Messages in this thread | | | Date | Tue, 08 Apr 2008 21:56:59 -0700 | From | Justin Madru <> | Subject | Re: [Regression: 2.6.25-rc5: Blank Screen: Intel 945] |
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Jesse Barnes wrote: > Yeah, seems pretty weird. Given that you see it w/o the fb stuff loaded as > well and we still have a few open bugs against the intel X driver regarding > VT switch & mode programming, I don't think this is a real kernel regression. > It's more likely that some timing or memory layout changed subtly and is > causing to to hit one of our existing bugs more frequently that you did > before. Can you file a bug against the intel X driver at > bugs.freedesktop.org so we can track it there? Unless we can find a way to > reproduce it reliably it'll probably take a long time to fix, but we don't > want to lose it either...
Well, I'll file a bug on bugs.freedesktop.org, but if you don't think it's a kernel regression then I'll wait until the final release of 2.6.25 comes out (unless you _really_ need me to file it sooner).
I still think it's somehow related to something that changed in the kernel from v24 to v25 because I've never had it happen with a kernel version less that 2.6.25. You say it's a timing issue; I've searched and found two things that have changed in v25: Preemptive RCU and I/O Port Delay.
I've enabled both preemptive RCU and no I/O port delay. I've recompiled with both disabled and found that the blank screen _still_ happens. So, I'm figuring that _maybe_ by adding these options the kernel developers needed to change something that exposes something related to the intel X.org driver that's no longer necessarily true (or something like that - do you get what I'm trying to say).
This is what I have in my config: > CONFIG_PREEMPT_RCU=y > CONFIG_IO_DELAY_NONE=y
By the way is the intel driver that you work on the same that's enabled by: > CONFIG_AGP_INTEL=m > CONFIG_DRM_I915=m
Or is there another X.org intel driver? And if so how are they (agp/drm/X.org) related?
Justin
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