Red Hat Bugzilla – Bug 586766
udev loads framebuffer driver in text mode (level 3) - black screen after udev stars
Last modified: 2012-08-16 18:22:38 EDT
Description of problem: For some tasks I prefer to use text mode, so my default initlevel is 3, plymouth is disabled, X starts only on demand (by startx). Bare textmode required. After switching to KMS (required by intel and nouveau), kernel loads, init starts, udev loads framebuffer driver - screen is black (powersaving mode). After blind login, video my be restored or by modprobe fbcon (horrible small chars, ...), or by startx. For radeon it was a workaround: nomodeset in kernel cmdline. For nvidia cards - fallback to nv driver. But its no workaround for intel graphics - it refuse to work w/o KMS. Version-Release number of selected component (if applicable): udev-152-0.1.20100413git it seems that some previous versions too. I detected this only when use motherboard with Intel graphics onboard. How reproducible: Always. Steps to Reproduce: 1. disable plymouth. 2. initdefault=3 3. remove nomodeset if exist 4. boot Actual results: udev loads framebuffer driver - black screen. Expected results: Bare text mode. Loading fbcon is not a solution - danger in case of framebuffer errors, bare textmode can provide better view, dont require manual font loading after manual fbcon load. It may be better to provide a switch in udev config - load/skip framebuffer+fbcon drivers. Additional info:
why don't you blacklist the framebuffer driver? # echo blacklist <driver> > /etc/modprobe.d/myblacklist.conf
most framebuffer drivers are blacklisted by default anyway... $ grep -r blacklist /etc/modprobe.d/ /etc/modprobe.d/blacklist.conf:blacklist aty128fb /etc/modprobe.d/blacklist.conf:blacklist atyfb /etc/modprobe.d/blacklist.conf:blacklist radeonfb /etc/modprobe.d/blacklist.conf:blacklist i810fb /etc/modprobe.d/blacklist.conf:blacklist cirrusfb /etc/modprobe.d/blacklist.conf:blacklist intelfb /etc/modprobe.d/blacklist.conf:blacklist kyrofb /etc/modprobe.d/blacklist.conf:blacklist i2c-matroxfb /etc/modprobe.d/blacklist.conf:blacklist hgafb /etc/modprobe.d/blacklist.conf:blacklist nvidiafb /etc/modprobe.d/blacklist.conf:blacklist rivafb /etc/modprobe.d/blacklist.conf:blacklist savagefb /etc/modprobe.d/blacklist.conf:blacklist sstfb /etc/modprobe.d/blacklist.conf:blacklist neofb /etc/modprobe.d/blacklist.conf:blacklist tridentfb /etc/modprobe.d/blacklist.conf:blacklist tdfxfb /etc/modprobe.d/blacklist.conf:blacklist virgefb /etc/modprobe.d/blacklist.conf:blacklist vga16fb /etc/modprobe.d/blacklist.conf:blacklist viafb .... so you might want the blacklist.conf file to be extended with your driver.. $ rpm -qf /etc/modprobe.d/blacklist.conf hwdata-0.229-1.fc13.noarch
Really, all are blacklisted and loaded by udev. I can disable loading by blacklist 'fb'. The same result can be achieved by 'nomodeset' (even better, in this case radeon works). But after such disabling X failed to start on intel, nouveau. The bug is not in loadding framebuffer, but in loading not in time. But what to do after X exits - framebuffer will not unloaded. I will try to configure fbcon to mimic real text mode, with in-time loading, font loading and so on.
(In reply to comment #3) > Really, all are blacklisted and loaded by udev. ?? blacklisted modules should not be loaded by udev.
It seems to udev-only or Fedora only bug. In most of modern distributives it's impossible to have both text and graph mode in one boot (except radeon). If nomodeset is given in kernel options, text mode works perfectly, but X fail to start on intel, nouveau. If nomodeset is not given in kernel cmdline, X works, but during boot framebuffer inits (as far as I researched, in udev phase, but I fail to find udev rule, which result to this phenomena). I suppose to use nomodeset on servers. In workstations with nvidia and intel it seems to unavoidable to use framebuffer. But I fail to found, how to control fb. For example, udev dont inits fonts on fb console, and have no way to control relolution. If I try to load fbcon manualy _before_ udev, all keymaps and font loaded, but a very long (2-3min) delay occured before mode changed (but udev switches modes fast).
This bug appears to have been reported against 'rawhide' during the Fedora 14 development cycle. Changing version to '14'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
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