From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugtrack@alsa-project.org Subject: [ALSA - driver 0001225]: RMS hardware input and software plaback levels are incorrectly reported under 64 bit linux Date: Sun, 3 Jul 2005 10:30:25 +0200 Message-ID: <2fbbde67cbfffadbb109a38869960a59@bugtrack.alsa-project.org> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from bugtrack.alsa-project.org (gate.perex.cz [82.113.61.162]) by alsa.jcu.cz (ALSA's E-mail Delivery System) with ESMTP id AB959193 for ; Sun, 3 Jul 2005 10:30:25 +0200 (MEST) Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org The following issue has been RESOLVED. ====================================================================== ====================================================================== Reported By: ckg Assigned To: charbonnel ====================================================================== Project: ALSA - driver Issue ID: 1225 Category: PCI - RME HDSP Reproducibility: always Severity: major Priority: normal Status: resolved Distribution: Kernel Version: 2.6.11 Resolution: fixed Fixed in Version: 1.0.9 ====================================================================== Date Submitted: 07-01-2005 20:11 CEST Last Modified: 07-03-2005 10:30 CEST ====================================================================== Summary: RMS hardware input and software plaback levels are incorrectly reported under 64 bit linux Description: I'm using the PCI HDSP with a Multiface interface, Everything appears to be correct with the audio, but the hdspmixer reports bogus valus for hardware input and software playback RMS levels. The peak leavels are correct. The problem happens when the driver is compiled into the kernel and when it is a module. I think the problem is caused because the rms regesters are positioned at a 4 byte but not an 8 byte boundary on a 32 bit system, but on a 64 bit system, they are movd back 4 bytes to an 8 byte alignment ====================================================================== ---------------------------------------------------------------------- charbonnel - 07-03-05 10:26 ---------------------------------------------------------------------- "While debuggin my guess was that running 64-bits caused the port space to be positioned at an 8 byte boundary" The values you're modifying are offsets in the iomapped card memory. They are correct wherever the memory is mapped. This has nothing to do with the platform. What's happening is that you're mixing data belonging to different channels. On those 8 bytes values, you get the most significant ones right (somehow compensating for the bug in the alsa version you're using) but the least significant have a one channels offset. For channel one, what you're reading for the least significant bytes is undefined. So it looks right, but you're loosing precision. I invite you to do some tests generating sine waves with pure-data at a given level, and comparing the values read by the card and those calculated by Fons' excellent JAAA. I also invite you to upgrade to the latest alsa version... Thomas ---------------------------------------------------------------------- charbonnel - 07-03-05 10:30 ---------------------------------------------------------------------- This is the same bug as ALSA BUG https://bugtrack.alsa-project.org/alsa-bug/view.php?id=0000801 and has been fixed in alsa 1.0.9 Issue History Date Modified Username Field Change ====================================================================== 07-01-05 20:11 ckg New Issue 07-01-05 20:11 ckg File Added: hdsp.patch 07-01-05 20:11 ckg Kernel Version => 2.6.11 07-02-05 08:42 charbonnel Note Added: 0005352 07-03-05 05:22 ckg Note Added: 0005369 07-03-05 10:26 charbonnel Note Added: 0005371 07-03-05 10:30 charbonnel Status assigned => resolved 07-03-05 10:30 charbonnel Fixed in Version => 1.0.9 07-03-05 10:30 charbonnel Resolution open => fixed 07-03-05 10:30 charbonnel Note Added: 0005372 ====================================================================== ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click