From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mga11.intel.com ([192.55.52.93]:20714 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751046AbaBZUv5 (ORCPT ); Wed, 26 Feb 2014 15:51:57 -0500 Message-ID: <530E5412.8040500@linux.intel.com> Date: Wed, 26 Feb 2014 21:52:34 +0100 From: Mark Ryan MIME-Version: 1.0 To: Laurent Pinchart , "Ryan, Mark D" CC: "Sharp, Sarah A" , Mauro Carvalho Chehab , "linux-media@vger.kernel.org" Subject: Re: Dell XPS 12 USB camera bulk mode issues References: <20140225214956.GC4035@xanatos> <4186365.nC1W9O3BqU@avalon> In-Reply-To: <4186365.nC1W9O3BqU@avalon> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-media-owner@vger.kernel.org List-ID: Hi Laurent, Thank you so much for your detailed response. On 02/26/2014 04:40 PM, Laurent Pinchart wrote: > Hi Mark, > > On Wednesday 26 February 2014 10:20:06 Ryan, Mark D wrote: >> On Tuesday, February 25, 2014 10:50 PM Sarah Sharp wrote: >>> >>> Hi Laurent and Mauro, >>> >>> Mark has running into issues with the Realtek integrated webcam on a Dell >>> XPS 12 system that uses bulk endpoints. The webcam shows visible glitches >>> with certain resolutions (stripes of frame missing, distorted images, >>> purple and green colors, blank image, or missing the bottom half of the >>> image). >> >> [Ryan, Mark D] >> >> Sarah, thanks for the introduction. >> >> I can provide a little bit more information. >> >> 1. I've tried all the UVC driver quirks but none of these seem to help. > > That was a good idea, but there's no quirk for this kind of issue I'm afraid. > >> 2. I've also run some tests with the UVC traces enabled. There are quite a >> lot of errors. I include a portion of the logs below. They were generated >> on Ubuntu 13.10 (linux 3.11.0-12) running guvcview recording YVUV 1280x720 >> at 10fps. > > You can set the trace parameter to 0x7bf in future tests to remove messages > regarding the V4L2 API calls and timestamp statistics, it will make the log > slightly more readable. > > Sarah has sent me two usbmon traces, one in a working case and the other in a > non-working case. They unfortunately look both correct to me, so I'll likely > need your help to debug this. > > Let's start with a bit of background information. I'll skip the UVC control > protocol as that's not relevant to this discussion, except to mention that UVC > uses control messages to negotiate the video format with the device, and > receives the maximum payload transfer size (more about this below) from the > device. Here's URB 61 in the non-working trace that commits the streaming > parameters to the device (the maximum payload transfer size has been retrieved > from the device previously and is committed without being modified by the > driver). > > URB Timestamp Event Address Type Direction Endpoint > 61 2558.416852 Submission 4 Control OUT 0 > > SETUP Host-to-device Class request to Interface > bRequest: SET CUR (01) > wValue: 0200 > wIndex: INTF 1 ENTITY 0 (0001) > wLength: 001a > > 26 data bytes > bmHint 0x01 > bFormatIndex 2 > bFrameIndex 3 > dwFrameInterval 333333 > wKeyFrameRate 0 > wPFrameRate 0 > wCompQuality 0 > wCompWindowSize 0 > wDelay 32 > dwMaxVideoFrameSize 115200 > dwMaxPayloadTransferSize 43008 > > You can find the script I use to decode the usbmon trace at > http://www.ideasonboard.org/uvc/usbmon.py. Run it with the -C uvc option to > decode the UVC protocol. You can also use the -a option to filter the URBs > based on the device address. > > The equivalent URB in the working case is URB 101, and contains the following > payload. > > SETUP Host-to-device Class request to Interface > bRequest: SET CUR (01) > wValue: 0200 > wIndex: INTF 1 ENTITY 0 (0001) > wLength: 001a > > 26 data bytes > bmHint 0x01 > bFormatIndex 2 > bFrameIndex 4 > dwFrameInterval 333333 > wKeyFrameRate 0 > wPFrameRate 0 > wCompQuality 0 > wCompWindowSize 0 > wDelay 32 > dwMaxVideoFrameSize 153600 > dwMaxPayloadTransferSize 43008 > > The only differences are the bFrameIndex (used to select the resolution) and > the dwMaxVideoFrameSize (the maximum size of the compressed frame, computed by > the device as a worst case estimate using the size of the frame after > decompression) values. The maximum payload transfer size is identical in the > two cases. Nothing unexpected so far. > > After those URBs the uvcvideo driver starts submitting bulk URBs and get frame > data back from the device. The device returns the following data in the first > URB for the non-working and working cases respectively. > > 16262 data bytes > 58595a63 64656667 XYZcdefg > 68696a73 74757677 hijstuvw > 78797a82 83848586 xyz‚ƒ„…† > 8788898a 92939495 ‡ˆ‰Š’“”• > > 16262 data bytes > 58595a63 64656667 XYZcdefg > 68696a73 