https://bugzilla.kernel.org/show_bug.cgi?id=207219 --- Comment #5 from William Bader (williambader@xxxxxxxxxxx) --- Thanks for looking at it. >Try starting with a vanilla (bad) kernel and reverting commit bd0e6c9614b9; >let's see if that fixes the camera problem. Yes, that fixed the camera problem. What is the next step? >it is a bug in the camera, not in the kernel It wouldn't surprise me. Here is what I did: >$ git clone --branch linux-5.4.y >https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4 >$ git status > On branch linux-5.4.y > Your branch is up to date with 'origin/linux-5.4.y'. > nothing to commit, working tree clean >$ git log --oneline -n1 HEAD > bc844d58f697 (HEAD -> linux-5.4.y, tag: v5.4.32, origin/linux-5.4.y) Linux > 5.4.32 >$ # <- build, install, and confirm that the webcam does not work >$ git log --oneline -n1 bd0e6c9614b9 > bd0e6c9614b9 usb: hub: try old enumeration scheme first for high speed > devices >$ git revert bd0e6c9614b9 >$ git status > On branch linux-5.4.y > Your branch is ahead of 'origin/linux-5.4.y' by 1 commit. > (use "git push" to publish your local commits) > nothing to commit, working tree clean >$ git diff v5.4.32 | grep '^[+-]' >--- a/Documentation/admin-guide/kernel-parameters.txt >+++ b/Documentation/admin-guide/kernel-parameters.txt >- scheme, applies only to low and full-speed devices >- (default 0 = off). >+ scheme (default 0 = off). >--- a/drivers/usb/core/hub.c >+++ b/drivers/usb/core/hub.c >- int quick_enumeration = (udev->speed == USB_SPEED_HIGH); >- return USE_NEW_SCHEME(retry, old_scheme_first_port || old_scheme_first >- || quick_enumeration); >+ return USE_NEW_SCHEME(retry, old_scheme_first_port || >old_scheme_first); >$ # <- the commit makes quick_enumeration use the new scheme before >"[7cbdf96cda1fbffb17ec26ea65e1fe63c9aed430] usb: missing parentheses in >USE_NEW_SCHEME" >$ # <- and the old scheme after. >$ make mrproper # <- was this needed? >$ cp ../config .config # <- my saved config based on Fedora's >$ uemacs .config # bump CONFIG_LOCALVERSION to ".localversion13" >$ cp -p .config ../config-`grep Linux .config | head -1 | awk '{print >$3}'`-`grep -i CONFIG_LOCALVERSION= .config | sed -e 's/.*=".//' -e 's/"//g'` >$ make oldconfig >$ time make >$ time make binrpm-pkg >$ sudo dnf install >kernel-5.4.32.localversion13_00001_g0dfde04ccc52-1.x86_64.rpm ><- reboot >$ uname -r >5.4.32.localversion13-00001-g0dfde04ccc52 ><- the webcam works -- You are receiving this mail because: You are watching the assignee of the bug.
