Logged messages from i915 using kernel 3.19-rc4

Logged messages from i915 using kernel 3.19-rc4

[Larry Finger]

Hi,

I just discovered almost 100 of the following entries in my log:

[drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt

Those were accumulated in about 12 hours of operation. I also have one that says

i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment

The above output was in the middle of the other type.

The "lspci -nnv" stanza for the i915 is:

00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core 
Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA 
controller])
         Subsystem: Toshiba America Info Systems Device [1179:0002]
         Flags: bus master, fast devsel, latency 0, IRQ 31
         Memory at e0000000 (64-bit, non-prefetchable) [size=4M]
         Memory at d0000000 (64-bit, prefetchable) [size=256M]
         I/O ports at 4000 [size=64]
         Expansion ROM at <unassigned> [disabled]
         Capabilities: <access denied>
         Kernel driver in use: i915
         Kernel modules: i915

Please let me know of any further info that you need, or any diagnostics that I 
can add.

Thanks,

Larry
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Re: Logged messages from i915 using kernel 3.19-rc4

[Borislav Petkov]

On Tue, Jan 20, 2015 at 01:17:10AM -0600, Larry Finger wrote:
> Hi,
> 
> I just discovered almost 100 of the following entries in my log:
> 
> [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt
> 
> Those were accumulated in about 12 hours of operation. I also have one that says
> 
> i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment

I got different ones on rc5 :)

[    0.970103] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared pch fifo underrun on pch transcoder A
[    0.970107] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder A FIFO underrun

and I'm wondering whether those can be simply shut up or we can actually
do something about them...

Thanks.

-- 
Regards/Gruss,
    Boris.
--