (rev 02)
ff:02.1 Host bridge: Intel Corporation 1st Generation Core i3/5/7 Processor QPI 
Physical 0 (rev 02)
ff:02.2 Host bridge: Intel Corporation 1st Generation Core i3/5/7 Processor 
Reserved (rev 02)
ff:02.3 Host bridge: Intel Corporation 1st Generation Core i3/5/7 Processor 
Reserved (rev 02)

Finally while trying to find the solution I tried this command and after some 
seconds I was online:

sudo mii-tool enp19s0 -F 10baseT-FD

The problem is that every time I shut off the notebook Ito have ethernet 
connection again I have to give that command by terminal. Is there the 
possibility to make default this ethernet module? Thanks and regards

Francesco

Re: Ethernet not working on a Dell notebook

[Marco Moock]

Am 12.03.2024 um 09:11:20 Uhr schrieb fran...@libero.it:

> Finally while trying to find the solution I tried this command and
> after some seconds I was online:
> 
> sudo mii-tool enp19s0 -F 10baseT-FD

That seems to be an autoneg problem.

Please tell us more about your cabling (direct, via sockets etc.) and
the device (switch, router) the laptop is connected to.

-- 
kind regards
Marco

Send spam to 1710231080mu...@cartoonies.org

Re: Bluetooth sound problems Debian 12 GNOME

[Jan Krapivin]

It is strange. I can see in a Debian mailing list an answer

- *From*: Ottavio Caruso 
- *Date*: Mon, 11 Mar 2024 16:50:45 +

"Not sure if this is your case, I had the same problem but I upgraded from
11 to 12. The transition from pulse to pipewire was not smooth. So I nuked
anything *pulse* and *bluetooth* and reinstalled from scratch using the
Debian guide:

https://wiki.debian.org/PipeWire

Is this a brand new installation or an upgrade?"

But i can't see it in my mailbox


*ANSWER*


No, this is a clean new installation. And it looks like i have the
same problem on another laptop with Debian 12 XFCE (Pulseaudio).

But the problem is with *TWO* headsets, so i am in question whats
happening with Debian, because Linux Mint and Android works fine...





пн, 11 мар. 2024 г. в 23:48, Jan Krapivin :

> Hello again. I have used *pactl subscribe *command and i think that in
> the moment of sound interrupt there are the corresponding lines:
>
> "Event 'remove' on sink-input #353
> Event 'new' on sink-input #358
> Event 'change' on sink-input #358"
>
> As for journald i have a lot of such errors, but they don't influence the
> audio quality:
>
> "Mar 11 22:20:13 deb wireplumber[1357]: RFCOMM receive command but modem
> not available: AT+XIAOMI=1,1,102,85,88,27,174"
>
> There are some other mentions of the bluetooth/headphones, but they don't
> meet the moment of sound issues. Full journald -f log is in an attachment.
>
> I must say that i had an opportunity today to test a laptop with Debian 12
> XFCE laptop with Pulseaudio and the problem is the same there. But, as i
> said, on a laptop with Linux Mint XFCE everything is fine. That's strange.
> What is the main difference between Linux Mint and Debian here..?
>
> I also tried Liquorix 6.7 kernel but it didn't help.
>
> Thanks.
>

Re: printing QR-codes on labels with 300dpi label printers with LaTeX

[hw]

On Mon, 2024-03-11 at 09:57 +0800, jeremy ardley wrote:
> On 11/3/24 07:34, hw wrote:
> > Do you think that thermal transfer printers with 203dpi would be
> > better suited to print QR codes than the 300dpi multi-mode printers?
> > 
> > I'm not fond of thermal transfer at all.  Usually what is being
> > printed that way fades rather quickly over time and is more slightly
> > gray rather than black and so thin that it's hard to read even when
> > freshly printed.  Perhaps better labels are available, but the labels
> > must not get too expensive ...
> 
> 
> Thermal transfer and thermal direct printers have the same resolution.
> 
> Thermal transfer printers are used for archival labels as they fade very 
> little over time.
> 
> Direct thermal printers are intended for mailing applications where it 
> doesn't matter if they fade after a few months.
> 
> Given that, I think a lot of commercial shippers use thermal transfer 
> for mailing labels. Very few shippers use laser printed adhesive address 
> label, nor non-adhesive in pockets or pouches.
> 
> To print a QR code or other 2D code on any thermal printer, the printer 
> manufacturer will supply an application that generate the codes and 
> prints them independently of the host printing system. These codes will 
> scan perfectly.

Even if they did that, it would be totally useless because it won't be
able to automatically print labels from databases.