74757677 hijstuvw > 78797a82 83848586 xyz‚ƒ„…† > 8788898a 92939495 ‡ˆ‰Š’“”• > > The first few data bytes stored in the usbmon capture look like MJPEG Huffman > table data. This is a violation of the UVC specification, the camera is > supposed to start sending frames immediately. Furthermore, every payload must > start with a UVC header, which is clearly not the case here. > > We're getting to the concept of payloads. UVC cuts frames in payloads that are > then transmitted over isochronous or bulk endpoints. Payloads have a variable > size with a fixed maximum size, and each payload starts with a UVC payload > header. When using isochronous transfers each isochronous URB contains a > single payload. When using bulk transfers payloads can be split across > multiple bulk URBs. Each isochronous URB thus starts with a UVC header, while > only the first bulk URB in a payload includes a header, the other containing > frame data only. > > UVC headers start with a byte that contains the size of the header, followed > by a byte containing the following flags. > > #define UVC_STREAM_EOH (1 << 7) > #define UVC_STREAM_ERR (1 << 6) > #define UVC_STREAM_STI (1 << 5) > #define UVC_STREAM_RES (1 << 4) > #define UVC_STREAM_SCR (1 << 3) > #define UVC_STREAM_PTS (1 << 2) > #define UVC_STREAM_EOF (1 << 1) > #define UVC_STREAM_FID (1 << 0) > > EOH stands for End-Of-Header and is in practice always set. ERR denotes an > error in the payload, STI denotes a still image (never set for video-only > devices), RES is reserved, SCR and PTS are related to timestamp information > contained in the header (the header contains 4 bytes of source clock data when > SCR is set, and 6 bytes of presentation timestamp when PTS is set), EOF stands > for End-Of-Frame and marks the last payload of a frame, and FID stands for > Frame-Identifier and toggles with every frame. > > A payload ends either when the maximum payload size has been reached, or when > a short bulk URB is transferred. Looking at the working capture trace, we get > a repeating pattern of the following URBs. > > 16384 data bytes > 0c8c026c 46e15af8 .Œ.lFáZø > 4de15a05 ffd8ffdb MáZ.ÿØÿÛ > 00430003 02020202 .C...... > 02030202 02030303 ........ > > 378 data bytes > bed94ee3 bba0acab ¾ÙNã» ¬« > b5460d1d 5422ea34 µF..T"ê4 > d995a878 89df558a Ù•¨x‰ßUŠ > ded9f309 5c11fdea ÞÙó.\.ýê > > 14 data bytes > 0c8e026c 46e1530e .Ž.lFáS. > 4ee15a05 ffd9 NáZ.ÿÙ > > The first URB starts a payload and thus contains a header, starting with 0x0c > 0x8c. This translates to 12 bytes of header data and the EOH, SCR and PTS > bits. As SCR and PTS are set the header is expected to be 2 + 4 + 6 bytes > long, which is correct. The EOF bit isn't set, so the payload isn't the last > of the frame, and the FID bit is 0. The number of bytes transferred so far > (16384) is smaller than the maximum payload size negotiated earlier, so the > payload isn't finished. > > The second URB thus doesn't start by a header as it continues the payload. It > contains frame data only. The URB is a short URB, and thus completes the > payload (but not the frame). > > The third URB starts with a 12-byte header with the EOH, SCR, PTS and EOF bits > set, and contains two more bytes of data (0xff 0xd9) that are expected at the > end of the MJPEG frame. As the EOF bit is set the frame is now complete, and > as the URB is short the payload is complete as well. > > The next three URBs are similar but have the FID header bit set this time, as > the bit is required to be toggled for every frame. The pattern then repeats. > > The non-working case has the following pattern. > > 13334 data bytes > 0c8cb210 18147994 .Œ²...y” > 1f146203 ffd8ffdb ..b.ÿØÿÛ > 00430003 02020202 .C...... > 02030202 02030303 ........ > > 14 data bytes > 0c8eb210 181472aa .Ž²...rª > 1f146203 ffd9 ..b.ÿÙ > > The first URB starts with a header but is now a short URB and thus completes > the payload. The second URB completes the frame. Nothing unexpected, the > resolution is lower so we need less URBs to transfer a frame. > > The driver should handle both cases correctly. A quick analysis also indicates > that the driver shouldn't get confused by the first incorrect URB, but I might > be wrong. > > Looking below it looks like the driver is completely desynchronized with the > payload headers. This would explain the symptoms that Sarah reported, as the > driver could then interpret data as payload headers and base its state machine > on random FID and EOF bits. > > With the information I've given you, could you try to log more information in > the driver to try and find what goes wrong ? You could for instance log the > content of each header at the beginning of the uvc_video_decode_start() > function. I