Hi Tom, On Wed, Jan 06, 2021 at 09:16:31AM -0700, tom@xxxxxxxxxxxx wrote: > Hi, > > An upgrade from linux-5.9.16 to linux-5.10.4 results in lirc not working > with my homebrew IR receiver. Running mode2 and pressing the same button on > the IR remote shows timing differences: > > 5.9.16 works, first few lines of output: > > pulse 2676 > space 371 > pulse 1429 > space 371 > pulse 827 > space 372 > pulse 1426 > space 372 > pulse 1425 > space 376 > pulse 1424 > space 374 > > 5.10.4 fail > pulse 2670 > space 380 > pulse 1428 > space 372 > pulse 827 > pulse 125391 <--- > space 127128 <--- > pulse 1406 > space 394 > pulse 1407 > pulse 125394 <--- > space 126726 <--- > pulse 1400 > space 398 > pulse 1406 > space 394 > pulse 801 > > The reporting of two pulses in a row as well as the large time reported make > it so the button presses are not recognized. > > Is this a known issue? No, this is not known issue. > I am a software developer and would be happy to help in any way. I can > gather more data or attempt to fix it myself. Thanks for your bug report. In 5.10, there was a change which converted the processing from nanoseconds to microsecondes, see: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=528222d853f9283110f0118dd71d9f0ad686d586 One issue has already been found in this change, which hasn't been upstreamed yet: https://patchwork.linuxtv.org/project/linux-media/patch/20210105093023.5212-1-hias@xxxxxxxxx/ Would you mind testing this patch out please? Admittedly I'm not convinced that this is the problem though. I'm not sure what is; the function frbwrite() contains two if statements to filter out noise, maybe something is wrong there. You could try by commenting those two if statements out and see if there is a problem there. Your help is appreciated! Thanks, Sean
