Bug#686939: linux-image-3.2.0-3-686-pae: fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing generic driver
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On 09/19/2012 11:46 AM, Ben Hutchings wrote:
> On Wed, 2012-09-19 at 10:09 +0800, Steven Shiau wrote:
>>
>> On 2012/9/16 下午 01:13, Ben Hutchings wrote:
>>> On Fri, 2012-09-07 at 19:37 +0800, Steven Shiau wrote:
>>>> Source: linux
>>>> Version: 3.2.23-1
>>>> Severity: important
>>>>
>>>> Dear Maintainer,
>>>>
>>>> When using "nomodeset" and "vga=788" in the boot parameters, the
machine hang at
>>>> "fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing
generic driver"
>>>> on a machine with Intel VGA card.
>>>> This happens no matter it's 686-pae kernel, or i486 one.
>>>> Since the Intel VGA card in very common, please consider to make
framebuffer work for KMS disabled.
>>>
>>> DRM drivers with KMS *are* framebuffer drivers. I think you mean 'keep
>>> VGA console working'.
>>>
>>>> How to reproduce this:
>>>> 1. Create a Debian live based on Sid:
>>>> http://live-build.debian.net/cgi-bin/live-build
>>>> 2. Burn the created iso on a CD, then boot it on a machine with
Intel VGA card
>>>> 3. In the 1st boot menu of isolinux, press "Tab" key to modify the
boot parameters. Just append "nomodeset vga=788", then press enter to
continue boot
>>>> 4. The above error will shown, and it just hangs there.
>>>
>>> This is really weird because i915 just shouldn't register a console at
>>> all if you do that... Ah, but xserver-video-xorg-intel still installs a
>>> configuration file which *overrides* nomodeset
>>> (/etc/modprobe.d/i915-kms.conf). (There was a very good reason for
>>> doing that in squeeze, but I think it can be dropped now.)
>>>
>>> So you could avoid installing xserver-video-xorg-intel, or empty the
>>> configuration file.
>>>
>>> Still, the kernel should be able to switch without hanging (and normally
>>> does). Does this *only* happen if you use 'nomodeset vga=788' or does
>>> it also happen if you use 'vga=788'?
>> It "only" happens when I use 'nomodeset vga=788'.
>
> Does /etc/modprobe.d/i915-kms.conf exist in the live system?
Apparently /etc/modprobe.d/i915-kms.conf is from package
xserver-xorg-video-intel, however, since the Debian live CD I created is
in for text mode, this package xserver-xorg-video-intel is not included.
Therefore no /etc/modprobe.d/i915-kms.conf in the live system.
I believe this is the same case for xserver-xorg-video-radeon,
Steven.
>
>
>> However, when using "vga=788", actually it won't work since the console
>> screen is not in the 800x600 text mode. It's in KMS mode I believe.
>
> Yes, by default i915 will load and set the screen mode immediately.
>
> Ben.
>
- --
Steven Shiau <steven _at_ nchc org tw> <steven _at_ stevenshiau org>
National Center for High-performance Computing, Taiwan.
http://www.nchc.org.tw
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