linux-kernel - i915: black screen after boot on 915GM (Linux >= 3.4-rc1)

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-next>] [day] [month] [year] [list]

Message-ID: <20140313083839.GA2396@shrek.podlesie.net>
Date:	Thu, 13 Mar 2014 09:38:39 +0100
From:	Krzysztof Mazur <krzysiek@...lesie.net>
To:	Ville Syrjälä 
	<ville.syrjala@...ux.intel.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	antti.koskipaa@...ux.intel.com, intel-gfx@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: i915: black screen after boot on 915GM (Linux >= 3.4-rc1)

Hi,

The commit 3f2dc5ac05714711fc14f2bf0ee5e42d5c08c581 (drm/i915: Fix 915GM
self-refresh enable/disable) causes strange regression on the HP Compaq
nc6120. During and after boot to framebuffer console with just LVDS
the screen is black (backlight on, but black). Starting a X server fixes
the problem. Connecting an external VGA monitor also fixes the problem.

Reverting this commit fixes the problem at least up to Linux 3.14.0-rc6.

I'm still using ACPI video problem workaround that effectively does:

 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
 {
- return acpi_video_bus_DOS(video, 0,
+ return acpi_video_bus_DOS(video, 3,
                            acpi_osi_is_win8() ? 1 : 0);
 }

in drivers/acpi/video.c.

I've added dmesgs from the last good commit and the bad commit at:
https://bugs.freedesktop.org/show_bug.cgi?id=76103

Thanks,
Krzysiek
--
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/