linux-kernel - Re: Linux 2.6.37

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Date:	Thu, 6 Jan 2011 11:48:16 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	dri-devel@...ts.freedesktop.org
Subject: Re: Linux 2.6.37

Hi,

On Tue 04-01-11 17:15:45, Linus Torvalds wrote:
[...]
> We did have another revert to fix hopefullythe last "blank screen"
> regression on intel graphics.

It seems that there is still a regression for intel graphic cards
backlight. One report is https://bugzilla.kernel.org/show_bug.cgi?id=22672.
I can reproduce the problem easily by:
xset dpms force standby; sleep 3s; xset dpms force on

backlight doesn't get up (there is really dark picture though which
doesn't get brighter by function keys which work normally) after dpms on
until I close and open lid. 

The problem wasn't present in 2.6.36

$ lspci -vv
[...]
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
        Subsystem: Fujitsu Limited. Device 137a
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 16
        Region 0: Memory at f0300000 (32-bit, non-prefetchable) [size=512K]
        Region 1: I/O ports at 1800 [size=8]
        Region 2: Memory at e0000000 (32-bit, prefetchable) [size=256M]
        Region 3: Memory at f0400000 (32-bit, non-prefetchable) [size=256K]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: <access denied>
        Kernel driver in use: i915
[...]
-- 
Michal Hocko
L3 team 
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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