linux-kernel - Re: Compiled tridentfb hangs but distribution kernel works fine

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Date:	Wed, 10 Dec 2014 08:15:04 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Ondrej Zary <linux@...nbow-software.org>
Cc:	linux-fbdev@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Compiled tridentfb hangs but distribution kernel works fine

On Tue, 2014-12-09 at 22:33 +0100, Ondrej Zary wrote: 
> Hello,
> I'm doing some work on tridentfb driver but encountered a weird problem.
> 
> When I compile custom kernel with tridentfb, it hangs with Blade3D card (ID 
> 0x9880) in blade_image_blit(). The screen is blank with some artifacts and 
> machine does not respond to ping or keyboard. However, it can be rebooted by 
> Alt+SysRq+B. It works fine with other cards (3DImage 9750 and CyberBlade XP) 
> with no blit implementation. Commenting out contents of blade_image_blit() 
> function makes the hang go away (nothing useful on the screen, of course).
> 
> The weird thing is that the Blade3D card works fine when I load Debian 
> kernels! Debian 3.16-0.bpo.3-686-pae works fine but when I compile 3.16 
> kernel, it hangs.
> 
> Any ideas?

I'd start by looking for what Debian changed in source and/or config.

-Mike

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