Sure, I could try to do that. But just to make things clear: - The ebuilds should mention the "plugdev" group instead of the "usb" group - The wiki should use the "plugdev" group instead of the "sdr" group - The "sdr" group isn't needed at all
Did I get that right? Regards, Markus On Sat, Oct 4, 2025, at 12:00, Michael wrote: > On Friday, 3 October 2025 23:01:07 British Summer Time Javier Martinez wrote: >> El 3/10/25 a las 23:42, Markus Gustafsson escribió: >> >> > Evening! >> > >> > Tonight I've been trying to get an RTL-SDR dongle working using this wiki >> > article: https://wiki.gentoo.org/wiki/Rtl-sdr > >> > I set up everything according to the article, and then tried to run >> > 'rtl_test'. This worked fine as root, but not as my regular user. It gave >> > me the following error message: > >> > >> >> $ rtl_test >> >> Found 1 device(s): >> >> 0: �+.B�, , SN: >> >> >> >> >> >> >> >> Using device 0: Generic RTL2832U OEM >> >> usb_open error -3 >> >> Please fix the device permissions, e.g. by installing the udev rules file >> >> rtl-sdr.rules > Failed to open rtlsdr device #0. >> > >> > >> > This is despite having added my user to the 'sdr' group. I googled around, >> > but couldn't figure anything out (everybody else seems to forget about >> > the udev rule, but I didn't). Then I did the following: > >> > >> >> $ ls -la /dev/rtl_sdr >> >> lrwxrwxrwx 1 root root 15 Oct 3 23:19 /dev/rtl_sdr -> bus/usb/001/010 >> >> $ ls -la /dev/bus/usb/001/010 >> >> crw-rw---- 1 root plugdev 189, 9 Oct 3 23:19 /dev/bus/usb/001/010 >> > >> > >> > So for some reason the group is 'plugdev'. When I added my user to that >> > group everything works fine, but I don't understand why it gets added to >> > that group? Is there some kind of conflict going on here? The udev rule >> > from the article is the only udev rule I have (at least in >> > /etc/udev/rules.d). > > Gentoo uses the group plugdev to elevate privileges in order for plain users > to be able to operate on USB devices. The sdr group which the wiki page > recommends would work, if only the ebuild had created it. > >> > Mvh, >> > Markus >> > >> > >> >> Probably the some reason is policykit > > I see the ebuild mentions a group account "usb" instead of plugdev. Perhaps > it should contain a different post install message than this mentioning > plugdev instead: > =================== > [snip ...] > > pkg_postinst() { > udev_reload > elog "Only users in the usb group can capture." > elog "Just run 'gpasswd -a <USER> usb', then have <USER> re-login." > } > ===================== > > I recall the usb group was used with eudev, but I don't know if it is still > valid. > > Marcus, you could file a bug report to ask for the rtl-sdr and rtl-sdr-blog > ebuilds to mention pludev. Also the wiki page will need editing to reflect > current status. > Attachments: > * signature.asc
