Re: HauppaugeTV-quadHD DVB-T mpeg risc op code error

[Sean Young <sean@mess.org>]

Hi,

On Thu, Apr 23, 2020 at 05:32:32AM -0700, Rolf Pedersen wrote:
> Hi Folks,
> I just subscribed after having trouble with this card that worked for 3
> years on Skylake i5-6500 but stopped tuning when I moved it to AMD Ryzen 5
> 3400G machine.  I found the workaround in the archived thread referenced in
> the subject line and don't know any way to reply directly to it:
> https://www.spinics.net/lists/linux-media/msg114563.html
> 
> My card is ATSC as on this page:
> https://www.kernel.org/doc/html/v4.10/media/v4l-drivers/cx23885-cardlist.html
> 57     Hauppauge WinTV-QuadHD-ATSC     0070:6a18, 0070:6b18
> 
> and
> 
> [rolf@x570i coup]$ lspcidrake -v | grep Conexant
> cx23885         : Conexant Systems, Inc.|CX23887/8 PCIe Broadcast Audio and
> Video Decoder with 3D Comb [MULTIMEDIA_VIDEO] (vendor:14f1 device:8880
> subv:0070 subd:6b18) (rev: 04)
> cx23885         : Conexant Systems, Inc.|CX23887/8 PCIe Broadcast Audio and
> Video Decoder with 3D Comb [MULTIMEDIA_VIDEO] (vendor:14f1 device:8880
> subv:0070 subd:6a18) (rev: 04)
> 
> Neither scan, dvbscan, nor w_scan2, nor Kaffeine TV, while finding working
> frequencies, could divulge any services.  The workaround was in the
> referenced post:  cx23885.debug=8
> 
> I've seen another report of a different kernel option that worked on Ryzen:
> |cx23885.dma_reset_workaround=2 here:
> https://www.dslreports.com/forum/r32639318-SFF-3400G-build#32640298
> 
> Ok.  Just wanted to join the chorus with a *metoo* in case I can provide
> some (guided) forensics.

So there is a commit for a related issue:

https://git.linuxtv.org/media_tree.git/commit/?id=4bd46aa0353e022c2401a258e93b107880a66533

That is kernel v5.0 and higher. So:

1. What kernel are you using?

2. What is the full lspci -n of your machine?

Thanks,

Sean