has the i915 "black screen" boot issue returned?

Robert P. J. Day rpjday at crashcourse.ca
Thu Jan 27 03:47:23 PST 2011

On Thu, 27 Jan 2011, Chris Wilson wrote:

> On Wed, 26 Jan 2011 06:37:20 -0500 (EST), "Robert P. J. Day" <rpjday at crashcourse.ca> wrote:
> >
> >   after suffering through the i915 "black screen" issue for a while,
> > it was a relief that it finally seemed to be resolved with 2.6.37 or
> > something in tha vicinity.  but i just built and booted a 2.6.38-rc2+
> > kernel on my ubuntu 10.10 system and it once again boots to a black
> > screen.
> >
> >   is this a new known issue?  has anyone else seen this?
> It all depends. There is a new ACPI backlight issue causing grief, aside
> from that and lingering issues with the legacy backlight combination mode,
> I don't think there was a new i915 KMS regression. (We had regressions
> elsewhere and finally fixed up a few old regressions for UMS and DRI1 and
> various other OOPS-on-boot. And suspend is a bit hit and miss.)
> For extra fun, it appears that sched_autocgroup can trigger a leak of
> pinned bo eventually hitting a BUG. That's one I'm keen to reproduce.
> Without knowing your chipset and seeing a dmesg, I can only guess which
> problem you are most likely to have hit.

  here's a little more info if it's helpful.  from "lspci -v":

00:02.0 VGA compatible controller: Intel Corporation Core Processor
Integrated Graphics Controller (rev 12) (prog-if 00 [VGA controller])
        Subsystem: Acer Incorporated [ALI] Device 031c
        Flags: bus master, fast devsel, latency 0, IRQ 41
        Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 3050 [size=8]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915

  also, i just verified that i have a properly booting kernel based on
this commit:

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>

i chose that commit since, right after that, there are a couple
commits that are heavily i915-related:


and those would be the next things i check.  is there any other info
you'd like to see?


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