At Thu, 19 Feb 2009 16:55:39 +0000, Charlie Baylis wrote:

On Tue, Feb 17, 2009 at 01:05:46PM +0100, Takashi Iwai wrote:

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At Tue, 17 Feb 2009 11:49:17 +0000, Charlie Baylis wrote:

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Hi

Some time ago, quake3 stopped running correctly on my PC. This occured when changing kernel from 2.6.25 to 2.6.27. The symptom is that within a fraction of a second of gameplay, the game freezes. Switching to a console allows the game to be killed. I am using standard kernel.org kernels with no additional patches.

Could you check whether it happens with 2.6.29-rc5? On 2.6.29, the delayed handling is done via its own workqueue, so this might be no longer a problem.

Also you could try position_fix=1 instead of bdl_pos_adj.

The problem is likely your hardware does unreliable DMA position reporting. Detecting such a broken hardware would be possible, but it'll be a bit tricky...

I tried the latest git (shortly after 2.6.29-rc5) and I found that the same symptoms occur. This happens with the driver defaults, or with bdl_pos_adj=0, or with position_fix=1. So 2.6.29 is worse, because there seems to be no workaround.

Is there a way to find out whether my hardware really is broken? I had no problems until the bdl_pos_adj workaround/feature was added.

On 2.6.29, bdl_pos_adj=0 disables that. So it'll be a workaround for you, at least.

Takashi