I'd report upstream on the kernel if it's happening on the exact same OS fine on older kernel driver.

    Justin Do you know of a good and simple online guide about the procedure? To be honest, I've never filed a bug before. I switched to linux just about 1 1/2 years ago. 😉

        soluser This verifies what Justin had said, this must be a regression since kernel 4.19.

        By the way, can you please send me a copy of linux-current-4.18.5-x86-64.eopkg (or something along those lines)?
        It should be in /var/cache/eopkg/packages/.

        I need to test for regressions with wireless networking stability (probably due to power management), and I do not seem to have the package on my system anymore.

              moriel5 I'm sorry moriel5 but on my system that directory is is empty. Probably because I reinstalled solus just a few days back.

                Looks like the same issue I had. I was able to resolve the issue by setting the pcie_aspm.policy kernel parameter. The r8169 driver introduced power management from kernel 4.19 which doesn't work well with some hardware configurations. Here's the link to the post of my results following guidance from the kernel driver maintainer:
                https://lore.kernel.org/netdev/CAMLO_R5m+tFa2yzeMbacROrFirwWN+zCUVAbDd864RHVMNe08Q@mail.gmail.com/

                  pceiley Thanks. I tried the various pcie_aspm settings but sadly to no effect. Generally speaking there seem to be problems with the realtek 8169 kernel module across all distributions since the introduction of kernel 4.19. Switching to the 4.9 LTS kernel solved my problem for now.

                      Was worth a shot. Sorry it didn't help you.

                      soluser My Ethernet adapter is (not just the driver, but the actual hardware model) the R8169, and while it appears to work well (I still do not have a proper setup to stress check it), since kernel 4.19 it does take much longer for it to connect and disconnect (I have to turn networking off completely when I need it to connect on time to bricked devices I am repairing).
                      Generally speaking, since kernel 4.19 I have been having networking issues left and right (WiFi is unstable, on my desktop, laptop, and my sister's laptop, regardless of what WiFi adapter is inserted (have checked the Intel 9260, 7260 (Wireless-AC variant), 3165, Qualcomm/Atheros QCA9377, and Realtek RTL8821AE)).
                      It appears that kernel 5.1 will have additional fixes for these issues, hopefully they get backported.