> It is possible to use document generation tools like latex and printing 
> systems like CUPS to print a label, but pixel registration will be poor. 

Why?  The manufacturer provided a CPUS printer driver without which
printing wouldn't be possible at all.

> The only practical option for this route is to print the code BIG
 
That's what I thought, but then the codes won't fit on the labels.
That's why I wonder if there's a better way.



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Re: Ethernet not working on a Dell notebook

[Anssi Saari]

fran...@libero.it writes:

> sudo mii-tool enp19s0 -F 10baseT-FD
>
> The problem is that every time I shut off the notebook Ito have ethernet 
> connection again I have to give that command by terminal. Is
> there the possibility to make default this ethernet module? Thanks and regards

You can specify ethtool commands to be run in /etc/network/interfaces,
see /usr/share/doc/ethtool/README.Debian for details. I'm not sure
if that'll work with NetworkManager, though.

But, having to force 10baseT probably indicates other issues like a bad
cable, as Marco said.

Re: Ethernet not working on a Dell notebook

[Marco Moock]

Am 12.03.2024 um 10:17:05 Uhr schrieb fran...@libero.it:

> it is connected via a Switch (Netgear) to the modem-router. 
> If I use this cable with other computers it works without problems.

Please test another cable and another switch if available. We need to
track down the problem.

-- 
Gruß
Marco

Send spam to 1710235025mu...@cartoonies.org

Re: Bluetooth sound problems Debian 12 GNOME

[Max Nikulin]

On 12/03/2024 03:48, Jan Krapivin wrote:


As for journald i have a lot of such errors, but they don't influence 
the audio quality:


"Mar 11 22:20:13 deb wireplumber[1357]: RFCOMM receive command but modem 
not available: AT+XIAOMI=1,1,102,85,88,27,174"


Headphones might expect some response to some of these command and might 
drop connection otherwise.



journalctl -f
Hint: You are currently not seeing messages from other users and the system.
  Users in groups 'adm', 'systemd-journal' can see all messages.


Run the command as root, but you already have enough keywords to search 
in bug reports and discussions related to PipeWire and pulseaudio. The 
latter may have some workarounds for specific models of headphones.



Mar 11 23:14:11 deb gsd-media-keys[1744]: Unable to get default sink
Mar 11 23:14:11 deb /usr/libexec/gdm-x-session[1449]: (II) event25 - Haylou W1 
(AVRCP): device removed
Mar 11 23:14:11 deb gsd-media-keys[1744]: Unable to get default sink
Mar 11 23:14:11 deb /usr/libexec/gdm-x-session[1449]: (II) event25 - Haylou W1 
(AVRCP): device removed
Mar 11 23:14:11 deb /usr/libexec/gdm-x-session[1449]: (**) Option "fd" "78"
Mar 11 23:14:11 deb /usr/libexec/gdm-x-session[1449]: (II) UnloadModule: 
"libinput"
Mar 11 23:14:11 deb /usr/libexec/gdm-x-session[1449]: (II) systemd-logind: 
releasing fd for 13:89
Mar 11 23:14:11 deb /usr/libexec/gdm-x-session[1449]: (EE) systemd-logind: 
failed to release device: Device not taken
Mar 11 23:14:12 deb wireplumber[1357]: set volume 74 failed for transport 
/org/bluez/hci0/dev_9C_19_C2_1B_A7_25/sep4/fd1 (No such property 'Volume')
Mar 11 23:14:14 deb /usr/libexec/gdm-x-session[1449]: (II) config/udev: Adding 
input device Haylou W1 (AVRCP) (/dev/input/event25)
Mar 11 23:14:14 deb /usr/libexec/gdm-x-session[1449]: (**) Haylou W1 (AVRCP): Applying 
InputClass "libinput keyboard catchall"
Mar 11 23:14:14 deb /usr/libexec/gdm-x-session[1449]: (II) Using input driver 
'libinput' for 'Haylou W1 (AVRCP)'


So device disappears for some reason. Perhaps driver receives something 
unexpected, perhaps headphone do not receive something they expect.



Mar 11 23:24:28 deb /usr/libexec/gdm-x-session[1449]: (II) XINPUT: Adding extended input 
device "Haylou W1 (AVRCP)" (type: KEYBOARD, id 20)


Check if similar lines are logged on Mint. KEYBOARD looks a bit strange, 
but perhaps it is normal for GNOME.


PipeWire mailing list or forum may be a better place to discuss the issue.

