linux-kernel - Re: kernel command line parameter parsing is broken at drm_kms_helper.edid

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Message-ID: <50FD59F7.7000308@palosanto.com>
Date:	Mon, 21 Jan 2013 10:08:39 -0500
From:	Alex Villacís Lasso 
	<a_villacis@...osanto.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: kernel command line parameter parsing is broken at drm_kms_helper.edid_firmware
 when compiling under Fedora 18

El 19/01/13 20:21, Alex Villacís Lasso escribió:
> I am having this strange issue. My computer has a LCD display that does not send any EDID, and therefore I need the command parameter "drm_kms_helper.edid_firmware=edid/1280x1024.bin" In Fedora 16, the stock kernel does not have 
> CONFIG_DRM_LOAD_EDID_FIRMWARE set. Therefore I compiled my own kernel from vanilla sources, and the parameter worked. I have just now upgraded to Fedora 18. The new stock kernel is supposed to have CONFIG_DRM_LOAD_EDID_FIRMWARE set, but when I boot with 
> the drm_kms_helper parameter, I get a message "drm_kms_helper: Unknown parameter `bin'". I thought this was a kernel bug caused by some patch in the stock kernel, so I filed https://bugzilla.redhat.com/show_bug.cgi?id=901899 , and then proceeded to 
> compile 3.8-rc4 from vanilla sources. However, I am surprised to find that the vanilla sources, when compiled under Fedora 18, exhibit the same bug. Has anyone seen a situation like this? Is this a possible compiler bug in Fedora 18? A grub2 bug? 
> Apparently the kernel is misparsing the commandline parameter and thinks "bin" is the module parameter, not "edid_firmware".
BTW, I have CONFIG_DYNAMIC_DEBUG=y in my kernel config, and I tried adding dyndbg="file params.c +p" to the kernel command line, but I see no additional debug output that might point out what is happening.
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