can indeed. I'll get back to you in the next few days with some more detailed logs. > >> [ 80.490256] uvcvideo: Frame complete (FID bit toggled). >> [ 80.490262] uvcvideo: frame 2080 stats: 0/0/1 packets, 0/0/0 pts (!early >> !initial), 0/1 scr, last pts/stc/sof 0/2069725020/32605 [ 80.490264] >> uvcvideo: Marking buffer as bad (error bit set). >> [ 80.490606] uvcvideo: Frame complete (EOF found). >> [ 80.490942] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.490947] uvcvideo: Dropping payload (out of sync). >> [ 80.492920] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.492927] uvcvideo: Dropping payload (out of sync). >> [ 80.495352] uvcvideo: frame 2081 stats: 0/0/3 packets, 0/0/1 pts (!early >> !initial), 2/3 scr, last pts/stc/sof 2103017049/2069659484/32604 [ >> 80.495360] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.496066] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.498021] uvcvideo: frame 2082 stats: 0/0/2 packets, 1/1/2 pts (!early >> initial), 1/2 scr, last pts/stc/sof 2103148379/2103148379/32601 [ >> 80.498030] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.498033] uvcvideo: Frame complete (FID bit toggled). >> [ 80.498039] uvcvideo: frame 2083 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2103213661/2103213661/32349 [ >> 80.498042] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.500420] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.501122] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.502742] uvcvideo: Frame complete (EOF found). >> [ 80.503095] uvcvideo: frame 2084 stats: 0/0/3 packets, 1/1/2 pts (!early >> initial), 2/3 scr, last pts/stc/sof 2102754899/2069659484/32604 [ >> 80.503100] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.505510] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.505890] uvcvideo: Frame complete (EOF found). >> [ 80.506245] uvcvideo: frame 2085 stats: 0/0/2 packets, 1/1/2 pts (!early >> initial), 1/2 scr, last pts/stc/sof 2119532118/2119532118/32341 [ >> 80.506249] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.507845] uvcvideo: Frame complete (EOF found). >> [ 80.508187] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.508191] uvcvideo: Dropping payload (out of sync). >> [ 80.510747] uvcvideo: frame 2086 stats: 0/0/2 packets, 0/0/1 pts (!early >> initial), 1/2 scr, last pts/stc/sof 2137357669/2085781330/32594 [ >> 80.510752] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.511463] uvcvideo: frame 2087 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2081456144/2081456144/32784 [ >> 80.511471] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.511474] uvcvideo: Frame complete (FID bit toggled). >> [ 80.511480] uvcvideo: frame 2088 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2102493775/2102559313/33362 [ >> 80.511483] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.513895] uvcvideo: frame 2089 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2102493775/2102559313/33362 [ >> 80.513904] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.513907] uvcvideo: Frame complete (FID bit toggled). >> [ 80.513913] uvcvideo: frame 2090 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2086567773/2086502238/32605 [ >> 80.513916] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.514608] uvcvideo: frame 2091 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2086567773/2086502238/32605 [ >> 80.514617] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.514620] uvcvideo: Frame complete (FID bit toggled). >> [ 80.514626] uvcvideo: frame 2092 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2102754901/2102754901/32341 [ >> 80.514629] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.517141] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.517858] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.520396] uvcvideo: frame 2093 stats: 0/0/3 packets, 2/2/3 pts (!early >> initial), 2/3 scr, last pts/stc/sof 2098429971/2098692119/32792 [ >> 80.520404] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.520407] uvcvideo: Frame complete (FID bit toggled). >> [ 80.520413] uvcvideo: frame 2094 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2081456656/2081456656/33296 [ >> 80.520416] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.521111] uvcvideo: frame 2095 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2081456656/2081456656/33296 [ >> 80.521119] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.521122] uvcvideo: Frame complete (FID bit toggled). >> [ 80.521128] uvcvideo: frame 2096 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2102951768/2102820696/32598 [ >> 80.521131] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.523496] uvcvideo: frame 2097 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2102951768/2102820696/32598 [ >> 80.523505] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.523508] uvcvideo: Frame complete (FID bit toggled). >> [ 80.523514] uvcvideo: frame 2098 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2119794008/2119728472/32088 [ >> 80.523517] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.523831] uvcvideo: Frame complete (EOF found). >> [ 80.525463] uvcvideo: Dropping payload (out of sync). >> [ 80.526190] uvcvideo: frame 2099 stats: 0/0/2 packets, 1/1/2 pts (!early >> initial), 1/2 scr, last pts/stc/sof 96354447/97436625/437 [ 80.526199] >> uvcvideo: Marking buffer as bad (error bit set). >> [ 80.528590] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.530563] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.531249] uvcvideo: frame 2100 stats: 0/0/3 packets, 2/2/3 pts (!early >> initial), 2/3 scr, last pts/stc/sof 2102558546/2102624083/32595 [ >> 80.531258] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.531261] uvcvideo: Frame complete (FID bit toggled). >> [ 80.531267] uvcvideo: frame 2101 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2119401555/2119401555/32851 [ >> 80.531270] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.533319] uvcvideo: Frame complete (EOF found). >> [ 80.533683] uvcvideo: frame 2102 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2119401555/2119401555/32851 [ >> 80.533692] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.535641] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.536353] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.538778] uvcvideo: frame 2103 stats: 0/0/3 packets, 2/2/3 pts (!early >> initial), 2/3 scr, last pts/stc/sof 2102361937/2102361935/32591 [ >> 80.538787] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.538790] uvcvideo: Frame complete (FID bit toggled). >> [ 80.538796] uvcvideo: frame 2104 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2117435189/2100657973/32567 [ >> 80.538799] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.539116] uvcvideo: Frame complete (EOF found). >> [ 80.540751] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.540758] uvcvideo: Dropping payload (out of sync). >> [ 80.542582] uvcvideo: frame 2105 stats: 0/0/2 packets, 1/1/2 pts (!early >> initial), 1/2 scr, last pts/stc/sof 2119270481/2119336018/32850 [ >> 80.542593] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.543286] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.545268] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.547699] uvcvideo: frame 2106 stats: 0/0/3 packets, 2/2/3 pts (!early >> initial), 2/3 scr, last pts/stc/sof 2101378880/2101247806/32574 [ >> 80.547707] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.547710] uvcvideo: Frame complete (FID bit toggled). >> [ 80.547716] uvcvideo: frame 2107 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2118811466/2101903434/32840 [ >> 80.547719] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.548047] uvcvideo: Frame complete (EOF found). >> [ 80.548394] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.548401] uvcvideo: Dropping payload (out of sync). >> [ 80.550362] uvcvideo: frame 2108 stats: 0/0/2 packets, 1/1/2 pts (!early >> initial), 1/2 scr, last pts/stc/sof 2085125960/2085060423/32582 [ >> 80.550371] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.552830] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.553372] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.561825] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.562162] uvcvideo: Frame complete (EOF found). >> [ 80.562497] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.562505] uvcvideo: Dropping payload (out of sync). >> [ 80.564927] uvcvideo: frame 2109 stats: 0/0/6 packets, 3/3/4 pts (!early >> initial), 5/6 scr, last pts/stc/sof 97857347/2068480074/32842 [ >> 80.564935] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.566925] uvcvideo: frame 2110 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2069069907/2069069907/32851 [ >> 80.566934] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.566937] uvcvideo: Frame complete (FID bit toggled). >> [ 80.566943] uvcvideo: frame 2111 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2102558546/2102493009/32593 [ >> 80.566946] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.567599] uvcvideo: frame 2112 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2102558546/2102493009/32593 [ >> 80.567607] uvcvideo: Frame complete (FID bit toggled). >> [ 80.567613] uvcvideo: frame 2113 stats: 0/0/1 packets, 0/0/0 pts (!early >> !initial), 0/0 scr, last pts/stc/sof 0/0/0 [ 80.570041] uvcvideo: frame >> 2114 stats: 