Bind9 local DNS not forwarding query to public DNS

[Muhammad Yousuf Khan]

  Dear All,
Need your experience advice, We have a BIND9 DNS server that operates both
privately and publicly for the domain example xyz.com. I use the private
DNS for certain secure nodes on our local network. I want all VPN users to
be able to resolve these secure nodes using our local DNS, which is
functioning correctly.

So I force assign all VPN user local DNS so that they can access the secure
records and local DNS can forward their query to public DNS in case the
record is not found in the zone file.

 locally everything is working just fine, the issue arises when a VPN user
queries an A record that is on public. For example, if "secure.xyz.com" has
a local entry in the zone file, it works as expected. However, when the
entry is not present, I expect BIND to conditionally forward the query to a
remote DNS server and resolve it for the VPN client. Unfortunately, this is
not happening. BIND only searches for entries that are available in the
local zone file and then times out. Here are my configuration files.

here is my bind config


 options {
 directory "/var/cache/bind";
 recursion yes;   // Enable DNS recursion
 allow-recursion { localhost; };
 //acl trusted { 192.168.1.0/24; };
 querylog yes;
 allow-transfer { none; };   // Disable zone transfers
by default
 allow-query { any; };   // Allow queries from any
IP address
 forwarders {
  8.8.8.8;
 };
 dnssec-validation auto;
 listen-on-v6 { any; };
 };

  zone "xyz.com" {
  type master;
  file "/etc/bind/db.xyz.com";
  forwarders {
  8.8.8.8;
  8.8.4.4;// Additional forwarder (optional)
  };
  };



Thanks,

Yousuf

Re: Ethernet not working on a Dell notebook

[Max Nikulin]

On 12/03/2024 15:11, fran...@libero.it wrote:

13:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 
PCI Express Gigabit Ethernet Controller (rev 03)


lspci -vnn -s 13:00.0

should give more detailed info concerning your network adapter.

Finally while trying to find the solution I tried this command and after 
some seconds I was online:


sudo mii-tool enp19s0 -F 10baseT-FD


Perhaps it is obvious, but do you have the firmware-realtek package 
installed?


Inspect journalctl output, NetworkManager should log negotiation failures.

Re: Bind9 local DNS not forwarding query to public DNS

[Eduardo M KALINOWSKI]

On 12/03/2024 12:48, Muhammad Yousuf Khan wrote:

   Dear All,
Need your experience advice, We have a BIND9 DNS server that operates 
both privately and publicly for the domain example xyz.com 
. I use the private DNS for certain secure nodes on our 
local network. I want all VPN users to be able to resolve these secure 
nodes using our local DNS, which is functioning correctly.


So I force assign all VPN user local DNS so that they can access the 
secure records and local DNS can forward their query to public DNS in 
case the record is not found in the zone file.


  locally everything is working just fine, the issue arises when a VPN 
user queries an A record that is on public. For example, if 
"secure.xyz.com " has a local entry in the zone 
file, it works as expected. However, when the entry is not present, I 
expect BIND to conditionally forward the query to a remote DNS server 
and resolve it for the VPN client. Unfortunately, this is not happening. 
BIND only searches for entries that are available in the local zone file 
and then times out. Here are my configuration files.


here is my bind config


  options {
              directory "/var/cache/bind";
              recursion yes;                   // Enable DNS recursion
              allow-recursion { localhost; };


You're only allowing recursion from localhost. I guess you need to allow 
the internal VPN addresses here. Maybe that's the (commented) acl below, 
so try something like


allow-recursion { "trusted"; };

(Maybe the acl needs to be defined before it's used, I'm not sure.)


              //acl trusted {192.168.1.0/24; };


But remember to add localhost to the acl, so that local processes can 
also use the recursive server.



              querylog yes;
              allow-transfer { none; };       // Disable zone transfers by 
default
              allow-query { any; };           // Allow queries from any IP 
address
              forwarders {
                   8.8.8.8;
              };
              dnssec-validation auto;
              listen-on-v6 { any; };
      };

       zone "xyz.com" {
           type master;
           file "/etc/bind/db.xyz.com";
           forwarders {
               8.8.8.8;
               8.8.4.4;                    // Additional forwarder (optional)
           };
       };



Thanks,

Yousuf




--
pension:
A federally insured chain letter.

