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@xxxxxxxxx>
> 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@xxxxxxxxx>
> 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@xxxxxxxxx>
> Signed-off-by: Dave Airlie <airlied@xxxxxxxxx>
>
> ===== 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@xxxxxxxxxxxxxxxxxx>
> 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@xxxxxxxxxxxxxxxxxx>
>
>
> 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
========================================================================
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