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SubjectRe: [PATCH] drm/i915: Increase the amount of defense before computing vblank timestamps
Date
On Saturday 22 January 2011, Chris Wilson wrote:
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> ---
>
> Chris, does this help?
>

Sorry Chris, X still doesn't start with this patch applied. The symptoms are
slightly different in that the monitor doesn't go into power saving mode, but
the screen is still black and I have to recycle the power to get the machine
back.
The messages in the log file has changed though.We now have:

Jan 22 11:03:47 upstairs kernel: r8169 0000:02:00.0: eth0: link up
Jan 22 11:03:57 upstairs kernel: [drm] Initialized drm 1.1.0 20060810
Jan 22 11:03:58 upstairs kernel: pci 0000:00:02.0: PCI INT A -> GSI 16 (level,
low) -> IRQ 16
Jan 22 11:03:58 upstairs kernel: pci 0000:00:02.0: setting latency timer to 64
Jan 22 11:03:58 upstairs kernel: ioremap error for 0xbdce0000-0xbdce3000,
requested 0x10, got 0x0
Jan 22 11:03:58 upstairs kernel: [drm] Supports vblank timestamp caching Rev 1
(10.10.2010).
Jan 22 11:03:58 upstairs kernel: [drm] Driver supports precise vblank timestamp
query.
Jan 22 11:03:58 upstairs kernel: [drm] Initialized i915 1.6.0 20080730 for
0000:00:02.0 on minor 0
Jan 22 11:04:18 upstairs kernel: [drm:i915_get_vblank_timestamp] *ERROR* Invalid
crtc 0
Jan 22 11:04:18 upstairs last message repeated 8 times
Jan 22 11:04:18 upstairs kernel: [drm:i915_do_wait_request] *ERROR* something
(likely vbetool) disabled interrupts, re-enabling
Jan 22 11:04:21 upstairs kernel: [drm:i915_get_vblank_timestamp] *ERROR* Invalid
crtc 0
Jan 22 11:04:29 upstairs last message repeated 35 times
Jan 22 11:04:29 upstairs kernel: [drm:i915_do_wait_request] *ERROR* something
(likely vbetool) disabled interrupts, re-enabling
Jan 22 11:04:32 upstairs kernel: [drm:i915_get_vblank_timestamp] *ERROR* Invalid
crtc 0
Jan 22 11:05:00 upstairs last message repeated 98 times
Jan 22 11:05:00 upstairs kernel: [drm:i915_do_wait_request] *ERROR* something
(likely vbetool) disabled interrupts, re-enabling
Jan 22 11:05:03 upstairs kernel: [drm:i915_get_vblank_timestamp] *ERROR* Invalid
crtc 0
Jan 22 11:05:06 upstairs last message repeated 17 times
Jan 22 11:05:06 upstairs kernel: [drm:i915_do_wait_request] *ERROR* something
(likely vbetool) disabled interrupts, re-enabling

> If you can convert the address to a line number that would pinpoint the

Not done that before and nothing jumped out of my search on google, so how do I
go about getting the line number for you, please?

> NULL pointer exactly. Though judging by the address and position of the
> dereference a NULL crtc looks most likely.

<snip>


--
The more I see, the more I know. The more I know, the less I understand.
Changing Man - Paul Weller


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