Eduardo M KALINOWSKI
edua...@kalinowski.com.br

Re: Bind9 local DNS not forwarding query to public DNS

[Dan Ritter]

Muhammad Yousuf Khan wrote: 
> Need your experience advice, We have a BIND9 DNS server that operates both
> privately and publicly for the domain example xyz.com. I use the private
> DNS for certain secure nodes on our local network. I want all VPN users to
> be able to resolve these secure nodes using our local DNS, which is
> functioning correctly.
> 
> So I force assign all VPN user local DNS so that they can access the secure
> records and local DNS can forward their query to public DNS in case the
> record is not found in the zone file.
> 
>  locally everything is working just fine, the issue arises when a VPN user
> queries an A record that is on public. For example, if "secure.xyz.com" has
> a local entry in the zone file, it works as expected. However, when the
> entry is not present, I expect BIND to conditionally forward the query to a
> remote DNS server and resolve it for the VPN client. Unfortunately, this is
> not happening. BIND only searches for entries that are available in the
> local zone file and then times out. Here are my configuration files.
> 
> here is my bind config
> 
> 
>  options {
>  directory "/var/cache/bind";
>  recursion yes;   // Enable DNS recursion
>  allow-recursion { localhost; };

^ only localhost is allowed to do recursive queries. But you
want all your internal users to be allowed to do that.

>  allow-query { any; };   // Allow queries from any
> IP address
>  forwarders {
>   8.8.8.8;
>  };
>  dnssec-validation auto;
>  listen-on-v6 { any; };
>  };
> 
>   zone "xyz.com" {
>   type master;
>   file "/etc/bind/db.xyz.com";
>   forwarders {
>   8.8.8.8;
>   8.8.4.4;// Additional forwarder (optional)

^ you do not want forwarders here.

-dsr-

Re: Bluetooth sound problems Debian 12 GNOME

[Max Nikulin]

On 12/03/2024 03:48, Jan Krapivin wrote:


"Mar 11 22:20:13 deb wireplumber[1357]: RFCOMM receive command but modem 
not available: AT+XIAOMI=1,1,102,85,88,27,174"


Just a wild guess, unlikely it is true. Headphones might report battery 
charge level using a vendor protocol extension. 85 and 88 are decreasing 
in later messages.


Sound stream may be interrupted when headphones decide to balance 
battery discharge by switching device that communicates with laptop.


Perhaps messages related to input devices are different because it is 
Wayland session while I use KDE with X11 session, so in my case 
messages are "Watching system buttons" instead of "KEYBOARD...".


You may use --since and --until journalctl options to get system logs 
for the same time intervals you posted.

Re: printing QR-codes on labels with 300dpi label printers with LaTeX

[jeremy ardley]

On 12/3/24 21:21, hw wrote:


Even if they did that, it would be totally useless because it won't be
able to automatically print labels from databases.


The manufacturer applications  usually allow you to print a list from a 
spreadsheet or text file.



It is possible to use document generation tools like latex and printing
systems like CUPS to print a label, but pixel registration will be poor.

Why?  The manufacturer provided a CPUS printer driver without which
printing wouldn't be possible at all.


Most custom barcodes programs run on windows and don't use CUPS.

Manufacturers can provide CUPS drivers as well, but the barcode 
application is usually only windows.


In my case I had to write my own CUPS driver as the manufacturer does 
not provide one.


Getting back to pixel registration, the latex CUPS route is very 
unlikely to work well. However a custom application that generates a 
pixel perfect bitmap that is printed at 100% scale through cups should work.


There are a number of programs that can do that, though I have not used 
them so far.


- zint

- GNU barcode

- BWIPP

also a possibility is

- qrencode

Re: printing QR-codes on labels with 300dpi label printers with LaTeX

[hw]

On Mon, 2024-03-11 at 11:58 +0100, Florent Rougon wrote:
> Hi,
> 
> I haven't read the whole thread (sorry) but thought this might help.
> 
> hw  wrote:
> 
> > When I zoom in on QR-codes in a PDF viewer, they don't get blurry.
> > Perhaps the pst-barcode package uses vector graphics?
> 
> That is quite likely: the pst- prefix means this is PSTricks, which is
> an oldish way of doing vector graphics with LaTeX. I tend to avoid
> PSTricks these days as it is generally awkward to use in PDF contexts,
> although there are various workarounds that often allow to do so.

Is that bad?  It works great for what I'm doing.

> The ubiquitous, powerful and modern way to do vector graphics in LaTeX
> is PGF/TiKZ[1],

That package has almost 1300 pages of documentation which doesn't seem
to mention qr-codes or barcodes.

> however this is not even necessary for QR codes, because
> [...]

good :)

> I've played with a different package for producing QR codes in LaTeX,
> which uses the aforementioned \hrule and \vrule primitives: qrcode. Its
> manual is here (follow the “Package documentation” link):
> 
>   https://ctan.org/pkg/qrcode

I wonder why it uses different options for URLs and other data.  What
difference does that make?

