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From: Larry Finger <Larry.Finger@lwfinger.net>
To: Shubhangi Shrivastava <shubhangi.shrivastava@intel.com>,
	Jani Nikula <jani.nikula@linux.intel.com>,
	Daniel Vetter <daniel.vetter@intel.com>
Cc: intel-gfx@lists.freedesktop.org,
	LKML <linux-kernel@vger.kernel.org>,
	DRI <dri-devel@lists.freedesktop.org>
Subject: Regression in i915 in kernel 4.6.0-git - bisected to f21a21983ef13a031
Date: Thu, 26 May 2016 17:11:42 -0500	[thread overview]
Message-ID: <5747749E.8040609@lwfinger.net> (raw)

The latest mainline kernel (commit 3f59de0) shows a regression. The symptom is 
that as soon as the kernel is started, the display is blanked, and it is never 
turned on again. This problem was bisected to commit 
f21a21983ef13a031250c4c3f6018e29a549d0f1
("drm/i915: Splitting intel_dp_detect"). The adapter in question is the 
integrated graphics controller on a Toshiba Tecra A50 laptop. The output of 
"lspci -nnv" for that controller is as follows:


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 27
         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: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
         Capabilities: [d0] Power Management version 2
         Capabilities: [a4] PCI Advanced Features
         Kernel driver in use: i915
         Kernel modules: i915

If the kernel is booted with "nomodeset", the display is normal.

I will be happy to test any patches, or to answer any further questions.

Thanks,

Larry
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             reply	other threads:[~2016-05-26 22:11 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-26 22:11 Larry Finger [this message]
  -- strict thread matches above, loose matches on Subject: below --
2016-05-27 15:17 Regression in i915 in kernel 4.6.0-git - bisected to f21a21983ef13a031 Larry Finger

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