linux-kernel - i915: display doesn't get on back after returning from standby in 2.6.27-rc*

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Message-ID: <20101123123234.GA3791@tiehlicka.suse.cz>
Date:	Tue, 23 Nov 2010 13:32:34 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: i915: display doesn't get on back after returning from standby in
 2.6.27-rc*

Hi,
since early 2.6.37 (I haven't bisected when exactly) my screen doesn't
get on after it got into standby mode. I have to either change to a
text console and back (if it gets to standby by the screen saver) or
close the lid on my laptop if I try:
xset dpms force standby

Changing to a text cosole doesn't help in dpms case.

When I boot back to 2.6.36-00022-g2b666ca this works fine.
Is this a known issue?

$ 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
[...]

Nothing appears in the log during dpms standby and the lid close. dmesg
output is attached.
Config is attached as well.

Let me know if you need further information.

Thanks
-- 
Michal Hocko
L3 team 
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic

View attachment "config-2.6.37-rc3" of type "text/plain" (68671 bytes)

View attachment "dmesg-2.6.37-rc3" of type "text/plain" (101938 bytes)