one more observation which should nail things down: On Thu, 27 Jan 2011, Robert P. J. Day wrote:
> ok, i'm getting different results from this morning, not sure why, > but i'm fairly confident i've isolated it to this extent. here's the > salient part of the git log i'm looking at: > > ===== git log ===== > > commit abb72c828878a2c69b2cfb33ac30007c8ecd735e > Merge: 58bbf01 8e934db > Author: Dave Airlie <airlied at gmail.com> > Date: Tue Jan 25 08:41:58 2011 +1000 > > Merge branch 'drm-intel-fixes-2' of > ssh://master.kernel.org/pub/scm/linux/kernel/g > > * 'drm-intel-fixes-2' of > ssh://master.kernel.org/pub/scm/linux/kernel/git/ickle/dr > drm/i915: Prevent uninitialised reads during error state capture > drm/i915: Use consistent mappings for OpRegion between ACPI and i915 > drm/i915: Handle the no-interrupts case for UMS by polling > drm/i915: Disable high-precision vblank timestamping for UMS > drm/i915: Increase the amount of defense before computing vblank > timestamps > drm/i915,agp/intel: Do not clear stolen entries > Remove MAYBE_BUILD_BUG_ON > BUILD_BUG_ON: make it handle more cases > module: fix missing semicolons in MODULE macro usage > param: add null statement to compiled-in module params > module: fix linker error for MODULE_VERSION when !MODULE and > CONFIG_SYSFS=n > module: show version information for built-in modules in sysfs > selinux: return -ENOMEM when memory allocation fails > tpm: fix panic caused by "tpm: Autodetect itpm devices" > TPM: Long default timeout fix > trusted keys: Fix a memory leak in trusted_update(). > keys: add trusted and encrypted maintainers > encrypted-keys: rename encrypted_defined files to encrypted > trusted-keys: rename trusted_defined files to trusted > drm/i915: Recognise non-VGA display devices > ... > > commit 58bbf018a70c562437eeae121a5d021ba7fe56a5 > Author: Alex Deucher <alexdeucher at gmail.com> > Date: Mon Jan 24 17:14:26 2011 -0500 > > drm/radeon/kms: add new radeon_info ioctl query for clock crystal freq > > Needed for timer queries in the 3D driver. > > Signed-off-by: Alex Deucher <alexdeucher at gmail.com> > Signed-off-by: Dave Airlie <airlied at gmail.com> > > ===== git log ===== > > now: > > * commit 58bbf018 appears to be fine, boots reliably > * commit 8e934dbf causes black screen issue > > as you can see, rather than test the *merge* above, i decided to back > up one level and test the commit that was part of that merge, and it > failed. is this helpful? here's the log entry: > > commit 8e934dbf264418afe4d1dff34ce074ecc14280db > Author: Chris Wilson <chris at chris-wilson.co.uk> > Date: Mon Jan 24 12:34:00 2011 +0000 > > drm/i915: Prevent uninitialised reads during error state capture > > error_bo and pinned_bo could be used uninitialised if there were no > active buffers. > > Caught by kmemcheck. > > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk> > > > i'm going to go on and test the merge itself, abb72c82, since i > thought that was working fine earlier today. but you can see which > commit now seems to fail. does this make any sense? i did indeed test commit abb72c82 (the merge of the above), and it failed. not sure why i posted earlier today that it worked, i must have built something incorrectly. so, in conclusion: * commit 58bbf018 appears to be fine, boots reliably * commit 8e934dbf causes black screen issue * commit abb72c82 also causes black screen issue and on that note, signing off for the evening. rday -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================