Bug 15108

Summary:	Blank screen with KMS enabled (on clevo M5xN laptop)
Product:	ACPI	Reporter:	Jérémy Lal (kapouer)
Component:	Other	Assignee:	Zhang Rui (rui.zhang)
Status:	CLOSED PATCH_ALREADY_AVAILABLE
Severity:	normal	CC:	lenb, rjw, rui.zhang
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.32	Subsystem:
Regression:	Yes	Bisected commit-id:
Bug Depends on:
Bug Blocks:	14230
Attachments:	dmidecode clevo M550N acpidump patch: blacklist Clevo M5x0N for LVDS detection

Description Jérémy Lal 2010-01-22 20:30:39 UTC

Hi,
acpi lid status thinks it's closed when booting the laptop (every time).
- /proc/acpi/button/lid/LID/state is updated correctly when closing/opening
- it's the initial value given by acpi when powered on that is wrong
- no troubles on suspend/resume

So my workaround is to close/reopen it during before kernel loading.

I guess it could be eligible to the same fix as the one described in Bug 14957

dmidecode attached.

Regards.

Comment 1 Jérémy Lal 2010-01-22 20:31:21 UTC

Created attachment 24675 [details]
dmidecode

Comment 2 Zhang Rui 2010-01-26 08:16:14 UTC

no, this seems to be a different problem.
the laptops in that bug report can not report the correct lid state all the time.
please attach the acpidump of your laptop.

Comment 3 Jérémy Lal 2010-01-26 09:13:26 UTC

Created attachment 24713 [details]
clevo M550N acpidump

Comment 4 Zhang Rui 2010-01-27 01:28:40 UTC

Created attachment 24740 [details]
patch: blacklist Clevo M5x0N for LVDS detection

well, you're right.

The root cause of this problem is that BIOS reports incorrect(uninitialized) Lid state. I read the acpidump of your laptop and find that it's hard to fix the problem in Linux kernel, so we need the same solution as we do in bug #14957.

Patch attached. please give it a try.

Comment 5 Zhang Rui 2010-01-27 01:29:27 UTC

please re-open this bug if the patch in comment #4 doesn't work for you.

Comment 6 Rafael J. Wysocki 2010-02-05 22:29:24 UTC

Handled-By : Zhang Rui <rui.zhang@intel.com>
Patch : http://bugzilla.kernel.org/attachment.cgi?id=24740

Comment 7 Len Brown 2010-02-16 09:17:13 UTC

patch in comment #4 applied to acpi tree

Comment 8 Len Brown 2010-02-19 04:27:59 UTC

shipped in linux-2.6.33-rc8-git4
sent to linux-2.6l.32.stable

closed.

Comment 9 Jérémy Lal 2010-03-04 07:45:41 UTC

i confirm the patch is working on 2.6.33