linux-kernel - Failed to query (GET_INFO) UVC control 3 on unit 1: -32 (exp. 1). with Web cam of Dell laptop

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Date:   Sat, 26 Jan 2019 11:10:35 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mario Limonciello <mario.limonciello@...l.com>
Subject: Failed to query (GET_INFO) UVC control 3 on unit 1: -32 (exp. 1).
 with Web cam of Dell laptop

Dear Linux folks,


On the Dell Latitude E7250 with Linux 4.20 (and before), Linux logs the 
messages below.

> [    7.485523] calling  uvc_init+0x0/0x1000 [uvcvideo] @ 327
> [    7.489034] uvcvideo: Found UVC 1.00 device Integrated_Webcam_HD (1bcf:28ae)
> [    7.490766] uvcvideo: Failed to query (GET_INFO) UVC control 3 on unit 1: -32 (exp. 1).
> [    7.504807] Bluetooth: hci0: Intel firmware patch completed and activated
> [    7.512637] uvcvideo 3-1.6:1.0: Entity type for entity Extension 4 was not initialized!
> [    7.512641] uvcvideo 3-1.6:1.0: Entity type for entity Extension 3 was not initialized!
> [    7.512644] uvcvideo 3-1.6:1.0: Entity type for entity Processing 2 was not initialized!
> [    7.512647] uvcvideo 3-1.6:1.0: Entity type for entity Camera 1 was not initialized!
> [    7.512781] input: Integrated_Webcam_HD: Integrate as /devices/pci0000:00/0000:00:1d.0/usb3/3-1/3-1.6/3-1.6:1.0/input/input20
> [    7.512885] probe of 3-1.6:1.0 returned 1 after 27344 usecs
> [    7.512914] usbcore: registered new interface driver uvcvideo
> [    7.512915] USB Video Class driver (1.1.1)
> [    7.512928] initcall uvc_init+0x0/0x1000 [uvcvideo] returned 0 after 26750 usecs

[…]

Suspend the system, Linux logs the similar messages.

> [  875.062715] uvcvideo: Failed to query (GET_CUR) UVC control 3 on unit 1: -32 (exp. 1).
> [  875.065380] uvcvideo: Failed to query (GET_CUR) UVC control 3 on unit 1: -32 (exp. 1).
> [  888.050306] uvcvideo: Failed to query (GET_CUR) UVC control 3 on unit 1: -32 (exp. 1).
> [  888.053142] uvcvideo: Failed to query (GET_CUR) UVC control 3 on unit 1: -32 (exp. 1).
Please find all Linux messages attached additionally to the output of 
`sudo lsusb -v -d 1bcf:28ae`.


Kind regards,

Paul


View attachment "dell-latitude-e7250–dmesg.txt" of type "text/plain" (222699 bytes)

View attachment "dell-latitude-e7250–lsusb-v-d.txt" of type "text/plain" (23990 bytes)