[linux-dvb] Compro VideoMate DVB-T300 - lirc infrared remote control problems

James Lawrence james.lawrence at pobox.com
Sat Mar 4 08:05:12 CET 2006


I have an interesting problem with the infrared remote control that  
came with my TV card. Has anyone else experienced it and does anyone  
know a solution?

I press a key on the remote - let's call it A (it can be any key).
Later I press another key - let's call it B.
On the second key press, LIRC will recognize AB - ie it will repeat  
the previous key, immediately followed by the key just pressed. This  
happens regardless of the length of time between key presses, even  
overnight.

I have tried a code modification that PARTLY fixes the problem - it  
happens 100% of the time before applying the code change, and  
something like 10% of the time after applying the code change.
edit linuxtv/v4l-dvb/linux/drivers/media/video/saa7134/saa7134- 
input.c and replace
static int build_key(struct saa7134_dev *dev)
{
    struct saa7134_ir *ir = dev->remote;
    u32 gpio, data;

    /* rising SAA7134_GPIO_GPRESCAN reads the status */
    saa_clearb(SAA7134_GPIO_GPMODE3,SAA7134_GPIO_GPRESCAN);
    saa_setb(SAA7134_GPIO_GPMODE3,SAA7134_GPIO_GPRESCAN);

with
static int build_key(struct saa7134_dev *dev)
{
    struct saa7134_ir *ir = dev->remote;
    u32 gpio, data;

    /* rising SAA7134_GPIO_GPRESCAN reads the status */
    /* JAL clear it a few times in order to provide some delay */
    saa_clearb(SAA7134_GPIO_GPMODE3,SAA7134_GPIO_GPRESCAN);
    saa_clearb(SAA7134_GPIO_GPMODE3,SAA7134_GPIO_GPRESCAN);
    saa_clearb(SAA7134_GPIO_GPMODE3,SAA7134_GPIO_GPRESCAN);
    saa_clearb(SAA7134_GPIO_GPMODE3,SAA7134_GPIO_GPRESCAN);
    saa_setb(SAA7134_GPIO_GPMODE3,SAA7134_GPIO_GPRESCAN);


The number of clearbs is relevant - if I use two instead of four then  
the performance is not as good, if I use 8 I get no further  
improvement over 4. Repeating the setb makes no difference.

My computer configuration is:
AMD64 3200+  CPU
Gigabyte GA-K8NSC-939 motherboard with NFORCE3 chipset
Gentoo Linux with 2.6.15r5 kernel
   - I got the same result previously when trying with 64 bit SuSE OSS
10.0 with a 2.6.13 kernel and drivers compiled from the v4l-dvb
repository.
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