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 <div class="gmail_quote">2010/1/28 ykzhao <<a href="mailto:yakui.zhao@intel.com">yakui.zhao@intel.com</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">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 <div><div></div><div class="h5">> 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 > <<a href="mailto:changsijay@gmail.com">changsijay@gmail.com</a>> </div></div></blockquote></div>