On Saturday 05 July 2003 17:06, C Hamel wrote:

On Saturday 05 July 2003 08:37, Richard wrote:

...

Hi, I was monitoring this thread since I have a similar problem with my Compaq 1260 Laptop. DMA worked until I upgraded to SuSE 8.2. DMA still works under Windows. Did you ever find a solution to the problem, if yes, what was it?

Thanks, Richard

No solution, as yet. Seems DMA can be enable, somehow, upon bootup but I have yet to spend much time looking to see where that might be.

Yast>Hardware>IDE DMA Mode

-- ...CH SuSE On A Toshi Is All U Need 2 Drive U Crazy. Linux user# 313696 Linux box# 199365

-- Sweet moderation Heart of this nation Desert us not We are between the wars - Billy Bragg

On Saturday 05 July 2003 12:03 pm, Richard wrote:

On Saturday 05 July 2003 11:12 am, Dylan wrote:

...

On Saturday 05 July 2003 17:06, C Hamel wrote:

...

On Saturday 05 July 2003 08:37, Richard wrote:

...

Hi, I was monitoring this thread since I have a similar problem with my Compaq 1260 Laptop. DMA worked until I upgraded to SuSE 8.2. DMA still works under Windows. Did you ever find a solution to the problem, if yes, what was it?

Thanks, Richard

No solution, as yet. Seems DMA can be enable, somehow, upon bootup but I have yet to spend much time looking to see where that might be.

Yast>Hardware>IDE DMA Mode

My IDE interface is an OPTI 82C825. No matter what I put in the IDE Setup for IDE DMA Mode I get the same error message " Error occurred while activating changes." I've gone into Grubb and entered the supposedly correct info but no joy from there either! The lack of DMA makes the laptop almost unuseably slow!

So far I havent found out enough to let me look into the innards of the mode.

thanks for the response. Richard

I just found the following message from Alan Cox in the Linux kernel Archives which may tell the tale:

I checked my logs and found that the 2.4.21 kernel use E-IDE version 7.00beta[34]-.2.4 and the 2.4.20 one use version 6.31.

Looks like something went wrong in the IDE code regarding DMA settings ?

Here is the output from 'lspci' for my IDE controler (Toshiba Satellite 2540CDT):

It used to be caught by the generic DMA driver that would just run with BIOS settings. This approach unfortunately also tended to grab devices that didn't work with just BIOS settings so I took it out and just left a table of known OK devices. I'll add the toshiba one back and I've also pinged Toshiba to see if they will give me the docs to support it properly. Alan I guess we should be talking to Alan to get the support back for our respective controllers. RA -

On Saturday 05 July 2003 12:56 pm, Charles Philip Chan wrote:

On Sat, 5 Jul 2003 12:03:56 -0500

Richard wrote:

...

My IDE interface is an OPTI 82C825. ... So far I havent found out enough to let me look into the innards of the mode.

OK, I did a little googling:

http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&threadm=2003051 2045006%241339%40gated-at.bofh.it&rnum=3&prev=/groups%3Fq%3DOPTI%2B82C825%2B linux%2Bdma%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26sa%3DN%26tab%3Dwg

it looks like the DMA for the OPTI 82C825 is broken in 2.4.20. According to the thread, it might have been fixed in 2.4.21. You can try upgrading to a Mantel kernel.

Charles Thanks Charles,

I googled a bit and found the message from Alan Cox. Just got onto downloading the 2.4.21 Mantel kernel and will try it in about 15 minutes when the download is done, then will give an update to this. Regards, Richard

On Sat, 5 Jul 2003 14:38:26 -0500 Richard wrote:

Installed the Mantel 2.4.21-4 kernel. Does not fix my problem. Still no DMA on the OPTI 82C825. Dont know if it fixed the Toshiba though.

You can try a vanilla 2.4.21 kernel to see if some of SuSE's patches broke it. Don't forget to apply the TIOCGDEV patch. Charles -- "Nature abhors a Vacuum" -- Brian Behlendorf on OSS (Open Sources, 1999 O'Reilly and Associates)