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[Linux-fbdev-devel] Matrox G450 fbdev, v4l and TV-OUT question
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From: nihil <ni...@fr...> - 2004-02-18 22:36:39
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Hi! I found out, that up to the kernel version 2.6.2 the setting of the bright and contrast for the Matrox G450 TV-OUT doesn't work. However it worked in 2.4.xx and also in 2.6.1. I can get the values with: ~> v4lctl -c /dev/fb0 list attribute | type | current | default | comment -----------+--------+---------+---------+------------------------ norm | choice | (null) | (null) | input | choice | (null) | (null) | bright | int | 127 | 127 | range is 0 => 780 contrast | int | 127 | 127 | range is 0 => 1023 color | int | 165 | 165 | range is 0 => 255 hue | int | 0 | 0 | range is 0 => 255 test outpu | bool | off | off | But if I try to set a value, I get only an error message: ~> v4lctl -c /dev/fb0 bright 600 ioctl: VIDIOC_S_CTRL(id=9963776;value=600): Inappropriate ioctl for device It is also the same for the contrast: ~> v4lctl -c /dev/fb0 contrast 800 ioctl: VIDIOC_S_CTRL(id=9963777;value=800): Inappropriate ioctl for device What could be the problem? What is changed in the kernel from 2.6.1 to 2.6.2, that causes this problem? If this doesn't work anymore, how can I change the bright/contrast for the TV-OUT on the Matrox G450 card? Thank you in advance! nihil |