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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 Public Key Server PGP Key ID: 1024D/9762755A Fingerprint: A2A1 08B7 C22C 3D06 34DB F4BC 08B3 E3D7 9762 755A -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://www.enigmail.net/ iEYEARECAAYFAlBfF1sACgkQCLPj15didVosGQCePZoUYxRox1/EnI4OWSj2/kqJ xucAn1aTvrWFNwT3d5A+TNw0kF/9V+2u =+8Kf -----END PGP SIGNATURE----- -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/505f175b.3010...@nchc.org.tw