tvtime high CPU usage

[Krzysztof Lew]

Binary package hint: tvtime

Description: Ubuntu 10.04.1 LTS
Release: 10.04

tvtime:
  Zainstalowana: 1.0.2-5ubuntu2
  Kandydująca: 1.0.2-5ubuntu2

xorg:
  Zainstalowana: 1:7.5+5ubuntu1
  Kandydująca: 1:7.5+5ubuntu1

fglrx:
  Zainstalowana: (brak)
  Kandydująca: 2:8.723.1-0ubuntu4

fglrx/8.741

I'm using old PCI card to watch video from Composite input.
# dmesg |grep -i btt
[ 20.859216] bttv: driver version 0.9.18 loaded
[ 20.859218] bttv: using 8 buffers with 2080k (520 pages) each for capture
[ 20.859348] bttv: Bt8xx card found (0).
[ 20.859364] bttv 0000:03:05.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20
[ 20.859374] bttv0: Bt878 (rev 2) at 0000:03:05.0, irq: 20, latency: 64, mmio: 0xfdfff000
[ 20.859389] bttv0: detected: FlyVideo 98FM (LR50)/ Typhoon TView TV/FM Tuner [card=36], PCI subsystem ID is 1852:1852
[ 20.859392] bttv0: using: Lifeview FlyVideo 98FM LR50 / Typhoon TView TV/FM Tuner [card=36,autodetected]
[ 20.859393] IRQ 20/bttv0: IRQF_DISABLED is not guaranteed on shared IRQs
[ 20.859428] bttv0: gpio: en=00000000, out=00000000 in=00f4ff00 [init]
[ 20.859503] bttv0: FlyVideo Radio=yes RemoteControl=yes Tuner=5 gpio=0xf4ff00
[ 20.859504] bttv0: FlyVideo LR90=no tda9821/tda9820=no capture_only=no
[ 20.859506] bttv0: tuner type=5
[ 20.887169] bttv0: audio absent, no audio device found!
[ 20.938981] bttv0: registered device video0
[ 20.938998] bttv0: registered device vbi0
[ 20.939017] bttv0: registered device radio0
[ 20.939045] bttv0: PLL: 28636363 => 35468950 .. ok

Recently I've changed HW from Athlon Barton 2500/GForce 7600 to Athlon II X2 250 /Radeon HD 4200 and I've done fresh Ubuntu 10.04 installation. On mainboar there's integrated ATI Radeon HD 4200 chip, so I've installed proprietary drivers, from Ubuntu SW manager (ver. 8.723.1-0ubuntu4), but I've seen high CPU usage, as below:

  PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command
 1154 root 20 0 181M 68164 36612 S 84.0 3.3 37:04.28 /usr/bin/X :0 -nr -verbose -auth /var/run/gdm/auth-for-gdm-Zwxu11/database -nolisten tcp vt7
 1350 tv 20 0 40324 14436 9136 S 45.0 0.7 21:26.77 /usr/bin/tvtime

Also I see some frames are dropped, and video is not running smooth.

Then I decided to install newer driver (ver.8.741) from ATI site using ati installer. But this didn't solve problem.
I've seen similar problems from year 2006, then never nv drivers (different HW - nvidia graphics card) solved the problem.

BR,
Krzysztof