linux-kernel - Re: [REGRESSION] [BISECTED] Unable to use 3D with Radeon 2100 and UI freezes with Firefox

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Date:	Sat, 30 Jul 2011 09:10:22 +0100
From:	Dave Airlie <airlied@...il.com>
To:	Rogério Brito <rbrito@....usp.br>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	Rogério Theodoro de Brito <rbrito@...il.com>
Subject: Re: [REGRESSION] [BISECTED] Unable to use 3D with Radeon 2100 and UI
 freezes with Firefox

On Sat, Jul 30, 2011 at 8:42 AM, Rogério Brito <rbrito@....usp.br> wrote:
> Hi once again, but things are not good with any kernel past the reworked IRQ
> stuff.
>
> On 2011-07-25, at 05:08, Dave Airlie wrote:
>
>> 2011/7/24 Rogério Brito <rbrito@....usp.br>:
>>>
>>> After experiencing problems with many post 2.6.38 kernels with X when I
>>> used
>>> Firefox to see any webpage that used some of the new HTML5 features
>>> (Firefox
>>> freeze completely X and I could only log in remotely with SSH), I took
>>> some
>>> time to see where things went wrong and, to cut a long story short, I
>>> bisected the kernel and I found that a commit of yours was the first one
>>> that introduced a problem with my system:
>>
>> Can you attach /proc/interrupts as well please.
>
> It seems that the radeon thing is just one of the manifestations of the
> problem.
>
> Today, I noticed another bad symptom, when I accidentally booted with kernel
> 3.0 (I have many kernels in GRUB2): I printed a LaTeX document with only 2
> pages of pure text.  My printer is an inkjet printer connected via USB to my
> computer and it took about 6 minutes to print those 2 pages. The printer
> head moved printing something, then it paused a bit, then it printed some
> more, then it paused some more etc.
>
> I just rebooted with 2.6.38 and the very same document was printed in, like,
> 15 seconds...
>
> So, is there anything that I could do to rectify this situation? I can give
> you loads of dumps from here, as long as you tell me what would be useful.
>

Well I was hoping Thomas would help debug this, but he's gone on
holidays, I'll try and take a look next week.

but I've no real idea about the irq subsystem.

Dave.
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