linux-kernel - Re: [PATCH] drm/i915: Suppress spurious vblank interrupts

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 1 Feb 2011 19:37:09 -0800
From:	Hugh Dickins <hughd@...gle.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	Mario Kleiner <mario.kleiner@...bingen.mpg.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: Suppress spurious vblank interrupts

On Tue, Feb 1, 2011 at 11:32 AM, Jesse Barnes <jbarnes@...tuousgeek.org> wrote:

> What I find strange is that you're seeing flip pending interrupts.  Are
> your symptoms affected if you remove the
> I915_DISPLAY_PLANE_[AB]_FLIP_PENDING_INTERRUPT lines from
> I915_INTERRUPT_ENABLE_FIX at the top of i915_irq.c?

No.  The first time it looked like yes it fixed it; but when I
rebooted again, same symptoms and same underruns back: this thing is
very erratic.

> Do you see any calls to drm_mode_page_flip_ioctl() in your environment?

None at all.

Sometime I should do a bisection between v2.6.36 and v2.6.37 to see
what started the underruns; but I can't promise when "sometime" will
arrive.

Hugh
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/