Simple unplugging camera - unloading module - plugging camera did not work for me, at least not reproducibly.
But the following did seem to always work: (1) unplug (2) sudo modprobe -fr pwc videodev v4l2_compat_ioctl32; (3) plug (camera light stays on, and cheese would report "no device found" if we would start it, but we don't) (3) do modprobe -fr pwc videodev v4l2_compat_ioctl32;sleep 2;sudo modprobe pwc (now camera light turns off after 2 sec) (4) cheese! (ok, that's not exactly a bug fix) -- dmesg starting from step (3) follows -- [ 4541.073181] usb 2-1.3: new full speed USB device using ehci_hcd and address 37 [ 4543.216032] Linux video capture interface: v2.00 [ 4543.218184] pwc: Philips webcam module version 10.0.13 loaded. [ 4543.218186] pwc: Supports Philips PCA645/646, PCVC675/680/690, PCVC720[40]/730/740/750 & PCVC830/840. [ 4543.218188] pwc: Also supports the Askey VC010, various Logitech Quickcams, Samsung MPC-C10 and MPC-C30, [ 4543.218190] pwc: the Creative WebCam 5 & Pro Ex, SOTEC Afina Eye and Visionite VCS-UC300 and VCS-UM100. [ 4543.460587] 37:2:1: endpoint lacks sample rate attribute bit, cannot set. [ 4543.462150] 37:2:2: endpoint lacks sample rate attribute bit, cannot set. [ 4543.463206] 37:2:3: endpoint lacks sample rate attribute bit, cannot set. [ 4543.464428] 37:2:4: endpoint lacks sample rate attribute bit, cannot set. [ 4543.681308] pwc: Logitech QuickCam Pro 3000 USB webcam detected. [ 4543.681416] pwc: Registered as video0. [ 4543.693180] input: PWC snapshot button as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.3/input/input92 [ 4543.693323] usbcore: registered new interface driver Philips webcam [ 4544.694261] pwc: Failed to set video mode QSIF@10 fps; return code = -110 [ 4545.695272] pwc: Failed to set video mode QSIF@10 fps; return code = -110 [ 4545.696149] 37:2:1: endpoint lacks sample rate attribute bit, cannot set. [ 4545.703386] 37:2:1: endpoint lacks sample rate attribute bit, cannot set. [ 4552.264175] usbcore: deregistering interface driver Philips webcam [ 4552.324204] pwc: Philips webcam module removed. [ 4554.475224] Linux video capture interface: v2.00 [ 4554.477166] pwc: Philips webcam module version 10.0.13 loaded. [ 4554.477168] pwc: Supports Philips PCA645/646, PCVC675/680/690, PCVC720[40]/730/740/750 & PCVC830/840. [ 4554.477169] pwc: Also supports the Askey VC010, various Logitech Quickcams, Samsung MPC-C10 and MPC-C30, [ 4554.477171] pwc: the Creative WebCam 5 & Pro Ex, SOTEC Afina Eye and Visionite VCS-UC300 and VCS-UM100. [ 4554.477196] pwc: Logitech QuickCam Pro 3000 USB webcam detected. [ 4554.477260] pwc: Registered as video0. [ 4554.973264] input: PWC snapshot button as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.3/input/input93 [ 4554.973377] usbcore: registered new interface driver Philips webcam -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/443278 Title: Logitech QuickCam USB webcams using pwc module (Pro, 3000, 4000) do not work if connected after booting -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
