Public bug reported:
Hi all,
Problem:
The LED on this webcam is always turned on when connected to USB, unless some
application uses it - the behavior that is opposite to what is expected.
It was tested on Ubuntu 9.10 32 bit, kernel 2.6.31-19-generic.
lsusb shows the webcam information as follows:
ID 093a:2460 Pixart Imaging, Inc. Q-TEC WEBCAM 100
Suggested solution:
The driver for this camera is gspca_pac207 (located at
/lib/modules/2.6.31-19-generic/kernel/drivers/media/video/gspca).
In the driver source file pac207.c it can be seen that the bit 1 of the
register at 0x41 controls the LED. Looks like it was assumed that '0' at this
bit turns the light off, when actually '1' does that. After I've changed the
value of this register to the opposite, the re-compiled driver works correctly
and the LED is on only when the camera is in use.
I've attached the modified pac207.c. The diff of the changed file vs. original
is below:
272c272
< pac207_write_reg(gspca_dev, 0x41, 0x02);
---
> pac207_write_reg(gspca_dev, 0x41, 0x00);
308c308
< mode = 0x00; /* Image Format (Bit 0), LED (1), Compr. test mode (2) */
---
> mode = 0x02; /* Image Format (Bit 0), LED (1), Compr. test mode (2) */
331c331
< pac207_write_reg(gspca_dev, 0x41, 0x02); /* Turn off LED */
---
> pac207_write_reg(gspca_dev, 0x41, 0x00); /* Turn of LED */
** Affects: gspca (Ubuntu)
Importance: Undecided
Status: New
--
Webcam 093a:2460 (Pixart PAC207BCA) - inverted LED logic
https://bugs.launchpad.net/bugs/525959
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