[Intel-gfx] Intel Arrandale IGDNG VGA issue

[CSJ]

Dear ykzhao,

This is dmesg by using kernel 2.6.33-rc5 and the screen is black but
external monitor is OK.

[    9.558076] Linux agpgart interface v0.103
[    9.561544] agpgart-intel 0000:00:00.0: Intel Ironlake/M Chipset
[    9.562215] agpgart-intel 0000:00:00.0: detected 32764K stolen memory
[    9.627322] agpgart-intel 0000:00:00.0: AGP aperture is 256M @ 0xb0000000
[    9.638539] [drm] Initialized drm 1.1.0 20060810
[    9.652006] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[    9.652094] i915 0000:00:02.0: setting latency timer to 64
[    9.656600] i915 0000:00:02.0: irq 28 for MSI/MSI-X
[    9.656607] [drm] set up 31M of stolen space
[   10.387980] [drm:intel_crtc_mode_set] *ERROR* Couldn't find PLL settings
for mode!
[   10.387983] [drm:drm_crtc_helper_set_config] *ERROR* failed to set mode
on crtc f69b6800
[   10.395882] Console: switching to colour frame buffer device 210x65
[   10.396684] [drm:intel_crtc_mode_set] *ERROR* Couldn't find PLL settings
for mode!
[   10.396686] [drm:drm_crtc_helper_set_config] *ERROR* failed to set mode
on crtc f69b6800
[   10.405432] fb0: inteldrmfb frame buffer device
[   10.405469] registered panic notifier
[   10.412285] acpi device:01: registered as cooling_device4
[   10.412974] input: Video Bus as /class/input/input6
[   10.413114] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post:
no)
[   10.420361] acpi device:13: registered as cooling_device5
[   10.425291] acpi device:14: registered as cooling_device6
[   10.425667] input: Video Bus as /class/input/input7
[   10.425822] ACPI: Video Device [VGA1] (multi-head: yes  rom: no  post:
no)
[   10.425956] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on
minor 0




2010/1/28 ykzhao <yakui.zhao at intel.com>

> On Thu, 2010-01-28 at 12:18 +0800, CSJ wrote:
> > Hello,
> >
>
> Hi,
>        Do you have an opportunity to try the 2.6.33-rc5 kernel and see
> whether
> the issue still exists?
>
> Thanks.
>        Yakui
> > I got an issue on Intel Core i5 M540 with LG panel (Max resolution is
> > 1920x1080).
> > That screen is fuzzy on the right area on Ubuntu as attached picture.
> >
> > And after checking, the root cause is PLL setting in the Intel native
> > driver.
> > (drivers/gpu/drm/i915/intel_display.c)
> >
> > in intel_igdng_find_best_PLL function, it goes to red lines,
> >
> >                                                 continue;
> >                                         this_err = abs((10000 -
> > (target*10000/clock.dot)));
> >                                         if (this_err < err_most) {
> >                                                 *best_clock = clock;
> >                                                 /* found on first
> > matching */
> >                                                 goto out;
> >                                         } else if (this_err < err_min)
> > {
> >                                                 *best_clock = clock;
> >                                                 err_min = this_err;
> >
> > and the clock settings before function return are:
> >         clock.n=6
> >         clock.m1=11
> >         clock.m2=4
> >         clock.p1=0
> >         clock.p2=7
> >         clock.dot=188571
> >         clock.vco=1320000
> >         clock.m=77
> >         clock.p=7
> > the kernel version is 2.6.32.6 .
> >
> > It will become terrible if I modify the clock setting
> > manually(forcellu) to the values that
> > from the the other machine with same chips but CMO panel (the screen
> > is normal).
> > (the CMO screen max resolution is 1600x900)
> >
> > Is there any suggestion to tune the clock settings?
> > thanks a lot :)
> >
> > CSJ
> > <changsijay at gmail.com>
>
>
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