2.6.0-test7: change in color depth of /dev/video0

2.6.0-test7: change in color depth of /dev/video0

[Dick Streefland]

Since linux-2.6.0-test7, xawtv complains about a color depth mismatch,
and gives me a black screen:

$ xawtv               
This is xawtv-3.72, running on Linux/i686 (2.6.0-test7)
WARNING: v4l and x11 disagree about the color depth
WARNING: fbuf.depth=24, x11 depth=16
WARNING: Is v4l-conf installed correctly?
WARNING: overlay mode disabled

With linux-2.6.0-test6 and earlier kernel, xawtv used to work just fine.
The output of v4l-conf has not changed:

$ v4l-conf
v4l-conf: using X11 display :0.0
dga: version 2.0
mode: 1280x1024, depth=16, bpp=16, bpl=2560, base=0xe8041000
/dev/video0 [v4l2]: ioctl VIDIOC_QUERYCAP: Invalid argument
/dev/video0 [v4l]: configuration done

Here are the boot messages:

Linux video capture interface: v1.00
bttv: driver version 0.9.12 loaded
bttv: using 8 buffers with 2080k (520 pages) each for capture
bttv: Host bridge needs ETBF enabled.
bttv: Bt8xx card found (0).
bttv0: Bt878 (rev 2) at 0000:00:10.0, irq: 10, latency: 32, mmio: 0xec100000
bttv0: detected: Hauppauge WinTV [card=10], PCI subsystem ID is 0070:13eb
bttv0: using: Hauppauge (bt878) [card=10,autodetected]
bttv0: enabling ETBF (430FX/VP3 compatibilty)
bttv0: Hauppauge/Voodoo msp34xx: reset line init [5]
bttv0: Hauppauge eeprom: model=61344, tuner=Philips FM1216 (5), radio=yes
bttv0: using tuner=5
bttv0: i2c: checking for MSP34xx @ 0x80... found
bttv0: i2c: checking for TDA9875 @ 0xb0... not found
bttv0: i2c: checking for TDA7432 @ 0x8a... not found
bttv0: registered device video0
bttv0: registered device vbi0
bttv0: registered device radio0
bttv0: PLL: 28636363 => 35468950 .. ok
msp34xx: init: chip=MSP3415D-A2 +nicam +simple
msp3410: daemon started
registering 0-0040
tvaudio: TV audio decoder + audio/video mux driver
tvaudio: known chips: tda9840,tda9873h,tda9874h/a,tda9850,tda9855,tea6300,tea6420,tda8425,pic16c54 (PV951),ta8
SAA5249 driver (SAA5249 interface) for VideoText version 1.7
tuner: chip found @ 0xc2
tuner: type set to 5 (Philips PAL_BG (FI1216 and compatibles))
registering 0-0061

-- 
Dick Streefland                    ////               De Bilt
dick.streefland@xs4all.nl         (@ @)       The Netherlands
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Re: 2.6.0-test7: change in color depth of /dev/video0

[Dick Streefland]

spam@streefland.xs4all.nl (Dick Streefland) wrote:
| Since linux-2.6.0-test7, xawtv complains about a color depth mismatch,
| and gives me a black screen:
| 
| $ xawtv               
| This is xawtv-3.72, running on Linux/i686 (2.6.0-test7)
| WARNING: v4l and x11 disagree about the color depth
| WARNING: fbuf.depth=24, x11 depth=16
| WARNING: Is v4l-conf installed correctly?
| WARNING: overlay mode disabled
| 
| With linux-2.6.0-test6 and earlier kernel, xawtv used to work just fine.
| The output of v4l-conf has not changed:
| 
| $ v4l-conf
| v4l-conf: using X11 display :0.0
| dga: version 2.0
| mode: 1280x1024, depth=16, bpp=16, bpl=2560, base=0xe8041000
| /dev/video0 [v4l2]: ioctl VIDIOC_QUERYCAP: Invalid argument
| /dev/video0 [v4l]: configuration done

Upgrading v4l-conf from version 3.72 to 3.90 (from Debian unstable)
solved the problem for me:

$ v4l-conf
v4l-conf: using X11 display :0.0
dga: version 2.0
mode: 1280x1024, depth=16, bpp=16, bpl=2560, base=0xe8041000
/dev/video0 [v4l2]: configuration done

-- 
Dick Streefland                    ////               De Bilt
dick.streefland@xs4all.nl         (@ @)       The Netherlands
------------------------------oOO--(_)--OOo------------------