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    SubjectRe: Linux 2.6.37
    [Let's CC Indan - author of the bugzilla patches]

    On Thu 06-01-11 11:48:16, Michal Hocko wrote:
    > 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

    I can confirm that this problem is not present if both patches from
    bko#22672 are applied on top of 2.6.37 kernel.
    I haven't tried both patches separately, but I can surely try it if it
    makes any sense.

    >
    > $ 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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