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? > 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. -- Ben Hutchings The world is coming to an end. Please log off.
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