linux-kernel - Re: [3.0-rc1] i915: blank screen on Lenovo Ideapad U160

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 for Android: free password hash cracker in your pocket

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

Message-ID: <alpine.DEB.2.00.1105311406210.5012@localhost6.localdomain6>
Date:	Tue, 31 May 2011 14:08:48 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...shcourse.ca>
To:	Dirk Gouders <gouders@...bocholt.fh-gelsenkirchen.de>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [3.0-rc1] i915: blank screen on Lenovo Ideapad U160

On Tue, 31 May 2011, Dirk Gouders wrote:

> Hello,
>
> I tested 3.0.0-rc1 on my notebook which has never been the best friend
> of the i915 driver.  With linux-2.6.38-gentoo-r4 it has the problem
> that the screen remains blank after the lid is closed and reopened, but
> that problem I can live with.  With 3.0.0-r1 I am back to a former
> problem that the screen goes (and remains) blank while booting.
>
> The next step I will do is to test linux-2.6.39-gentoo, probably I
> did not notice information that I have to adjust boot parameters or the
> kernel config?

  based on my having lived through the i915 "black screen of death",
pulling out my handy "git bisect" and with advice from chris wilson,
these days, i simply apply this patch to the source:

diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index d2c7104..a1a5d03 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -152,6 +152,8 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
 	struct opregion_asle *asle = dev_priv->opregion.asle;
 	u32 max;

+return ASLE_BACKLIGHT_FAILED; // rday
+
 	if (!(bclp & ASLE_BCLP_VALID))
 		return ASLE_BACKLIGHT_FAILED;


  i tried taking it out a couple of times and immediately got the same
i915-related problem so until i hear differently, the patch stays in.

rday

-- 

========================================================================
Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
========================================================================
--
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/