[Bug 1885663] Re: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression
*** This bug is a duplicate of bug 1872984 *** https://bugs.launchpad.net/bugs/1872984 ** This bug has been marked a duplicate of bug 1872984 RTL8822BE [10ec:b822] network driver rtl_wifi crashes on boot in Focal Fossa 20.04 - 5.4.0-21-generic and mainline 5.7.0-050700rc1-generic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1885663 Title: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885663/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1885663] Re: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression
[Expired for linux (Ubuntu) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu) Status: Incomplete => Expired -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1885663 Title: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885663/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1885663] Re: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression
This is my first time tracking down a kernel bug, so it's taking me a little while as I learn the bisection & kernel compilation procedure. As an initial step, I have isolated the problem to something Ubuntu-specific. I have now tried running several mainline 5.4 kernels including, e.g., 5.4.17-050417-generic and found, to my surprise, the wireless signal is strong on those mainline kernels. To summarize my testing: BAD: 20.04 runs a signed Ubuntu 5.4 or 5.6 kernel GOOD: 18.04.4 (live usb) runs the default signed 5.3 kernel 20.04 runs unsigned mainline 5.3, 5.4, 5.8 kernels As a step towards a bisection, I've tried to boot a signed Ubuntu 5.3 kernel (taken from 18.04) on 20.04, but this hangs at the "Loading initial ramdisk" stage -- presumably due to some incompatibility between 18.04 and 20.04. I'll next attempt to compile the Ubuntu 5.3 kernel myself, which will hopefully boot on 20.04. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1885663 Title: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885663/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1885663] Re: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression
Can you please do a kernel bisection? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1885663 Title: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885663/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1885663] Re: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression
iw dev info *reports* the same default txpower (20.00 dBm) for all kernels. It is only the actual received signal (at the access point) that varies. I paste the output of `iw dev wlo1 info` below for 5.4 and 5.8; 5.3 is the almost the same except it lacks the multicast TXQ lines: Interface wlo1 ifindex 2 wdev 0x1 addr 74:40:bb:2e:b8:c1 ssid nullfarm type managed wiphy 0 channel 6 (2437 MHz), width: 40 MHz, center1: 2447 MHz txpower 20.00 dBm multicast TXQ: qsz-byt qsz-pkt flows drops marks overlmt hashcol tx-bytestx-packets 0 0 0 0 0 0 0 0 0 On 5.8, `set txpower auto` sets it to be 30.00 dBm (as reported by rerunning `iw dev wlo1 info`). However, this does not noticeably change the received signal strength (as there is variation in received signal, a small difference in the mean would be hard to detect). I also tried `set txpower 100` to 1.00 dBm; this also does not appear to change the received signal strength. So I suspect the txpower setting must not be getting through to the hardware. On 5.4, `set txpower auto` sets it to be 20.00 dBm (i.e., no change). Attempting to match 5.8 auto by `set txpower 3000` actually sets it to be 20.00. `set txpower 100` works but none of these changes to txpower affect the received signal strength. On 5.3, `set txpower auto` sets it to be 30.00 dBm (same as 5.8). `set txpower 100` also works but again, none of these changes affect the received signal strength. I am conducting these tests ~5m away from the access point, although through walls/floor. The 5.3 and 5.8 received signal strength is generally between -61 and -65 dBm while on 5.4 it is generally between -78 and -80 dBm. A cold boot into 5.4 does not change the behavior. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1885663 Title: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885663/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1885663] Re: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression
Please also see if cold boot helps. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1885663 Title: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885663/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1885663] Re: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression
I have the same card (RTL8822BE [10ec:b822] Subsystem [103c:831b]), but I got the same TX power for all following kernels: * 5.3.18-050318-generic * 5.4.0-39-generic * 5.6.0-1017-oem * 5.8.0-050800-generic Could you specify the steps you took, the output of `iw dev info`? Will anything change when you do `iw dev set txpower auto`? and `iw dev set txpower fixed N`, where N is the txpower at 5.3 kernel? ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1885663 Title: RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885663/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