> Here is a simple example you can compile with pdflatex:
> 
> \documentclass{article}
> \usepackage{qrcode}
> 
> \pagestyle{empty}
> 
> \begin{document}
> 
> \noindent
> % \qrset affects \qrcode commands in the current group. You can use it
> % to factor out options used for several QR codes.
> \qrset{nolinks, padding}% add padding to make sure the codes are 
> “legal”/readable
> \qrcode[version=1]{Hey Debian-user!}% Can't do version=1 with level=M or more
> \qrcode[level=L, version=1]{Hey Debian-user!}% Less redundancy but is doable
> 
> \end{document}
> 
> Note the terminal output:
> 
> 
> 
>  Version increased to '2' to fit text.>
> 
> 
>  calculated.>
> 
> 
> 
> 
>  calculated.>
> 

It might be worth a try for when I need to experiment with qr-codes on
small labels again.  It might not work because I may need to place the
qr-code in some way and it could conflict with other packages like the
labels package ...  I even might have already tried it; it's been a
few years and I don't remember exactly.

> [...]
> But with low printer resolution constraints, who knows?).
> 
> Hope this helps!

Yes, thanks, knowing about these packages can be useful.

Now I'm wondering why the qr-codes I printed with the label printer
couldn't be reliably scanned.  When I look at [1] and [2], for the
data I wanted to print (between 38 and 40 alphanumericals at L
quality) I would have to use a version 2 qr code, i. e. 25x25 modules.
I don't know how the modules transfer to dots, but assuming the
minimum of 4 dots per module, it would take 25 x 4 dots, i. e. 100
dots.  Each module would be 0.33mm in size which would require 25 x
0.33mm, i. e. 8.25mm for the size of the qr-code.

I printed the qr-code much larger than that, about 1x1".  That is
about three times as large as would be required, and the printer can
print three times as many dots per inch as the 100 dots needed.

So in theory, my theory that the resolution of the printer is too low
can't be true.

But why couldn't these qr-codes be scanned?  It shouldn't have been a
problem at all.


[1]: https://www.qrcode.com/en/about/version.html
[2]: https://www.qrcode.com/en/howto/cell.html

> 
> Regards
> 
> [1] https://ctan.org/pkg/pgf
> 





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Re: printing QR-codes on labels with 300dpi label printers with LaTeX

[hw]

On Mon, 2024-03-11 at 23:45 +0700, Max Nikulin wrote:
> On 11/03/2024 08:06, hw wrote:
> > On Sun, 2024-03-10 at 09:50 +0700, Max Nikulin wrote:
> > > On 10/03/2024 04:41, hw wrote:
> > > > \psbarcode{textblah foo}{height=0.6 width=0.6 eclevel=L}{qrcode}
> > > > 
> > > > That works for 600dpi laser printers.  When you print the QR-code with
> > > > a 300dpi label printer you can't reliably scan it, not even when you
> > > > make the QR-code 1x1" in size.
> > > > 
> > > > Perhaps that's not a reasonable size?
> > > 
> > > Perhaps height and width are chosen improperly. An image some percents
> > > smaller may be sharper.
> > 
> > What size do you consider reasonable?
> 
> It seems you expect some number that you can use for any QR code. There 
> is no size that fits for all codes.

It's because you said: "I believed that 300dpi is high enough
resolution for QR-codes of reasonable size if source image has proper
quality." that I keep asking what you consider a reasonable size.

> Out of curiosity I tried to scan a QR code printed on a thermal printer 
> (so likely having ~200dpi resolution) having size of approximately 0.8in 
> and 50 pixels (modules) per inch. It encodes a 69 bytes long link. 
> Likely the same code scaled to 0.4in will still work, but I would prefer 
> to avoid it, 0.6in should be more reliable. On your 300dpi printer this 
> particular QR code may be printed e.g. at ~(0.8/1.5)in.

Did you successfully scan it?

> > [...]
> > The QR-code must fit on the label, plus some text.  The labels are
> > 50x35mm in size.
> 
> It limits amount of information you may put into QR codes. You can still 
> choose to use e.g. 4,5,6, etc. printer dots per QR code module.

How can I choose that?  I don't know that there would be an option
with pdflatex or pdf or the printer driver that would let me choose
how many dots per module the printer puts onto the label.

> > When I zoom in on QR-codes in a PDF viewer, they don't get blurry.
> > Perhaps the pst-barcode package uses vector graphics?
> 
> Nice, however you have to adjust size to avoid blurring.

How do you mean?  I thought vector graphics don't blur when scaled.



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