Red Hat Bugzilla – Bug 314331
X lockup on kernels after kernel-2.6.20-1.2962
Last modified: 2008-01-08 12:53:39 EST
Description of problem:
Booting kernel later than kernel-2.6.20-1.2962 results in X11 display lockup,
followed by a total sytem lockup requiring hard reboot.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.reboot with kernel-18.104.22.168-57.fc6.i686
Display locks up with vertical color bars on left and right sides.
Total system lockup.
Normal display as with older kernel-2.6.20-1.2962.fc6.i686
Created attachment 212571 [details]
/va/r/log/Xorg.0.log showing lockup
Created attachment 212581 [details]
/var.lof/Xorg.0.log from normal startup on older kernel-2.6.20-1.2962
Created attachment 212591 [details]
output from lspci
Created attachment 212601 [details]
Still broken in kernel-22.214.171.124-61.fc6.i686
The problem seems to be that 16bpp support is broken in recent kernels. I was
using 16bpp to get 1600x1200 resolution with the limited graphics memory in this
The next attached /etc/X11/xorg.conf fails at 1400x1250, but works if depth is
changed to 24 (2 places).
Created attachment 221301 [details]
/etc/X11/xorg.conf with 16bpp depth which breaks kernel
Created attachment 221761 [details]
Diff of working and broken log files
(This is a mass-update to all current FC6 kernel bugs in NEW state)
I'm reviewing this bug list as part of the kernel bug triage project, an attempt
to isolate current bugs in the Fedora kernel.
I am CC'ing myself to this bug, however this version of Fedora is no longer
Please attempt to reproduce this bug with a current version of Fedora (presently
Fedora 8). If the bug no longer exists, please close the bug or I'll do so in a
few days if there is no further information lodged.
Thanks for using Fedora!
I'm still using kernel-126.96.36.199-61.fc6.i686 on that otherwise vanilla F8 box,
because that is still the last one that works for me. I think I'm having other
problems than the one described here with the latest F8 kernels, but I'll have
to be physically there to retest and be able to recover. I'll update this when I
go in to work tomorrow.
OK, finally, I have kernel-188.8.131.52-85.fc8.i686 running on this box with a fresh
X11 config with "thousands of colors" and 1600x1200 resolution.
The new kernel was dying in grub with "No setup signature found..." because
of some old crud from 2002 in /boot. I spend the morning with a rescue boot
and, ultimately, "grub-install /dev/sda" to get it to work again. An
incremental upgrade at some point wasn't handled very well.
Anyway, the original graphics problem seems to have gone, so this bug can be