0/0/1 packets, 0/0/0 pts (!early !initial), 0/0 scr, last >> pts/stc/sof 0/0/0 [ 80.570050] uvcvideo: Marking buffer as bad (error bit >> set). >> [ 80.570053] uvcvideo: Frame complete (FID bit toggled). >> [ 80.570059] uvcvideo: frame 2115 stats: 0/0/1 packets, 0/0/0 pts (!early >> !initial), 0/1 scr, last pts/stc/sof 0/2068938833/32849 [ 80.570062] >> uvcvideo: Marking buffer as bad (error bit set). >> [ 80.570379] uvcvideo: Frame complete (EOF found). >> [ 80.572032] uvcvideo: frame 2116 stats: 0/0/1 packets, 0/0/0 pts (!early >> !initial), 0/1 scr, last pts/stc/sof 0/2068938833/32849 [ 80.572041] >> uvcvideo: Marking buffer as bad (error bit set). >> [ 80.572713] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.575138] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.577804] uvcvideo: frame 2117 stats: 0/0/4 packets, 2/2/3 pts (!early >> initial), 2/3 scr, last pts/stc/sof 2084667459/2084470848/32830 [ >> 80.577813] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.577816] uvcvideo: Frame complete (FID bit toggled). >> [ 80.577822] uvcvideo: frame 2118 stats: 0/0/1 packets, 0/0/0 pts (!early >> !initial), 0/1 scr, last pts/stc/sof 0/2069004371/32851 [ 80.577825] >> uvcvideo: Marking buffer as bad (error bit set). >> [ 80.578143] uvcvideo: Frame complete (EOF found). >> [ 80.580219] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.580223] uvcvideo: Dropping payload (out of sync). >> [ 80.582212] uvcvideo: frame 2119 stats: 0/0/2 packets, 0/0/0 pts (!early >> !initial), 1/2 scr, last pts/stc/sof 0/2069266518/32854 [ 80.582221] >> uvcvideo: Marking buffer as bad (error bit set). >> [ 80.582896] uvcvideo: frame 2120 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2086371163/2086371163/32604 [ >> 80.582904] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.582907] uvcvideo: Frame complete (FID bit toggled). >> [ 80.582913] uvcvideo: frame 2121 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2102951768/2102951768/32600 [ >> 80.582916] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.584748] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.586723] uvcvideo: frame 2122 stats: 0/0/2 packets, 0/0/1 pts (!early >> initial), 1/2 scr, last pts/stc/sof 2102951768/2036039771/32859 [ >> 80.586731] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.586734] uvcvideo: Frame complete (FID bit toggled). >> [ 80.586740] uvcvideo: frame 2123 stats: 0/0/1 packets, 0/0/0 pts (!early >> !initial), 0/1 scr, last pts/stc/sof 0/2052489304/32856 [ 80.586743] >> uvcvideo: Marking buffer as bad (error bit set). >> [ 80.587067] uvcvideo: Frame complete (EOF found). >> [ 80.588555] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.588564] uvcvideo: Dropping payload (out of sync). >> [ 80.590556] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.590564] uvcvideo: Dropping payload (out of sync). >> [ 80.591231] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.591239] uvcvideo: Dropping payload (out of sync). >> [ 80.593662] uvcvideo: frame 2124 stats: 0/0/4 packets, 2/3/3 pts (!early >> !initial), 3/4 scr, last pts/stc/sof 2086240088/2086240089/32601 [ >> 80.593670] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.593995] uvcvideo: Frame complete (EOF found). >> [ 80.595639] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.595646] uvcvideo: Dropping payload (out of sync). >> [ 80.596344] uvcvideo: frame 2125 stats: 0/0/2 packets, 0/0/1 pts (!early >> !initial), 1/2 scr, last pts/stc/sof 2081456144/2081456144/32784 [ >> 80.596353] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.598768] uvcvideo: frame 2126 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2086371161/2086240091/32601 [ >> 80.598776] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.598779] uvcvideo: Frame complete (FID bit toggled). >> [ 80.598785] uvcvideo: frame 2127 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2103213916/2103279453/32605 [ >> 80.598788] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.600741] uvcvideo: frame 2128 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2103213916/2103279453/32605 [ >> 80.600749] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.600753] uvcvideo: Frame complete (FID bit toggled). >> [ 80.600758] uvcvideo: frame 2129 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2102755157/2102624085/32595 [ >> 80.600761] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.601436] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.603280] uvcvideo: frame 2130 stats: 0/0/2 packets, 1/1/2 pts (!early >> initial), 1/2 scr, last pts/stc/sof 2086502237/2086502237/32605 [ >> 80.603288] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.603291] uvcvideo: Frame complete (FID bit toggled). >> [ 80.603297] uvcvideo: frame 2131 stats: 0/0/1 packets, 0/0/0 pts (!early >> !initial), 0/1 scr, last pts/stc/sof 0/2066711095/33331 [ 80.603300] >> uvcvideo: Marking buffer as bad (error bit set). >> [ 80.604922] uvcvideo: Frame complete (EOF found). >> [ 80.605261] uvcvideo: frame 2132 stats: 0/0/1 packets, 0/0/0 pts (!early >> !initial), 0/1 scr, last pts/stc/sof 0/2066711095/33331 [ 80.605270] >> uvcvideo: Marking buffer as bad (error bit set). >> [ 80.605627] uvcvideo: Frame complete (EOF found). >> [ 80.605982] uvcvideo: frame 2133 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2119532117/2119597654/32342 [ >> 80.605990] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.608029] uvcvideo: Frame complete (EOF found). >> [ 80.608384] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.608391] uvcvideo: Dropping payload (out of sync). >> [ 80.610344] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.610353] uvcvideo: Dropping payload (out of sync). >> [ 80.612192] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.612196] uvcvideo: Dropping payload (out of sync). >> [ 80.612941] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.612948] uvcvideo: Dropping payload (out of sync). >> [ 80.615462] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.615469] uvcvideo: Dropping payload (out of sync). >> [ 80.616182] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.616190] uvcvideo: Dropping payload (out of sync). >> [ 80.618717] uvcvideo: frame 2134 stats: 0/0/7 packets, 4/6/5 pts (!early >> initial), 6/7 scr, last pts/stc/sof 2102296398/2102165324/32588 [ >> 80.618726] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.619425] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.621815] uvcvideo: frame 2135 stats: 0/0/2 packets, 1/1/2 pts (!early >> initial), 1/2 scr, last pts/stc/sof 2081456656/2081456656/33296 [ >> 80.621824] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.621827] uvcvideo: Frame complete (FID bit toggled). >> [ 80.621834] uvcvideo: frame 2136 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2102820693/2102820694/32600 [ >> 80.621837] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.623785] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.626895] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.628846] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.630705] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.632698] uvcvideo: frame 2137 stats: 0/0/6 packets, 5/5/6 pts (!early >> initial), 5/6 scr, last pts/stc/sof 2102558546/2102558546/32594 [ >> 80.632706] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.632709] uvcvideo: Frame complete (FID bit toggled). >> [ 80.632715] uvcvideo: frame 2138 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2119336019/2102558802/32850 [ >> 80.632718] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.633058] uvcvideo: Frame complete (EOF found). >> [ 80.633403] uvcvideo: frame 2139 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2119336019/2102558802/32850 [ >> 80.633412] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.635832] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.637813] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.638509] uvcvideo: frame 2140 stats: 0/0/3 packets, 2/2/3 pts (!early >> initial), 2/3 scr, last pts/stc/sof 2102493009/2102493009/32593 [ >> 80.638523] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.638527] uvcvideo: Frame complete (FID bit toggled). >> [ 80.638537] uvcvideo: frame 2141 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2117435445/2100723765/32824 [ >> 80.638541] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.638817] uvcvideo: Frame complete (EOF found). >> [ 80.641019] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.641028] uvcvideo: Dropping payload (out of sync). >> [ 80.641709] uvcvideo: frame 2142 stats: 0/0/2 packets, 1/1/2 pts (!early >> initial), 1/2 scr, last pts/stc/sof 2102362191/2102493265/32847 [ >> 80.641719] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.644143] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.646129] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.646798] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.649234] uvcvideo: frame 2143 stats: 0/0/4 packets, 3/3/4 pts (!early >> initial), 3/4 scr, last pts/stc/sof 2101903432/2102034506/32844 [ >> 80.649243] uvcvideo: Marking buffer as bad (error bit set). >> [ 80.649247] uvcvideo: Frame complete (FID bit toggled). >> [ 80.649254] uvcvideo: frame 2144 stats: 0/0/1 packets, 0/0/1 pts (!early >> initial), 0/1 scr, last pts/stc/sof 2085060423/2084994887/32582 [ >> 80.649256] uvcvideo: Marking buffer as bad (error bit set). >