Re: Linux 2.6.37-rc8

[Jeff Chua]

On Wed, Dec 29, 2010 at 9:18 AM, Linus Torvalds 
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> The -rc8 release shouldn't be all that exciting. The most noticeable
> is probably the fact that hopefully the "blank screen" problem with
> intel graphics is fixed. But on the whole, it's all just a collection
> of random fixes all over.

> Chris Wilson (5):
>      drm/i915/bios: Reverse order of 100/120 Mhz SSC clocks


For some reason, this does not work on my Lenovo X201s. Reverting the 
commit solves the "blank screen" problem.


# lspci -v
00:02.0 0300: 8086:0046 (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Core Processor 
Integrated Graphics Controller (rev 02) (prog-if 00 [VGA controller])
        Subsystem: Lenovo Device 215a
        Flags: bus master, fast devsel, latency 0, IRQ 42
        Memory at f2000000 (64-bit, non-prefetchable) [size=4M]
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 1800 [size=8]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [a4] PCI Advanced Features
        Kernel driver in use: i915
        Kernel modules: i915


# dmesg
[drm] Initialized drm 1.1.0 20060810
i915 0000:00:02.0: power state changed by ACPI to D0
i915 0000:00:02.0: power state changed by ACPI to D0
i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
i915 0000:00:02.0: setting latency timer to 64
i915 0000:00:02.0: irq 42 for MSI/MSI-X
vgaarb: device changed decodes: 
PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
Console: switching to colour frame buffer device 180x56
fb0: inteldrmfb frame buffer device
drm: registered panic notifier
acpi device:02: registered as cooling_device4
input: Video Bus as 
/devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:00/input/input7
ACPI: Video Device [VID] (multi-head: yes  rom: no  post: no)
[drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0



commit 448f53a1ede54eb854d036abf54573281412d650
Author: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Date:   Tue Dec 14 20:06:20 2010 +0000

    drm/i915/bios: Reverse order of 100/120 Mhz SSC clocks

    Fixes the lack of output on the LVDS panel of the Lenovo U160.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=31596
    Reported-and-tested-by: Dirk Gouders <gouders@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
    Cc: stable@xxxxxxxxxx
    Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>

diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index b0b1200..2b20786 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -270,7 +270,7 @@ parse_general_features(struct drm_i915_private *dev_priv,
 					general->ssc_freq ? 66 : 48;
 			else if (IS_GEN5(dev) || IS_GEN6(dev))
 				dev_priv->lvds_ssc_freq =
-					general->ssc_freq ? 100 : 120;
+					general->ssc_freq ? 120 : 100;
 			else
 				dev_priv->lvds_ssc_freq =
 					general->ssc_freq ? 100 : 96;



Thanks,
Jeff

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