Bugzilla Bug 263920

I am using sys-kernel/gentoo-sources-2.6.29, KDE 4.2.1 from the portage tree,
x11-base/xorg-server-1.5.3-r5, x11-libs/libdrm-2.4.5, media-libs/mesa-7.3-r1
and x11-drivers/xf86-video-intel-2.6.3-r1. I have i915 drm module compiled
statically into the kernel, but modesetting is not enabled by default.

If I append 'i915.modeset=1' to the kernel command line, I get the framebuffer
at my native resolution, fbsplash working properly and KDM screen showing up as
expected. However, once I enter my credentials and try to log in, X locks up.

When booting without kernel modesetting, I can log in normally.

Reproducible: Always

Steps to Reproduce:
1. Have the forementioned config installed
2. Boot with modesetting enabled
3. Try to log in with KDM
Actual Results:  
Log in window disappears together with the cursor, but instead of the KDE
splash showing up, X locks up with no response to input and no HDD activity.

Expected Results:  
KDE 4.2.1 should load and the user session show up.

Portage 2.2_rc27 (default/linux/amd64/2008.0/desktop, gcc-4.3.3,
glibc-2.9_p20081201-r2, 2.6.29-gentoo-alchark-u3s x86_64)                       
=================================================================               
System uname:
Linux-2.6.29-gentoo-alchark-u3s-x86_64-Intel-R-_Core-TM-2_Duo_CPU_T7500_@_2.20GHz-with-glibc2.2.5 
Timestamp of tree: Thu, 26 Mar 2009 00:00:01 +0000                              
distcc 3.1 x86_64-pc-linux-gnu [disabled]                                       
ccache version 2.4 [disabled]                                                   
app-shells/bash:     4.0_p10-r1                                                 
dev-java/java-config: 1.3.7-r1, 2.1.7                                           
dev-lang/python:     2.5.4-r2                                                   
dev-util/ccache:     2.4-r8                                                     
dev-util/cmake:      2.6.3                                                      
sys-apps/baselayout: 2.0.0                                                      
sys-apps/openrc:     0.4.3-r1                                                   
sys-apps/sandbox:    1.6                                                        
sys-devel/autoconf:  2.13, 2.63                                                 
sys-devel/automake:  1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.2           
sys-devel/binutils:  2.19.1-r1                                                  
sys-devel/gcc-config: 1.4.1                                                     
sys-devel/libtool:   2.2.6a                                                     
virtual/os-headers:  2.6.28-r1                                                  
ACCEPT_KEYWORDS="amd64 ~amd64"                                                  
CBUILD="x86_64-pc-linux-gnu"                                                    
CFLAGS="-O2 -march=core2 -pipe"                                                 
CHOST="x86_64-pc-linux-gnu"                                                     
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config
/usr/kde/3.5/shutdown /usr/share/config /var/lib/hsqldb"                        
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/
/etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild
/etc/sandbox.d /etc/splash /etc/terminfo /etc/texmf/language.dat.d
/etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c
/etc/udev/rules.d"                                                             
CXXFLAGS="-O2 -march=core2 -pipe"                                               
DISTDIR="/usr/portage/distfiles"
FEATURES="distlocks fixpackages parallel-fetch preserve-libs protect-owned
sandbox sfperms strict unmerge-orphans userfetch"
GENTOO_MIRRORS="http://mirror.yandex.ru/gentoo-distfiles
http://distfiles.gentoo.org"
LANG="ru_RU.UTF-8"
LC_ALL="ru_RU.UTF-8"
LDFLAGS="-Wl,-O1"
LINGUAS="ru en"
MAKEOPTS="-j6 -l6"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --stats --timeout=180 --exclude=/distfiles
--exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/tmp"
PORTDIR="/usr/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="X a52 aac acl acpi alsa amd64 amr amrnb amrwb archive avahi
bash-completion berkdb bluetooth branding bzip2 cairocdparanoia cdr chm cli
consolekit cracklib crypt cups curl dbus dhcp djvu dri dts dvd dvdr dvdread
emboss encode evo exif fam fbcon ffmpeg flac foomaticdb ftp gdbm gif gimp
gnutls gpm gs gstreamer hal iconv id3tag ieee1394 imagemagick imlib ipv6
ipw3945 isdnlog java javascript jingle jpeg kipi kqemu ladspa lame laptop latex
lcms ldap libnotify lm_sensorslzo mad matroska midi mikmod mmx mmxext mng mp3
mp4 mpeg mudflap multilib musepack ncurses nls nptl nptlonly nsplugin ntp ogg
opengl openmp oscar pam pcre pdf perl plasma png ppds ppp pppd python qt-copy
qt3 qt3support qt4 quicktime rar readline reflection ru-dv samba sasl scanner
sdl session smp spell spl sse sse2 ssl ssse3 startup-notification stream svg
symlink sysfs taglib tcpd tetex theora threads tiff truetype unicode usb v4l
v4l2 vdpau vnc vorbis wifi wmf x264 xcomposite xine xml xorg xulrunner xv xvid
xvmc zeroconf zip zlib" ALSA_CARDS="hda-intel" ALSA_PCM_PLUGINS="adpcm alaw
asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa
lfloat linear meter mmap_emul mulaw multi null plug rate route share shm
softvol" APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon
authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile
authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock deflate
dir disk_cache env expires ext_filter file_cache filter headers include info
log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling
status unique_id userdir usertrack vhost_alias" ELIBC="glibc"
INPUT_DEVICES="synaptics evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz
cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="ru en"
USERLAND="GNU" VIDEO_CARDS="intel nvidia"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, FFLAGS, INSTALL_MASK,
PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS,
PORTDIR_OVERLAY

Created an attachment (id=186462) [details]
Xorg log showing the backtrace

It seems that the issue is not related to KDM, as trying to start a KDE session
directly from console by issuing `XSESSION=kde4 startx` results in the same
failure. It also looks like X actually crashes, rather than locks up (see the
log).

Created an attachment (id=186463) [details]
Log from an Xfce4 session

The issue seems not even to be specific to KDE. Here is an Xorg log from an
Xfce4 session also failing. Here I am able to see the desktop if the session is
started manually from the console, but X crashes when I try to open the menu.

Cannot reproduce the issue after adding the x11 overlay and upgrading to the
latest non-masked packages therein (including xorg-server-1.6.0 and
xf86-video-intel-2.6.99.902). Awaiting those in portage :)

I have the same problem using KDE 3.5.10.
I have ACCEPT_KEYWORDS="~x86" and no unmasked packages so everything is in the
newest version.
Enlightenment17 from enlightenment overlay works fine, no lockup.
How soon is it possible to add these packages from overlay to ~x86?

If you want to use KMS you need xf86-video-intel-2.7 driver. Once it's released
it will be available in portage, but for now you can enjoy 2.6.99.902 from the
overlay.

Beware that 2.6.99.902 is pretty busted without the rest of the patches from
the 2.7 branch. I would suggest using the -9999 ebuild and modifying it with
EGIT_BRANCH="2.7" instead.

Cheers