Re: Linux 2.6.37

From: Michal Hocko
Date: Thu Jan 06 2011 - 05:48:22 EST


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
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
Lihovarska 1060/12
190 00 Praha 9
Czech Republic
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